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:





Friday, December 30, 2011

Santa Visited OldSchoolStereo - More Old School Goodies!

Yes, it's true...Santa dropped off some Old School Car Audio for everyone to enjoy!


First up is the Rockford Fosgate PBR300x4 "boosted rail" amp to match the PBR300x1 I already have and have tested in a previous video. The 300x4 is a 4 channel amp rated at 75 watts for each of the 4 channels and is not bridgeable. It is the same TINY size as the 300x1 and will work great for a stealth install. More details coming soon on this...

Next up is a rare Infinity Nucleus KPX-2 tri-mode crossover system. This item also came with the optional FC-1 fader control for Front/Rear control. Take an old school 2 channel amp and power an entire system with mids/highs up front, mids/highs in the rear and a subwoofer. The Nucleus KPX-2 offers a 12dB low pass crossover slope at 75hz and a 6dB high pass filter at 150hz.

Last, but not least is a Soundstream Dealer's manual from the mid 90's called the "Heavyweight Boxing" Subwoofer Enclosure design installation manual. It is an extremely detailed with specs of the Soundstream subs of the time (SSR, Granite and SPL models). This extra large manual was for Soundstream dealers and had an original MSRP of $249 and even has a serial number!

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






See 3 of the latest items arriving at the OldSchoolStereo.com Labs. I show off two subwoofers and an ultra-rare NIB set of Boston Acoustics 767 coaxials.

First, you'll see an early 90's Rockford Fosgate PCH-812 "The Punch" Classic 12" 8 ohm subwoofer in MINT condition. Next up is an ultra-beefy 10" sub from Eclipse, the 8810.6. This is a single 6 ohm subwoofer made by TC Sounds. 600 watts RMS, 3" peak to peak excursion and an original retail price of $370 make this a desirable sub, especially in it's very good condition!

Last up is the unbelievable...a BNIB set of Boston Acoustics 767 6.5" coaxials. Per Boston's website, these were made between 1987 and 1993. So, these speakers have been sitting in the box, untouched for possibly over 20 years? Simply amazing!

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





See my latest amp arriving at the OldSchoolStereo.com labs....a MINT Rockford Fosgate Power 500m amplifier, in the box complete with birthsheet! According to an April 1995 Car Audio & Electronics Directory, the 500m retailed for $929 back in 1995. This amp and the 250m2 were Rockford's most expensive amps as the infamous 4 channel Power 300, 650 and 1000 had been retired from Rockford's lineup around 1993 or 1994.

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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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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Sunday, December 4, 2011

700 Watt Mini Amp? Lepai LP-V3 Tested and Reviewed

Lepai LP-V3 Mini Amp

The Chinese Mini Amp Invasion continues!! Next up is the Lepai LP-V3. This mini amp touts use of a BOSE power IC. In fact, the non-grammar corrected text "This Amplifier is use BOSE Power IC" is silk-screened on the amp. You'll also see "700 W Max Music Power" labeled on the amp. The LP-V3 uses the exact same enclosure as the LP-2020A+, I reviewed earlier.

See a size comparison w/ the LP-2020A+ below:

Lepai LP-2020A+ and LP-V3 Mini Amplifiers

In addition to touting a BOSE IC, the LP-V3 promises an RMS Power Output of 25 Watts. No clarification if this 25 Watts is per channel or total watts...

The next two pictures below show both ends of the amp...one for the controls, the other for the connections. Here again, the LP-V3 is a clone to the LP-2020A+:

Lepai LP-V3 Controls; Power, Tone/Direct, Bass, Treble & Volume

Lepai LP-V3 Connections; RCA, 1/8" inputs, Spring-Loaded Speaker Terminals and 12v5A DC  Power Input

Well, enough about the connections and controls, how does the LP-V3 sound? Well, in a nutshell, weak. I was expecting much more dynamic and punchy sound as delivered by the LP-2020A+. The LP-V3 appeared to run out of steam quickly and obviously didn't put out anywhere near the power of the 2020A+. In fact, the LP-V3, reminded me greatly of the tiny and unimpressive Kinter MA-150 I tested earlier. Very disappointing, especially considering the supposed "Real" RMS output of 25 watts. I was beginning to seriously doubt the validity of this claim. Fortunately, I have an easy way to determine the actual RMS output of this amp...

Results? Not impressive and not even close to the 700 Watt, or the 25 Watt RMS ratings. Using a 12V 35Ah Sealed Lead-Acid battery showing 13.0V of charge, I was able to obtain:

Output Test Results:

  • 4.43V RMS of Unloaded Output at the speaker terminals
  • 2.0 Watts RMS / channel at 8 ohms
  • 3.6 Watts RMS / channel at 4 ohms
  • 5.1 Watts RMS / channel at 2 ohms
  • 11.9 Watts MAX / channel at 2 ohms

(tests above were conducted using a 1kHz 0dB Sine Wave Test Tone from the SMD DD-1 test disk and output was verified by the DD-1, which detects distortion at 1%. The resistive loads of 8, 4 and 2 were conducted with BOTH channels loaded)

Stay tuned for more tests of these mini amps and see which one (if any) you should buy. Check out my video review of the Lepai LP-V3 below. 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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Wednesday, November 30, 2011

500 Watts in Your Pocket? Kinter MA-150 Mini Amp

Kinter MA-150 vs. CD: Size Comparison

The promise of 500 Watts in a palm-sized amplifier is appealing to many people. The Kinter MA-150 is another contender in my Chinese Mini Amp Invasion shootout and is the smallest amp in the bunch. Although technology such as "Boosted Rail" has enabled Rockford Fosgate to make the PBR300x1 just slightly larger, it "only" promises 300 Watts of power at 1 ohm. Not to mention, the PBR300x1 costs around 10x as much as the Kinter MA-150...

I picked up the Kinter MA-150 from an eBay seller for around $15 US shipped from China. Now, logic will tell us we shouldn't expect much from an amp only costing a few dollars, right? Yes, this is a rational thought. "You get what you pay for" comes to mind. So, what does the $15 get you? Continue reading...

The Kinter MA-150 has a slightly different design than the other amps in this shootout as it requires molex-style plugs for the speakers and power. The other amps in this comparison have spring-loaded speaker terminals and a 5.5mm x 2.1mm center positive power plug.

Kinter MA-150 Speaker Output and Power Inputs

The opposite side of the MA-150 has a USB port for charging external devices, RCA L/R jacks, Volume knob and crossover switch. See picture below:

Kinter MA-150's USB, RCA, X-over and Volume adjustments

For more details on the technical specifications, please see the Chinese Mini Amp Invasion article for a spreadsheet comparing each amplifier in the shootout.

The Kinter MA-150 is heavily marketed on eBay as a motorcycle or scooter amplifier. Obviously, the main reason is the small size, low power consumption and "rated" high-power output. Now, logic and science will tell us, based on the MA-150's 12v 0.5A power requirement, you can use the equation Watts = Volts x Amps to get 12 x 0.5 = 6. Taking into account 100% efficiency, the amp should put out 6 watts, based on the power going in. Well, unfortunately, the amp is NOT 100% efficient, so even the 6 watts may be a stretch.

Power ratings vs. actual output aside, I decided to run the sound quality test first. I tested several tracks, including one of my favorite "Chelsea's Day" by Sam Cardon. It was readily appearant to me the MA-150 didn't have the power, clarity or dynamics of the Lepai LP-2020A+ . My reference speakers, the Athena Point 5 MKII bookshelf speakers are extremely transparent and it was obvious the MA-150 was struggling to push them to room-filling level. Again, based on the output I was expecting, this wasn't a surprise to me. After a few minutes demoing my reference tracks, I decided to put the MA-150 on the OldSchoolStereo.com test bench and get some actual numbers.

