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 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 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:



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: