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Old 18th September 2004, 02:33 AM   #11
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Join Date: Jul 2004
Location: us
Default amps

I am using some soundstream amps now i have a class A 3.0 on the tweets and a D100II for the mids . They are powerfull and clean. I am thinking of trying a different amp for the tweets(I have QSD 216 quarts and i am still trying to dial in the tweets)

I was kicking around the idea of using linear power

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Old 18th September 2004, 01:49 PM   #12
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Join Date: Apr 2004
Location: Edgewood, NM
IMHO the best car amps I have ever heard are far and away the Synopsis Audio DX2X50's I have in my car. I will admit that I have never heard any true "high-end" amps other than an Audison before, most are the cheap Fosgates, Alpines, etc.

Anyway, the Synopsis amps were designed by a good friend of mine. He took the initiative of producing a large quantity of amps for sale, but he has since been "screwed" by the car audio industry and has resigned from the business. I have kind of taken up where he let off, I am selling a few amps here and there. I have the production lot available to sell if anyone here is interested.

Specs are: 2 channels of 50W of very clean musical power into 8 ohms. Can drive as low of load as 2 ohms without problem, meaning 200W or so out. When running in bridged mode it really puts out the power. The amp has no compromises in design to make it cheap, so everything is the best. All op-amps in the crossover and front-end are high-end Analog Devices components, complimentary pairs of lateral mode MOSFET's are used as the output stage, Dale wirewounds, adjustable bias current, all discrete power amp portion, low-impedance supply filtering (Panasonic FC's), regulated power supplies, true over-current protection, thermal overload protection, DC protection and more. Great design that I have in my car right is like a home hi-fi amp with SMPS and crossovers to fit in a car. The case is really nice extruded amuminum with nice endplates labeling all controls, including LP, HP, AP switch, mono-stereo filter switch, HP freq, LP freq, Q factor, boost (+18db), etc.

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Old 24th September 2004, 05:12 AM   #13
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Location: Doerun, GA
My experience is 10 years out of date. At that time, the Zapco System 151/200A was the cleanest, quietest, most natural sounding amp I had heard. And it should have been at $4 per watt.

Other notable models were Linear Power 2002, Soundstream D200II and ClassA 50, and a couple of the Autotek 7xxx BTS amps.
A very notable exception was Alphasonik's (yep) PMA 2100. Not the best of the best, but sounded so nice your install would likely mask the difference between it and other that would cost 2-3x the price. I used one myself for a couple of years that *sounded* better than RF's legendary Power 650's and Power 300's that a couple other guys in the same shop used. Their installations just didn't showcase SQ.

Which brings up an ambiguous point...

It's difficult to compare amps without swapping one for another in a given installation. Speaker installation has a profound affect on a car system. System/gain/crossover tuning has a very profound effect on a car system. You really can't A/B anything very well in a sound room, and you can't do it at all from one car to another without knowing a lot about how the systems are set up and adjusted.

It's also difficult to compare brands, as performance changes from one model to another within any given line. Performance can change from one year to the next within a given model with evolution of design. The really top-notch companies do tend to be more consistent with top-notch products, but often a single model really stands out.

The only way to figure out which models stand out is to install lots of amplifiers on a regular basis, and use consistent methods to install, tune, and judge them.

And of course, this post is bordering on off-topic because I haven't used any of what's made now.

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Old 24th September 2004, 07:33 AM   #14
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Location: London, Ontario, Canada
I wonder... anybody ever compare a car amp to their hifi amp by bringing it into the house and A/B using the audiophile speakers?

Those who claim to be making history are often the same ones repeating it.
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Old 24th September 2004, 09:07 PM   #15
sma is offline sma  Indonesia
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Join Date: Dec 2003
Location: jakarta
i use audison at my car for drive the custom Seas excel woofer + scanspeak R2904/7000 tweeter.nice audiophile amp.but need little modification for get the best amp.

audison VRX is use class A driver module,Sanken transistor.I change the capacitor use panasonic FC at amp supply and preamp supply.and little bias the transistor into class A/B.

this way improve more open sound,solid midrange and very deep bass.I think now only genesis,tru technology and audison.still make car audiophile amplifier.

Brax is flat and too much high,very germany sound.

happy listening.
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Old 27th September 2004, 05:47 PM   #16
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Join Date: Aug 2004
Location: Chicago
Also you must try Celestra, Sinfoni and Linear Power those are the BEST I have ever ever heard. I like them better than the Audison as the Audison tends to get a little harsh on the high end and the sound stage is two dimensional.
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Old 5th October 2004, 11:10 PM   #17
JZatopa is offline JZatopa  United States
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Join Date: May 2003
Location: Chicago
I have installed many different amps and some of the best I have heard are JL slash series amps. I will say a great install will get you much better sound in a car then what amp you coose at some point.
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Old 7th October 2004, 04:55 AM   #18
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Out of the amps (probably between 2000 and 3000) that I've tested, the best one is definitely the McIntosh MC4000M. It's rated to make less than .005% THD+N from .5w to full power, 20Hz - 20kHz; it met those specs easily. After that, my next favorite amp was a McIntosh MC427, followed by the Zapco Studio Series, and after that the old Alpine V12 line (MRV-352, MRV-1505, etc). Great stuff.
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Old 18th December 2004, 05:52 PM   #19
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Location: USA
fo me ,
celestra VA series is the best amp,
I ever compare it with simphoni, genesis, and phass,
still CELESTRA more musical sound
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Old 19th December 2004, 01:07 AM   #20
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Location: Terre Haute, IN
I may be laughed right out of here, but JBL amps have always worked great for me!
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