Results? Not impressive and not even close to the 500 Watt rating. Using a 12V 35Ah Sealed Lead-Acid battery showing 13.0V of charge, I was able to obtain:

Output Test Results:

  • 4.56V RMS of Unloaded Output at the speaker terminals
  • 2.1 Watts RMS / channel at 8 ohms
  • 3.4 Watts RMS / channel at 4 ohms
  • 5.3 Watts RMS / channel at 2 ohms
  • 15.6 Watts MAX / channel at 2 ohms

(tests above were conducted using a 1kHz 0dB Sine Wave Test Tone from the SMD DD-1 test disk and output was verified by the DD-1, which detects distortion at 1%. The resistive loads of 8, 4 and 2 were conducted with BOTH channels loaded)

Stay tuned for more tests of these mini amps and see which one (if any) you should buy. Check out my video review of the Kinter MA-150 below. Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.

See my video review / bench test of the Kinter MA-150 and decide for yourself if this is the amp for you...


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Saturday, November 26, 2011

Chinese Mini Amp Invasion! Kinter, Lepai and More

Mini Amps Galore! 3 Models from Kinter, 3 from Lepai and 1 from TeLi

If you spend anytime on eBay looking at car audio amplifiers, then you've surely come across some of the amps I'm going to talk about here. Lepai and Kinter are just a few of the brands you'll see quite often. Some of these mini amps are small enough to fit in your pocket and promise 500 to 700W of power. So why spend several hundred dollars on a fancy name brand amplifier when you can pick up most of these for under $20 US shipped? In the near future, I'll test each amp for RMS Watt output and with some reference speakers and we may soon see why.

After receiving and testing my first mini amp, the Lepai LP-2020A+, I decided it may be interesting to pick up a few more of these mini amps and have a shootout! Here are the models I've obtained thus far:

Lepai Amps:

  • LP-2020A+ - my first mini amp, rated at 550W MAX (20W RMS) output. Tripath design, TA-2020, 2-channel, RCA/3.5mm input, bass/treble/bypass, large volume knob w/ blue LED backlight. 4-8 ohm compatible, 9-13.2V 4A power requirement (per box, amp says 12V 2A?). S/N ratio >80dB
  • LP-V3 - "This amp is use BOSE power IC" (my favorite amp quote). Rated at 700W MAX (25W RMS) output, identical in size to the LP-2020A+ (so why the 700W rating?). 2 channel, RCA/3.5mm input, bass/treble/bypass, large volume knob w/ blue LED backlight. 2-8 ohm compatible, 9-14.4V 5A power requirement (per box, amp says 12V 2A also). S/N ratio >80dB
  • LP-168HA - 2.1 (3 channel) design with ratings of 40x2 and 68x1 watts. Has separate volume for bass, built-in x-over, bass/treble/volume (all same size). RCA/3.5mm inputs, USB port, spring-loaded speaker terminals for Front L/R and Sub. 14.4v 5A power requirement.
Kinter Amps:
  • MA-150 - the smallest amp in the group, rated at 500W MAX. BTL desigh, filter for L/Off/H (x-over?), RCA L/R inputs, speaker/power connections by molex-style plug w/ attached wires. 12v 0.5A power requirement
  • MA-170 - Similar design to the Lepai LP-2020A+, but smaller. BTL design, 2-channel. Large volume knob, bass/treble adjustments, sprint-loaded speaker terminals, RCA L/R inputs. 9-14.4V DC power requirement, no Amperage specified. Rated at 100W PMPO or 4W x2 RMS, S/N ratio >70dB
  • MA-200 - largest amp in the group. 4-channel design using 2x TDA7377 IC's, rated at 41W x4 channels RMS at 1kHz. Has equal size knobs for treble/bass/volume. Includes display for function display; AUX or FM. Includes input for USB and SD/MMC card. 12V 5A power requirement.
TeLi Amp:
  • A6 - identical in size to the Kinter MA-170. 2 channel, BTL design, RCA/3.5mm inputs, bass/treble range +/- 15dB. 8-15V DC power requirement (no amperage mentioned)

See the latest Spreadsheet below with specs comparison or download it if you prefer:




Stay tuned for upcoming tests of each mini amp and we'll see which one (if any) you should buy. Check out the video overview of each amp below. Make sure to Subscribe to my YouTube Channel to stay updated of my latest videos. You can also follow me on Twitter @oldschoolstereo.

