Showing posts with label car stereo. Show all posts
Showing posts with label car stereo. Show all posts

Thursday, October 16, 2014

Rockford Fosgate Power 1000 Mosfet Amp Dyno Test 2 Ohms Bridged Dynamic IHF-202 Certified

Rockford Fosgate Power 1000 Mosfet


Those who know car audio from the 80's and 90's know the Rockford Fosgate Power 1000 Mosfet. A beast of a four-channel amp, costing close to $3000. The model shown above is a later generation "Terminator Edition". First gen models were 6" longer with a caboose to help hide the wiring and they also had no LED meter like the later "Terminator Edition" and 1000c models. Understand, not all chrome Power 1000's with LED's are Terminator Editions. Internally, they appear to be the same amp, yet Rockford Fosgate gave appreciation to Wayne Harris' design of the shortened 1000 with the LED meters and made a limited run of Terminator Editions. Read the earlier article about this amp here.


While working on the full Amp Dyno test of the Power 1000, I thought the results were interesting enough to post a short video showing the 2 ohm bridged output using the Dynamic RMS Power mode. This mode adheres to the IHF-202 standard for testing dynamic power



Watch the video in full 1080P HD Here >>

Or embedded below:


More Amp Dyno AD-1 tests coming!

Make sure you are subscribed to my channel so you'll receive notifications when I upload the next exciting video! Thanks for your support and remember to keep it Old School!


Subscribe to my channel: http://www.youtube.com/BigDWiz
Visit My Website: http://www.oldschoolstereo.com
Follow me on Twitter: http://www.twitter.com/oldschoolstereo
See us on Facebook: http://www.facebook.com/oldschoolstereo

Check out these other cool car audio channels:
http://www.youtube.com/CarAudioFabrication
http://www.youtube.com/meade916
http://www.youtube.com/SoundManCarAudio
http://www.youtube.com/DAmoreEngineering

For further information on Rockford Fosgate equipment, please visit:
http://www.rockfordfosgate.com

Thursday, April 4, 2013

OldSchoolStereo News and 8" Old School Subwoofer Demos




OldSchoolStereo fans and followers...my apologies for the delay in posting new articles. I've been extremely busy with my day job and family the past few months. I just wanted to let everyone know I'm still an excited and enthusiastic member of the old school car audio scene and hope to be back with lots of more content soon. I'm just trying to set expectations that the articles and videos may not come as often as they have in the past for many more months. I truly hope you guys will stick with me and be patient as I have some big things planned for the future.

Oh yeah, I almost forgot to post some recent acquisitions...see below, and also enjoy my recent videos.

Early 90's Rockford Fosgate Power 1000c Mosfet and Kicker F12-4 Subwoofers


See the recent old school 8" subwoofer demo's below!


Watch the video on YouTube in 1080P or embedded below:

Rockford Fosgate Punch SP-88 8" Subwoofer Demo:



MTX Blue Thunder 8" Sub BTW-834 Demo:





JL Audio 8W1 Old School 8" Subwoofer Demo:



More coming in the near future...stay tuned!


Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo. Also be sure to like us on Facebook.  Keep it Old School!!

-BigDWiz



Saturday, December 8, 2012

Amazing Car Audio Museum in Germany

It has sort of been a dream of mine to put my old school equipment into a showcase, sort of a museum. Unfortunately, I don't currently have a good room to showcase my gear, but maybe one day. In the meantime, check out this guy "Danny" in Germany and his awesome collection of old school car audio and an incredible display of it all. I'd call this the ultimate man cave! Although some of the text is in German, all of the pictures are in English ;-)

http://www.carhifi-magazin.de/ch_blog/?p=723

Keep it old school, more goodies on the horizon!

-BigDWiz

Saturday, July 21, 2012

Possibly the Ultimate 50 Watt Cheater Amp from the 90's?

Yes, I know, if you guys watch my YouTube videos, then you've probably seen the Lanzar Opti 50c. But wait, is it possible another "50 watt" amp may give the Lanzar a challenge for king of the 25x2 amps? Well, yes, specifically the U.S. Amps VLX-50. I recently came across a near MINT 1996 model in the "Mirror Polish" finish which looks nearly chrome. See the pics below:


1996-1998 U.S. Amps VLX-50 Ultra-High Current Cheater Amp


The VLX-50 has the following ratings:


2 x 25W at 4 ohms (12V)
2 x 31W at 4 ohms (14.4V)
2 x 62W at 2 ohms (14.4V)
2 x 125W at 1 ohm (14.4V)
2 x 250W at 0.5ohm (14.4V)
2 x 500W at 0.25ohm (14.4V)
1 x 1000W at 0.5 ohm bridged (14.4V)
THD: less than 0.006%
External 120A Fuse Required


VLX-50 Inputs and "Vari-Loud" controls




The U.S. Amps logo is laser etched on the heatsink and it surprisingly took me several days to prove this was actually a VLX-50. For some reason, U.S. Amps didn't put any markings on the end plates or even on the circuit board indicating the model of some of their amps (this one included). I was able to get confirmation from U.S. Amps this was indeed a VLX-50, based on the serial number. I even posted a thread over on DIYMA to get some info and got some great info in the archaeological dig.


So, the best part about having an amp rated at 50 watts total put out 1000 watts is the "cheater" factor. Back in the 90's, you could have two of these and still compete in the 100 watt and under competition class (as they rated amps by their 4 ohm output power). Thus the "cheater" status as you could have up to 2000 watts if these amps were properly loaded down. Orion really started the cheater amp category with the 225 HCCA, which was introduced in the late 1980's. Also, as a response to ultra-cheater amps like the VLX-25 and VLX-50, Orion developed the "1-watt" Concept 97.3 back around 1997. The cheater amp era basically ended around the early 2000's as most manufacturers were competing to see how high they could rate their amps (by using MAX power) instead of underrating amps. Another reason why I prefer the car amplifiers from the 80's and 90's...


VLX-50 Power / Ground / Speaker Terminals




Get ready for the long awaited 25x2 cheater amp shootout. As soon as the temps cool and I complete my additional resistor loads, we'll see how the VLX-50 competes against the monster Lanzar 50c. I don't believe the Orion 225 HCCA, Rockford Power 50x2, MTA 225HO or Audio Art 50HC have a chance against the VLX-50 or 50c, but who knows? We all may be surprised!




See my video overview of the U.S. Amps VLX-50 below.




Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.


Watch the video on YouTube in 1080P or embedded below:








Saturday, June 30, 2012

Old School Car Audio Tribute Video - Submitted

Here we have a great video put together by "MrRubenEsp" on YouTube. The video is a dedication to the old school car audio gear and installs. He mentions finding most of the pictures on the Internet, and I think he did a great job putting together the slideshow. Enjoy the video below!


I've asked before and will continue to remind OldSchoolStereo.com fans...please submit your photos/videos/installs/etc! You can reach me at oldschoolstereo at gmail dot com or via message on YouTube via username BigDWiz

BigDWiz - OldSchoolStereo.com




Saturday, June 2, 2012

Rare Old School Rockford Fosgate Power 1000 Mosfet Terminator Edition Amplifier

est. 1990 Rockford Fosgate Power 1000 Mosfet "Terminator Edition" Amplifier designed by Wayne Harris

Let us take a journey back to the year 1989...Car audio had been around for a while, but with amplifiers such as the HiFonics Colossus, Linear Power 8002 and Rockford Fosgate Power 1000, things were really getting serious. Wayne Harris, one of the pioneers of modern car stereos, was hired by Rockford Corporation and was given the task of swapping out his amps in the "Terminator Hearse" with the Power 1000 Mosfets. Wayne was kind enough to send an email describing the beginnings of the 1000C:


"If I recall correctly, I went to work for Rockford in July of 1989. One of my first tasks was to upgrade the equipment I was using in the Terminator. Rockford gave me 6 each Power 1000 amplifiers. Unfortunately, they were too long to fit in my car. I took the sheet metal for each amp to a machine shop and had them cut off the “caboose”. This made the amp about 6 inches shorter. (Now the amps would fit in my amp rack.) I then designed an LED bargraph meter display and installed these displays within the MAIN housing of the amplifiers. The final step was to chrome plate the amp shroud and then apply custom silkscreen.

The VP of marketing (Jerry Cave) saw the amps in my car prior to the 1990 CES show in Las Vegas. He like the amps in my car so much that he decided to make all Power 1000 amps look the same."

As many of you old schooler's know, Wayne Harris' Terminator Hearse is a legend in car audio. If you haven't seen it, take the time to view the video of this beast from 1985 from dBDragUSA's YouTube channel...can you say 30" subwoofer?

Sorry for the side track, I'll try to stay on subject here. The Rockford Fosgate Power 1000 Mosfet "Terminator Edition" (from now on we'll refer to as the 1000C) was a step forward in design from the original Power 1000 Mosfet, which was introduced around 1987. The internals were identical except for the LED meter and removal of the "caboose". The 1000C's chrome appearance and $2650 US MSRP meant this amp was not for your average 16 year old getting a new stereo....it was for serious competitors and those who got had the means to buy such an expensive amplifier. Many Rockford dealers had one or more of these amps in their demo vehicles and most of us could only dream of owning such an amp.


RF T1000 vs. Orion Concept 97.3

The 1000C is a four-channel, class A/B amplifier with no internal crossovers. See detailed specs below:

  • Power Ratings 2 Channels (Bridged): 500 watts x 2 channels from 20-20,000Hz with less than 0.1% THD
  • Power Ratings 4 Channels4 Ohms: 150 watts x 4 channels from 20-20,000Hz with less than 0.05% THD; 2 Ohms: 250 watts x 4 channels from 20-20,000Hz with less than 0.1% THD
  • Frequency Response: 20-100,000Hz +0.5dB, -3.0dB
  • Damping Factor: At circuit board: Over 200 (referred to 4 ohms); At speaker fuse: Over 50 (referred to 4 ohms)
  • Signal to Noise Ratio: Over 80dB Unweighted
  • Instantaneous Peak Output Current: Over 100 Amperers 
  • Protection: The Power 1000 is protected by analog computer output protection circuitry and a 100A fuse. A thermal sensor shuts down the amplifier in case of overheating
  • Dimensions: 22.75" L x 7.4" W x 3.75" H
  • Weight: 21lbs
  • MSRP: $2650 US (1991)


Here is an informational email I received directly from Rockford Fosgate when I inquired about the 1000c Terminator Edition amp:



“The T1000’s went from the black painted and silkscreened ones with the caboose (that covered the 6ga B+ & Gnd terminal block), then to the black painted and silkscreened ones that no longer had the caboose and just had the one B+ and two GND cables hanging out of it.  Then it migrated into a chrome fan shroud.  That’s about the time that Wayne Harris came on board with designing the LED output meter for the T1000’s.  Then probably in ’92-’93* is when the Terminator Edition hit the market with the special screening and LED display.  It was a very limited run….I think maybe only 100pcs or so.  I think Wayne had 10 of them for himself.”

(* I think the year range was '90-91 - BigDWiz)




See the unboxing and overview video below. More information coming as soon as I get the amp repaired and fully functional...

Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.


Watch the video on YouTube in 1080P or embedded below:




Saturday, March 17, 2012

1990 MTX Terminator MTA 250 Amplifier - PPI Built Cheater

MTX Terminator MTA 250 100 Watt Car Audio Amplifier

Following the theme of the recent posting of the Dragster DH 1804, I guess I have a thing for bright red amplifiers. The MTX Terminator MTA 250 is the most recent addition to the OldSchoolStereo.com collection and an impressive one indeed. The MTA 250 is one of MTX's first car audio amplifiers and was actually made by PPI (Precision Power). The MTA 250 closely resembles the PPI ProMOS 2050 and even uses the hated and nearly impossible to find replacement PPI speaker harness.

The MTA series of amps from MTX included two models; the MTA 225 and the MTA 250. Both models were stable down to 1 ohm and followed suit to the Orion HCCA's as "cheater" amplifiers for competition use. The 225 retailed for $500 US while the 250 was going for $650. In addition to the stunning red heat sink, MTX offered both models in white.

MTX MTA 250 Gain, Inputs, Max Thump, and LED's for Power and R/L clip

During the late 80's and early 90's, having a cheater amp was very important for competition purposes. There were several classes including under 50, 100, 150 and 250 watts. The higher wattage classes were ultra competitive, so those new to the scene and/or those on a budget would steer to the lower wattage classes. Cheater amps like the Orion HCCA's, PPI ProMOS, Phoenix Gold MPS and others were popular among competitors. The cheater amps could produce four times (or more) their rated 4 ohm power into lower ohm loads.

At the time MTX released the MTA series amps, they also introduced a Terminator line of subwoofers. They had a red cone and touted "2 ohm" resistance for maximum power output from your amp. A perfect match to the MTA series amps and their high-current, low-ohm output rating....marketing genius!

Here are the specs of the MTA 250 from MTX:

RMS Output:


  • 4ohms Stereo: 50 W per channel
  • 2ohms Stereo: 100 W per channel
  • 1ohm Stereo: 200 W per channel
  • 4ohms Mono: 200 W
  • 2ohms Stereo: 400 W
Total Harmonic Distortion (THD): 0.02%
Frequency Response (+/- 1dB): 15-40kHz
Signal to Noise Ratio: 102dB A weighted
Slew Rate: 15V/us
Damping Factor @ 100Hz 4ohm load: >500
Damping Factor @ 100Hz 2ohm load: >250
Stereo Separation: 72dB
Input Sensitivity: 100mv - 2V
Input Impedance: 10k Ohms
Supply Voltage: 10.5-16V
Fuse Rating: 30 Amp
Shipping Weight: 12 Pounds
Dimensions: 14" L x 8.5" W x 2.3" H


Internal Bridging for Mono or Mixed-Mono Applications
MOSFET Power Supply and complementary discrete output circuitry
Two-layer glass epoxy computer grade circuit board
Low-Noise, sealed conductive plastic potentiometer
Designed and built in the USA

MTX MTA 250 "Gut" shot - Circuit Board

See video demo below!


Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.


Watch the video on YouTube in 1080P HD or embedded below:

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Friday, March 9, 2012

Dragster DH 1804 1.2kW Car Audio Amplifier

Dragster DH 1804 1.2kW Amp vs. Orion XTR 2250 "The Beast"


I recently picked up an Italian made amplifier from Dragster, called the "DH 1804" or "1.2kW" amplifier. This amp is a 4 channel model rated at 180 watts x 4 channels at 4 ohms and 300 watts x 4 channels at 2 ohms or bridged at 600 watts x 2 (giving you the 1,200 or 1.2kW of power). Dragster also offered a 2 channel version of the amp, called the DH 1802. Ratings are 360 watts x 2 at 4 ohms, 600 x 2 at 2 ohms or 1200 watts bridged at 4 ohms.

As you can see by the comparison above, the DH 1804 makes the Orion "Beast" look not so beastly...The Dragster is about 5 inches longer and 3 inches wider than the Orion. All connections are made via terminal strips and there are dual connections for power/ground. The DH 1804 is beautifully constructed of aluminum and partly chrome plated and partly powder-coated a bright, candy red.

Unfortunately for me, the seller I purchased the amp from shipped it with virtually NO packing material. The amp took a beating during transit, had the mounting tabs and a few fins bent. Needless to say, I was NOT a happy camper! Anyone who sells a car amp listen....pack an amp VERY carefully when shipping. If you haven't worked at UPS or FedEx (or any other shipping/receiving company) unloading and loading trucks, you have no idea how much the package goes through before it's delivered to the destination.

Continuing with the amp itself, there is very little information available online about this 1.2kW amp. A quick "all language" search with Google helps as this amp appears to be very popular outside of the USA. Since it was made in Italy, I can only think of well-made exotic cars such as Ferrari and Lamborghini. Thanks to Google Translate, I was able to retrieve the following specifications:

The Dragster brand from Italy is known for very good sounding amps. Excellent workmanship combined with a stylish design are just a figurehead of this high-end manufacturer, this power comes in all walks of life up to the top model DH 1804, with impressive values.

PWM MOSFET power supplies
Variable Crossovers
RedRubin aluminum heat sink
High-quality epoxy circuit boards
2 ohm stable stereo
Sealed potentiometers
Teflon-plated RCA connectors
High Speed ​​HEXFET audio outputs

4 x 180 / 300 watts RMS at 4 / 2 Ohms
2 x 600 watts RMS into 4 ohms
variable 50-500Hz HP / LP filter for Front & Rear
Distortion 0.05% Signal-to> 103 dB

Dimensions: 740 x 55 x 245 mm




Dragster DH 1804 vs. HiFonics Zeus VII


Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.

Dragster Demo Vehicle equipped with DH 1804 Amplifier



See the video on YouTube in 1080p HD or embedded below:



Sunday, February 19, 2012

Old School Polk Audio C4 Subwoofer - Fourth Order Bandpass Enclosure

Polk Audio C4 Subwoofer - Fourth Order Bandpass Enclosure with Four 6x9 Subwoofers in Isobaric Configuration

Wow, a true survivor here! An early 90's Polk Audio C4 subwoofer. This enclosure is one of the most unique factory car audio subwoofers of all time. It uses four 6x9 subwoofers mounted in a compound isobaric configuration. The center chamber is sealed, while both outer chambers are vented with a 3" x 5" port. Dual binding posts offer either 4 ohm stereo, 8 ohm mono or 2 ohm mono configuration.

Here are the technical specs provided by Polk:

Driver complement - Four 6x9 drivers monted in a isobaric push pull configuration
Enclosure type - 4th order bandpass
Frequency response - 25 to 150 Hertz
Sensitivity - 94 db @ 1 Watt @ 1 Meter
Recommended amplification - 25 to 200 Watts per channel
Impedance - 4 Ohm stereo, 2 or 8 Ohm mono
Dimensions - 8" H x 26.25" W x 17.125 D
Weight - 26 pounds





Bottom Panel of C4 Removed


Now, looking cool is nice, but sound quality and bass output is what's really important. After reviewing some  of the magazines in the OldSchoolStereo library, I found a test of this subwoofer by Car Stereo Review (March/April 1992). Since I don't have the equipment to compile technical measurements of speakers, I was intrigued to see the reviewer was able to get 119dB out of this unit. I've been using a JL Audio 12w6v2 for the past few weeks and although I haven't had my system measured, I feel pretty confident I'm pushing 125dB with only 300w. I guess what I'm alluding to is right off the bat, I wasn't expecting to obtain the output I'd become accustomed to over the past few weeks. However, I have been using a single Kicker Solobaric s10c the past year or so and it has been sufficient for my tastes so the C4 may be enough for my needs.

Now, I've only tested out the C4 for an hour or so total, so I won't leave my final impression until I've been able to give it a few weeks in my car. For now, I'll just say my initial impression is the C4 is quite impressive. It won't flex your windows or take your breathe away, but it will provide clean, hard-hitting, dynamic bass good enough for those looking to add some low end to their modest systems. I'll update the article in a few weeks with my overall impression. I've posted the video overview including demo below. Enjoy!


Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.


See the video on YouTube in 1080p HD or embedded below:




Tuesday, January 24, 2012

The Vintage Rockford Fosgate Collection of OldSchoolStereo.com

Some of the Older Fosgate and Rockford Fosgate Amps in the OldSchoolStereo collection

We at OldSchoolStereo.com are Rockford Fosgate fanatics! I myself, started off with a late 80's Punch 45 and still have the amp to this day (and it still works great!). I decided to put together a video slideshow of much of our old school collection of Fosgate and Rockford Fosgate gear.

The slideshow was put together to show off models ranging from a 1978 PR-250 to the 2005 "25 To Life" Anniversary models of the Punch 45, 75 and 150. Enjoy the slideshow showing off models such as:


  • Fosgate (Pre-Rockford) Amps including the PR-220 and PR-250
  • 1st Generation Punch 45, 75, 150 and several Perfect Interface chrome and gold amp shrouds
  • 2nd Generation and HD series Punch 45, 75 and 150
  • Old School Power series amps including the Power 100HD, Power 300, Power 360, Power 650 and Power 1000 Mosfet model
  • A MASSIVE collection of the 1992-1996 DSM series amps including; Punch 40, 60, 100, 200 (plus the ix models) and a few of the 4 channel models; 4020, 160x4 and 400x4. I also show off a MINT Punch Power 500M in the original box!
  • Speakers including the "Punch Classic" subwoofers and AUDIOphile mids/tweets and subs from the mid-1990's
  • And MUCH more! Enjoy the 5 minute video!
I also created both music tracks on my iPad using GarageBand. I'm no expert making music, but have fun doing it. Let me know what you think of my beats and such.

Rockford Fosgate DSM Heaven!



Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.



See the video on YouTube in 1080p HD or embedded below:

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Sunday, January 1, 2012

Alpine 7288 Cassette Radio/CD Changer Controller - Vintage, Old School!


Alpine 7288 Cassette Radio / CD Changer Controller - Pull Out, same Era as 7909

Take a journey back to 1989 with this Alpine 7288 Cassette Radio / CD Changer Controller with Pull Out functionality for security. This was not Alpine's top of the line unit, but at $500US MSRP, it was still a very pricey tape deck. The 7289 was Alpine's most expensive Cassette Radio at the time, $550 (with internal amplification), while the 7390 was the top end Cassette Tuner (no built-in amp) and would set you back a mere $600US. These high-end Alpine head units could control the 5952 and 5959 CD Changers.

So, why would one pay $500 for a Cassette Radio when the Alpine 7904 CD Tuner could be obtained for the same price? Well, you must recall, at the time (1989/1990), most people had cassette collections, but only a few CD's. Alpine was betting most people would opt for a nice cassette radio up front, then add a CD Changer when the funds became available. The 5952 CD Changer was a mere $650, so adding one was a big purchase for most folks. Now, if you had mad cash, you could just trash your cassettes, buy an Alpine 7909 CD Tuner for $1200, then add a 5952 CD Changer for many hours of listening pleasure!

Ok, sorry, back to reality. We are talking about the 7288 Cassette Radio, so I'll try to stay on topic. Let's see some of the technical specifications of the 7288:


  • MSRP: $500US
  • Pull-Out for security
  • 4 RCA Pre-Amp Outputs for adding external amplifiers
  • 16W + 16W Built-in amplifier
  • GR Full Lock Tape Mechanism
  • Auto Reverse
  • Tape Frequency Response: 20Hz-20kHz
  • Dolby B Noise Reduction
  • CD Changer Controller
  • 12FM and 6AM Radio Presets
  • Dimensions: 7in x 2in x 6in



Click HERE to See FULL Size picture

I recently picked up a MINT Alpine 7288 and thought it was important to write an article and create a demo video showing off the unit. Click HERE to see the full specifications.

Although I was able to test the unit for functionality, I did not do a full test. The tape mechanism sounded rather loud to me, it may have always been this way, but I didn't want to stress it out. It most likely needs a new belt for the tape drive, but I don't know for sure. I was extremely impressed all features appeared to work properly and the FM tuner was working even without an antenna plugged in...now that's a sensitive tuner!! Unfortunately, I didn't have a 5952 or 5959 CD Changer to test out the controller functionality, but hopefully I'll come across one soon.

See more up close and personal pictures below:

Alpine 7288 Left Front Side


Alpine 7288 Front Right Side - Classic "chicklets"

As you can see in the pictures, the display is bright and clear. The buttons show very little wear, even less than my near mint Alpine 7903 CD Tuner. I used a soft brush to remove the dust, you may be able to see I missed some....dang those DSLR's!

One last picture I'll show before the video is the DIN plug and RCA Pre-Amp outputs. See below:


Alpine 7288's DIN Plug for CD Changer and RCA Output Jacks

Alright, so we all know a picture is worth 1000 words, so how much is a video worth? Well, for me, it all depends on the quality. The video below was captured in 1080/24P using my Canon 7D. I was planning on recording audio using an external device, but decided the internal mic would suffice for the tape sounds and output sounds. As I note in the video, I was using a small 4" dual-cone speaker, so don't expect any impressive sounds from the Tuner and Tape playback tests. Enjoy the video!


Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.



See the video on YouTube in 720p HD or embedded below:





Tuesday, December 13, 2011

Rockford Fosgate Power 650 Mosfet - True Old School Powerhouse

Late 80's Rockford Fosgate Power 650 Mosfet

Think old school power....think names like Orion, Precision Power and Rockford Fosgate. Up for review today is a late 80's Rockford Fosgate Power 650 Mosfet. This amp is an icon of the infamous Mosfet Power series by Rockford. People know the Power 300 as the "entry level" power series amp (MSRP $999*) and the "ultimate" power series as the Power 1000 Mosfet (MSRP $2650*). But why no respect for the big brother, Power 650? It's always tough to be the middle child! The Power 650 retailed for $1575* in 1990 and was available from approximately 1985-1993.

(*Pricing above was verified in an April 1990 Car Audio & Electronics Car Stereo Directory)


Here are the specs of the Power 650 Mosfet:

  • Power Ratings: 4 Channel
    • 4 Ohms: 125 watts per channel continuous power into 4 Ohms, 4 channels driven, from 20 to 20,000Hz, with less than 0.05% THD + N (Total Harmonic Distortion & Noise).
    • 2 Ohms: 162.5 watts per channel continuous power into 2 Ohms, 4 channels driven, from 20 to 20,000Hz, with less than 0.1% THD + N.
  • Power Ratings: 2 Channel (bridged) 4 Ohms: 325 watts per channel continuous power into 4 Ohms, 2 channels driven, from 20 to 20,000Hz, with less than 0.05% THD + N.
  • Frequency Response: 20 to 20,000Hz, ± .5dB
  • Bandwidth: 15 to 20,000Hz, ± 3dB.
  • Damping Factor: greater than 200 at 50Hz.
  • Slew Factor: greater than 2.5.
  • Slew Rate: greater than 10 volts per microsecond.
  • Protection: The Punch also employs thermal switches which protect the amplifier from overheating damage. Fuses are provided for speakers which are directly connected with no crossover components.
  • Dimensions: 18 3/10” long x 8 1/10” wide x 2” high, exclusive of knobs and wiring. 19 3/10” long x 8 1/10” wide x 2%” high, minimum mounting requirements.



