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-   -   Soundstream Class A 100 II - designed by Pass? (http://www.diyaudio.com/forums/pass-labs/145614-soundstream-class-100-ii-designed-pass.html)

Bronson_k 10th June 2009 03:53 AM

Soundstream Class A 100 II - designed by Pass?
 
from: http://cgi.ebay.com/O-S-Soundstream-...QQcmdZViewItem

"The Pure A Class 100 IIs are a Nelson Pass design. I have a friend that is good buds with Nelson, and the 100 IIs Pure A Class are his."

Can anyone here confirm?

I am presently using a Soundstream D 200 II (class AB) in my vehicle and believe it to by one of the most musically capable production amplifiers for automotive use that I have ever listened through.

Nelson Pass 10th June 2009 05:45 PM

I did design some stuff for Soundstream as part of my contract with
Nakamichi, but this appears to be later product. I don't know
what's in it or what similarities to the original prototype products
there might be.

:cool:

Bronson_k 11th June 2009 05:40 AM

Thanks Mr. Pass,

Which products did you design/prototype? Are their schematics available to DIY? I am guessing the Class A 100 II amp to be from aprox early - mid 1990s production (built in USA).

If anyone has heard production car audio amplifiers that they believe to be more musically capable (than these older stateside built SoundStream) Id like to know of those amps.

Nelson Pass 11th June 2009 07:13 PM

I thought that the U.S. built Adcom auto-sound amps were
terrific, largely based on the Mosfets circuits I did for Adcom
in the early 90's.

:cool:

MadMutt 12th June 2009 08:04 AM

So what was the tie up between Nak and SS ??

zeonrider 12th June 2009 10:04 AM

Hi!
 
That Amp never be in ClassA.

http://ampguts.realmofexcursion.com/...Class_A_100II/

Very small Heatsinsks!




Look @ Aleph A3 or A5, diferent is large.

Those Amps are real A Class.


Regards zeoN_Rider

Bronson_k 18th June 2009 06:27 AM

which Adcom amps? Did you ever ABAB them to your SoundStream work?

This one? http://cgi.ebay.com/RARE-ADCOM-4702-...rkparms=65%3A1|66%3A2|39%3A1|240%3A1308|301%3A1|293%3A1|294%3A50

Zero Cool 18th June 2009 06:45 AM

The Original D series not the Series II I am pretty sure are based on Nelsons Designs.

A long long long time ago I spoke with a guy that told me the whole story. Or at least the story as he knew it. I'm not sure if I can tell it or not? If N.P. ok's it I will type up the story as i heard it.

The Original D-200 had separate power supplies for each channel. the later models only had one supply and the board was revamped. close to the same circuit however. Still the original D series sounds better. These and the Linear Power are still my all time fav car amps.

I have been wanting to play with the Adcoms but they are still very expensive used. Adcom was the first, or one of the first to do balanced outs from the head unit to the amp. a perfectly logical thing to do in a car, and yet it never quite caught on.

Nelson Pass 18th June 2009 02:19 PM

Quote:

Originally posted by Zero Cool
Adcom was the first, or one of the first to do balanced outs from the head unit to the amp. a perfectly logical thing to do in a car, and yet it never quite caught on.
That it did not says a lot about the auto-sound market.

:cool:

AndrewT 18th June 2009 02:23 PM

multi kW amps, running off a 13.8V supply, in a very few cubic metres of auditorium tells even more of the stupidity that entered the auto-sound marketing strategy.


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