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Big 'Ol Stack of Mini Amps!

Kinter MA-150 in Orion HCCA Red

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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Friday, November 11, 2011

Can The Orion Take The Punch?


Rockford Fosgate Punch 45HD and Orion 222 SX

The Rockford Fosgate Punch 45HD and Orion 222 SX....by today's terms would be called "tweeter amps". Go back 20 years to 1991 and people were using these amps not only to power subwoofers, but in some cases entire systems! Since both amps were rated at 45 watts or less at 4 ohms (both channels), people either had really efficient speakers or didn't require high volumes, right?

Well, many people were told and believe the old school amps are always "very" or "highly" underrated. Read on to find out if this is the case with either or both of these mini powerhouses.

First up, the Orion 222 SX appears to have a heat sink surface area advantage at 8.5 x 8.5 x 2.25 inches. It carried an MSRP of $329 US back in 1991 (reference - Car Stereo Review, July/August 1991) and included the following specifications from Orion:

222 SX Ratings at 12 VDC (both channels driven):

4 ohms stereo - 22 watts RMS
2 ohms stereo - 44 watts RMS
4 ohms mono - 88 watts RMS
(not rated to handle 1 ohm stereo or 2 ohm mono loads)


More Specifications:

  • Requires external 15A Fuse, 20A provided by Orion (according to the manual)
  • Stereo, Mono or Mixed-Mono operation
  • Left and Right Peak Power LED's
  • 0.005% THD at rated power
  • Damping Factor - Greater than 500


On one side of the 222 SX are the power/ground wires (10 gauge), plus the 9-pin molex connector for speaker and turn on connections (See my Youtube Video on how to make these yourself!). The opposite end of the amp has input connections from both RCA and DIN connections. The DIN connection supports Orion EQ's and crossovers and provides phantom power for these devices as well. There are also two buttons, one for "EQ", providing a +15dB boost at 40Hz, -4dB at 200Hz and +6dB at 10kHz, in addition to a "Mono" button for bridging the amplifier. The 222 SX also has Peak/Power LED's and a single input gain control. See the connections below:


Orion 222 SX input connections, Peak/Power LED's, Gain control, EQ and Mono buttons
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Next up may be Rockford Fosgate's most well known amp from the mid-80's to early 90's, the Punch 45. In 1991, Rockford updated their vulnerable Punch 45 to the Punch 45HD, aka "Hybrid Design". Again, many competitors in the late 80's/early 90's used a single Punch 45 to compete in the 50-watt and under class.

The 45HD required spade connectors for the power and ground inputs. The opposite side includes; speaker/remote connections via 6-pin Molex plug, Bass/Treble knobs, Left/Right RCA Inputs and gain controls for both channels.


(Top) Rockford Fosgate Punch 45HD's 6-pin molex connector, bass/treble controls, left and right RCA Inputs and Gains

The slightly smaller heat sink of the 45HD measures 6.6" long  x 8.6" wide x 2.2" high and carried an MSRP of $275 back in 1991 (reference - Car Stereo Review, July/August 1991).


Punch 45HD Ratings at 12.5 VDC (both channels driven):

4 ohms stereo - 22.5 watts RMS
2 ohms stereo - 35 watts RMS
4 ohms mono - 70 watts RMS
(not rated to handle 1 ohm stereo or 2 ohm mono loads)



More Specifications:

  • Requires external 15A Fuse, 20A can be substituted for "extreme" loads
  • Stereo, Mono or Mixed-Mono operation
  • 0-18dB Bass Boost at 45Hz, 0-12dB Treble Boost at 20kHz
  • 0.05% THD at rated power
  • Damping Factor - Greater than 200 at circuit board, greater than 50 at speaker leads


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Now you've read about the ratings and specifications, do you have a choice between the two for powering a single 8" subwoofer? I realize these amps may not be well suited to drive subwoofers, but this is OldSchoolStereo and I'm taking the test back to the old school!! Luckily, I have an early 90's JL Audio 8W1 (4 ohm) which will be the perfect test sub for these amps. In addition to the subwoofer test, I'll also test resistive RMS wattage output from both amps at several ohm loads.