Disassembled Power 650 Mosfet - Fan Shroud, Amp "guts", bottom plate and fuse cover

You young kids out there don't know much about Class A/B subwoofer amps with the $300 1500-watt Class D amps you have today. The Power 650 and Power 1000 were classic subwoofer amps in their day. Instead of using DVC subs with "fat" surrounds, we had 15's, 18's and even 30" subs (See Wayne Harris' 1985 Terminator Hearse)!!! No mention these old school subs in many cases were 8 ohms, used in multiples and had an x-max of 10 or 12mm if you were lucky...We still appreciate the "Made in the USA" quality of these amps and the pride the workers put in each and every amp. Shoot, the Rockford amps were even smacked with a rubber mallet to ensure they could handle the "punch" as part of their QA process!

One feature lacking on the Power 650 you would find on the Power 300 was bass and treble controls. For the most part, if you could afford a Power 650, you could most likely also afford a matching "Z or ZX" preamp. These preamps had EQ adjustments and even fancy LED lights as a VU meter.


Bottom side of the Rockford Fosgate Power 650 Mosfet

In addition to being a powerful four-channel amplifier, the Power 650 is also a very flexible amp. In the mid to late 1980's there were only a handful of amplifiers with built in crossovers...the Power 650 being one. Unlike modern amps, the crossover settings are set at certain frequencies (instead of being fully-variable). Also, note the high crossover's cutoff begins at 140Hz, whereas the low pass could be set as low as 70Hz. It could be used in four, three or two channel operation. My initial RMS wattage tests have shown the Power 650 ratings to be conservative, more on this in an upcoming video and article.


Early Rockford Fosgate Power 650 Mosfet with DIN and RCA Inputs

Those familiar with the Power 650's know in addition to there being DIN/RCA and RCA only models, there was also a short run of the last Power 650's with a 4-inch fan as opposed to the 2-inch model available since the mid-1980's. From my research, the 4-inch models were the last production Power 650 mosfets and were produced in low numbers. See pictures and some more detail here: http://www.gamblin.net/power650.html



Stay tuned for the RMS wattage output demo of the Rockford Fosgate Power 650 Mosfet. Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.


See the video on YouTube in 720p HD or embedded below:

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See the Old School Rockford Fosgate Power 650's in ACTION! Wayne Harris' "Terminator" Hearse Vintage 1985

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Friday, November 18, 2011

SMD's DD-1 - New School Tool for Old School Amp Testing


SMD's DD-1 "Distortion Detector" vs. Velleman HPS50 Oscilloscope

Many of you who follow my blog and videos, know I've had a Velleman HPS50 oscilloscope for a while now and keep adding components to enhance the capabilities of my test bench. My primary focus now is testing amplifiers for maximum continuous RMS wattage output. We all know most of the ratings we see on amps today are not RMS, but MAX output. This is a marketing ploy, not useful at all in determining the actual output of an amplifier. I'll soon get one of these amps on the bench and show you actual RMS wattage output vs. the value claimed on the amp. You may be amazed and not laugh so much at the old school amps and their low wattage ratings...

I recently decided to pick up a SMD DD-1 "Distortion Detector". This device was developed by the brains at D'Amore Engineering in conjunction with the KING of car audio on the Internet, Steve Meade (www.stevemeadedesigns.com). Steve Meade (meade916 on YouTube) is famous for his 30,000 watt custom Chevy Tahoe and has several hundred videos. Steve is also the largest car audio channel on Youtube with over 100,000 subscribers and over 100 MILLION video views. Impressive to say the least, but this DD-1 is not hype, it is a truly powerful and affordable tool for everyone from electronics enthusiasts to car audio shop installers and many in between.

So, what's the deal with this DD-1 and why might you want one? The SMD DD-1 is marketed as an amplifier gain matching tool. Matching your car audio head unit and amplifier has been a black art for many years. Without an oscilloscope and test tone, setting gains was really just a guess for most folks. The DD-1 costs only a fraction of most oscilloscopes and offers simplicity in setting/matching gains for your car audio equipment.

Here's what's included in the package:

  • The Distortion Detector (DD-1)
  • Protective silicon rubber boot
  • Calibrated Test Tone CD
  • Harness
  • Printed owner's manual


According to the manual, the DD-1 has the following specs:

  • The DD-1's circuitry is 100% analog
  • Distortion Detection trigger level > 1.0% Harmonic Distortion
  • Guaranteed operating range of input signal is 1.2Vrms - 125Vrms (15,000 Watts at 1 ohm) Autoranging
  • Signal Present LED trigger voltage 750mVrms
  • Low Battery LED trigger battery voltage < 5.6Vdc
  • Auto shut-off timer 8-10 minutes after on button is pressed

Now, I must be honest. The unit's ability to match gains is a great feature, but I've had this ability with my Velleman HPS50 portable o'scope for a while. A recent video on Steve's channel about the upcoming AD-1 "amp dyno" got the wheels spinning in my old school head. This DD-1 can be used for more than just matching gains...it can be used to assist in amplifier output testing! This feature in a sub $200 device is unheard of. A bench version of a THD analyzer can cost MANY thousands of dollars. I've been watching eBay for a year or more hoping to find a deal on one of these THD analyzers so I could verify distortion during my amplifier tests. After seeing the AD-1 demo, I was convinced to buy the DD-1 to use as a tool in my RMS output tests.

The DD-1 has proved to be an invaluable tool and will ensure accuracy in my amplifier tests. I have MANY old school amps I plan on testing in the upcoming months. The DD-1 will ensure < 1% distortion in my results which is great. As I mentioned above, not only do many manufacturers rate amps by "Max" output, they also sometimes use distortion numbers up to 10% for their ratings. I think it's important to keep the distortion less than 1%, which should be inaudible for most people.

I have done some initial tests with the DD-1 and have been impressed with it's ease of use and ability to detect low levels of distortion. See some videos below and be sure to subscribe to my YouTube channel to stay updated with the latest amplifier and car audio tests and demos.

Buy the DD-1 Direct at wccaraudio.com

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Thursday, November 3, 2011

Recent Arrivals to the OldSchoolStereo.com Labs

I've recently done several unboxings on my YouTube channel. I'll have more articles and tests in the near future, but for now, enjoy the videos!












Sunday, October 16, 2011

Amps that Rumble...Earthquake PA-2040c and PA-2300


Earthquake PA-2040c and PA-2300 Amplifiers from 1995. Photo (c) OldSchoolStereo.com



One of the "sleeper" Car Audio brands back in the mid-90's was Earthquake. Competing against established brands such as Rockford Fosgate, Orion, Precision Power, Soundstream, etc. proved to be a difficult task. Everyone had a favorite brand, but how did the lesser known brands survive? Well, building quality products was one way and another was to test well in the Car Audio magazines. Earthquake accomplished both of these tasks and although never became as popular as the brands listed above, they did create a place for themselves in old school car audio history!

I recently acquired two Earthquake amplifiers and will briefly overview them below.

First up is the Earthquake PA-2040c. The PA-2040c is a two-channel amplifier with a built-in crossover. The crossover is non-adjustable and either 80Hz low-pass or 200Hz high-pass at 12dB/octave. You could also bypass the crossover to use the amp full range. In addition, the amp also included rotary bass and treble controls at 45Hz and 12kHz. Going by the model number, one might assume the amp is rated at 40w x 2, however specs in the included manual state 52w x 2 @ 4 ohms. I'm still unsure of the "250 watts at 2 ohms" silk-screened on the amp. I don't see any specs referring to this power at 2 ohms? Maybe Earthquake was following lesser brands with "max" output claims? Well, only the bench test for RMS output power will tell us....


Earthquake PA-2040c Amplifier Controls

Earthquake PA-2040c Amplifier Top View

Earthquake PA-2040c Amplifier Speaker Outputs and Power Connections

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Earthquake also produced larger amplifiers, such as the PA-2300. Again, going by the model number, one might assume 2 x 300 watts, right? According to the manual, 2 x 380 watts RMS at 4 ohms and a mind-boggling 1150 watts RMS at 4 ohms bridged. In the mid-90's there were few car audio amplifiers claiming 1000 watts plus. The PA-2300 had no internal crossover, but had a counterpart, the PA-2300c, which did. A rather unusual feature of the PA-2300 was the dual bass controls. One centered at 30Hz and the other at 45Hz. Why two bass controls? I'm not certain, but maybe a tuning choice for those using sealed vs. ported subwoofer enclosures?


Earthquake PA-2300 Amplifier

Earthquake PA-2300 Bass Controls and Inputs


Although these amplifiers look very similar to amps made by Zed Audio (HiFonics VII, VII, Autotek BTS series, Crunch CR series, etc.), Earthquake amps were NOT made by Zed Audio. Although this is the case, rest assured the Earthquake PA series amps were built like a tank. The amps you see above were originally purchased in 1995 and variants of the PA series went back to the early 1990's.

Stay tuned for upcoming power output tests of these amps. Make sure to SUBSCRIBE to my YouTube Channel to stay notified of my latest video uploads.

See the mystery "unboxing" of these Old School Gems below:

Video in 720p HD

or embedded below:



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Sunday, October 9, 2011

Orion 275 SX - Old School 75x2 Powerhouse!


Old School Early to Mid-1990's 75x2 (150 watt) RMS Amps from Rockford, Phoenix Gold, Soundstream and Orion


So, you may have already seen some of my earlier amp output tests on the Rockford Fosgate Punch 150HD vs. Phoenix Gold MS-275 and the Soundstream Reference 300....but what about the Orion 275 SX? Well, wait no longer, my friends. I finally got the Orion 275 SX on the OldSchoolStereo.com test bench for some RMS watt output tests. How do you think it compared to the others? Well, keep reading to find out.

Now, first of all, I think it is important to mention a comparison of the 275 SX....in many ways, it is very similar to the 225 HCCA. Both share the same sized heatsink and require a 35A fuse. I've done some preliminary tests with Orion's 225 HCCA "digital reference" amp a while back and I must say the amp was VERY impressive! The 275 SX is only rated to handle 4 ohm mono or 2 ohm stereo loads. As with many of the old school amps, it can handle lower ohm loads, but not designed to handle the 1/2 ohm loads as the 225 HCCA does without a sweat!

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Orion 275 SX vs. 225 HCCA vs. Messy Test Bench!

Instead of spending so much time comparing the 275 SX to the 225 HCCA, let's move on to the comparison against the other 150 watt amps I've mentioned before. Here are the specs of the 275 SX:

Specs: rated @ 12.5 volts*
2 x 75W @ 4 ohms
2 x 150W @ 2 ohms
1 x 300W @ 4 ohms bridged
THD: 0.03%
S/N: 110dB
Freq. Response: 6Hz 20kHz (±0.5dB)
Fuse: 35A
Dimensions: 11" x 8.5" x 2.25" (28cm x 21.6cm x 5.7cm)

*note: The Orion 275 SX uses an unregulated power supply, so more volts = more power! Also, my power supply is non-adjustable at 13.8v, nearly a volt and a half more than Orion's 12.5v rating, so take this into consideration.