Now, the question I'm sure many of you are asking....did I have a favorite before the tests? Well, I must admit I've tested the Punch 45HD before and knew what to expect from this little "punch". That said, I had high hopes for the 222 SX based on how well the Orion 275 SX fared against the Punch 150HD and Phoenix Gold MS-275. This is a CLASSIC shootout as I expected the results to be very close. I can't go without saying I broke the rule of my YouTube channel saying I wouldn't do "woofer flex" tests. I just couldn't resist seeing how these baby amps pushed the JL 8W1. I also used my Zoom H4 audio recorder for GREAT quality bass without distortion. Just make sure you use your headphones while watching the YouTube video to get the best experience (well, unless you are watching this on your home theater with an 18" powered sub...)

I put the Orion 222 SX on the bench first and connected up the resistor bank, 1000Hz test tone and Velleman HPS50 oscilloscope/true RMS Volt meter. Results are:










Sunday, November 6, 2011

Rockford Fosgate PBR300x1 "Boosted Rail" Amp

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Old School Orion 222 SX vs. Rockford Fosgate PBR300x1

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As we all know, technology has a way of "shrinking" electronics over time. Have you ever seen an early laptop computer? Or how about a 1st generation iPod? Compared to the latest laptops and iPods, the first generation models are large and clunky.

Transition over to car audio amplifiers. Although this is OldSchoolStereo.com, I still appreciate technology and have been eager to try out one of the new "mini" amps currently on the market. One which grew particular interest is the Rockford Fosgate PBR300x1. This amp measures a tiny 6-3/4"L x 4-1/4"W x 1-1/2"H, small enough to fit in the tightest automotive locations. Here are the full product specifications:





  • mono subwoofer amplifier
  • 75 watts RMS x 1 at 4 ohms (150 watts RMS x 1 at 2 ohms)
  • 300 watts RMS x 1 at 1 ohm
  • CEA-2006 compliant
  • Boosted Rail amp technology
  • Dynamic Thermal Management cooling system
  • variable low-pass filter (35-250 Hz, 12 dB/octave)
  • differential-balanced inputs eliminate noise from your vehicle's electrical system
  • preamp and speaker-level inputs
  • optional wired remote bass boost (0-18 dB at 45 Hz)
  • 10-gauge power and ground leads and a 30-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 30-amp in-line fuse between the distribution block and the amplifier is recommended
  • 6-15/16"W x 1-9/16"H x 4-5/16"D


  • Something I noticed immediately after opening the box was the inclusion of molex-style connectors for the amp. Am I missing something here or are we going back to the early 1990's? I couldn't help to think of the 1991 Punch 30HD which uses similar connectors. See pictures below for all of the connections, plus a size comparison to the 30 watt Punch 30HD.


    PBR300x1 connections including crossover, gain, hi/low input and Remote Punch EQ


    PBR300x1 Speaker output and Power connections

    2011 PBR300x1 vs 1991 Punch 30HD - 300 watts vs. 30 watts!


    Ok, so an amp almost small enough to fit in your pocket can deliver 300 watts? Well, according to the birthsheet included with my PBR300x1, it will actually do 315 watts RMS at 1 ohm (14.4v)! Impressive numbers from such a small amp, but how does it sound powering subwoofers?

    Well, you can see (and hear) first hand by watching my video below. I auditioned the PBR300x1 on my test bench with subwoofers including; 8" JL Audio 8W1, 10" Kicker Solobaric S10c and 12" JL Audio 12W6v2 D4. The results were impressive, to say the least. I'm really looking forward to getting the amp in my daily driver for a true test of this little beast and how it performs in the harsh automotive environment.


    Stay tuned for an upcoming power output test of this amp. 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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    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!