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Orion's 2nd Gen HCCA and SX Spec Sheet / Manual

Ok, enough specs and talk about the amp, let's see how it performed.

Watch the video in 1080p HD

or embedded below:

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Make sure you subscribe to my YouTube channel to stay notified of the latest "old school" car audio videos. Much more exciting tests, demos and information coming up soon...

-BigD


Thursday, September 22, 2011

Unboxing Old School Car Audio Gear

I will be the first to admit, unboxing videos do not appeal to me. Why? Mainly because people do unboxings for things like cameras, camcorders, computers, etc. and there is no excitement factor there. Now, take a plain brown box (with unknown goodies inside), open this up on camera and share your excitement with the world! This is how BigDWiz does unboxings at the OldSchoolStereo labs!


First off, I must say not all of the unboxings I do on my YouTube channel are from purchases. Many are from trades and barters for other gear. This is a part-time gig for me and I don't have unlimited funds to buy all of this cool, old school equipment. Well, since I know opening these packages is exciting for me, I thought you guys might enjoy the experience?


OldSchoolStereo.com Mystery Box!




Finding nice, old school car stereo gear is exciting in itself, but opening a package with unknown contents (well, unknown to you) is fun for all. Those of us who enjoy the old school gear also love to see "timeless classics"...the amps, speakers, head units, etc. that have either been babied or unused all of these years. I still find it amazing to see the condition of some of my 25+ year old equipment.


Most of these videos will just show the unboxing process, but in some cases, I may hook up and test the contents. Honestly, it just depends on how I'm feeling at the current time (and how much space is remaining on my iPhone's internal storage!). This brings up another interesting point....some of you may wonder what equipment I use to record and produce these short videos. Well, I have two words for you; iPhone and iMovie (we won't count "and" as a word!).


Recently, I've discovered making videos with the iPhone 4, is not only a simple process, but also gives a pretty good output video for viewing online. I also ensure use of the included ear buds / mic combination to get better audio, while still leaving both hands free to tear open the boxes. Once I capture the segments on my iPhone 4, basic editing is handled by the iMovie app for the iPhone. This $5 app turns your iPhone into a VERY powerful hand-held editing machine. If there is any interest, I may show the process I use to capture, edit and upload my videos to YouTube. You guys just let me know by making comments here or on my YouTube Channel.


While you are visiting, please Subscribe to my channel so you can get notification when I upload a new video. My intentions are to upload a new video every few days. As I've mentioned before, the more subscribers, comments, likes, etc. I have, the more videos I'll put up. I appreciate your enthusiasm as being an "old school nut" is addictive!


Unboxing Old School Car Stereo Gear
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Unboxing Old School Car Stereo Gear #2
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Unboxing Old School Car Stereo Gear #3
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Unboxing Old School Car Stereo Gear #4


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Thursday, September 15, 2011

Old School PPI Pro Mos Amps - Precision Power!

Most of you old school car audio fans know the early 1990's was a time when aftermarket car audio was getting extremely popular. At this time, it was rare to find a factory CD player and the factory speakers were weak at best in most cases. Manufacturers such as Rockford Fosgate, Linear Power, Precision Power (PPI), Autotek, Orion and Soundstream (to name a few) were some of the very popular aftermarket car audio brands at the time.

The competition between the manufacturers was intense and each one was trying to best the other. Orion's HCCA series amps, released in the late 1980's were extremely popular and had an edge power wise on most other amps with their rating and ability to handle extremely low ohm loads. These low-wattage rated / low ohm handling amps came to be known as "cheater amps". The cheater amps could put out as much as 8x their rated 4 ohm power rating at lower loads. PPI hit the "cheater" market in 1990 with the Pro Mos 2050. Pro Mos was short for Professional Mosfet. This first gen Pro Mos amp was rated to handle loads down to 1ohm and would provide 4x it's rated 4ohm power at 1ohm. Cough up around $800 for a 50x2 amp, and get a 400x1 monster when loaded down. Interestingly enough, Orion's 25x2 "cheater", the 225 HCCA was stable down to 1/2 (some even say 1/4) ohm loads and would put out in excess of 400 watts and cost less than $600.

I've shown a comparison of the Orion 225 HCCA and the PPI Pro Mos 25 in a previous posting and video. You can see my preliminary power output results HERE.

PPI Pro Mos 2050 (top), Pro Mos 12 & Pro Mos 25 - Image (C) OldSchoolStereo.com


These Pro Mos amps were available up until around 1995, adding additional models including the Pro Mos 12, 24 and 50 (replacing the 2050) beginning in 1991. They also released 4 channel models; the Pro Mos 425 and 450. These Pro Mos amps were no frills, offering no internal crossovers or bass/treble controls. They offered a DIN connection for powering a PPI pre-amp or crossover in addition to the standard RCA input jacks. The Power and Ground connections were made via 8 or 10 awg leads and the speaker/remote connection was made by an infamous molex connector. I say infamous because this connector has been a huge failure throughout the years. The wires don't stay inside the connector and the molex connector itself breaks very easily. Many people created terminal strips or soldered the leads to the circuit board.

The Pro Mos amps you see in the photo above are the "art series", finished in white including a unique design by an artist. These amps were also available in black with red lettering.

See the video demo below:

Also, visit YouTube and subscribe to my channel for more exciting OLD SCHOOL car audio gear!

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