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Pierre 7th December 2004 06:01 AM

Hey, guys, new modules!
I have eventually found a new webpage (seems to be still under construction). It is a company named "ColdAmp" and seems that they will sell Class-D amplifier modules and even SMPSs
They have a list of features and particullarly neat mechanics drawings of the modules they are going to sell. I think that their features are more than interesting, let's hope they have good prices.

I will check the page very often, they seem to be updating it very quickly.

(just in case it helps somebody)


Pierre 7th December 2004 06:03 AM

Oooops! Sorry. The link is:


bruinbear714 8th December 2004 05:01 AM


Pierre 8th December 2004 11:18 AM

Well, yesterday I wrote to them.

They told me that they will publish all the specifications and data in a datasheet as soon as they finish the last reliability tests and optimizations, hopefully in 2-3 weeks.
They also told me that the modules would be available in 6-8 weeks.

The only info they gave me about pricing is that they will cost between 85-100 euros.

I think they look promising, if all the features they claim are really there, and the mechanics look neat, very easy to assembly and quite self-contained. One of the weak points of all the other modules (RFI level) seems to have been taken care of. And if the prices are good...


IVX 8th December 2004 08:49 PM

Hi Pierre!
Why you assume that "One of the weak points of all the other modules (RFI level) seems to have been taken care of." As far as i know the UcD, at least, have better then enough EMI performance, and about SOUND of the UcD enough wrote too. We are waiting amazing sound of the any new class D project, because it performs >90% efficiency? I don't think so..Please note- noone ask about UcD efficiency anymore. Actually i think (i'm sure) that class amplifiers, i.e. A;AB;D, isn't matter, but real matter is designer class, were we? And let's hear it first.. ok, without specs even!;)

Pierre 8th December 2004 09:42 PM

Of course specs and, above all, sound, are the decisive words. I agree with you in that the only pre-assumed advantage of Class-D is efficiency, and that all the rest (the most important thing: sound quality) has to be demonstrated, like in any other amplifier type.

In fact, I was only saying that it could be interesting to see other alternatives out there so I, at least, will be very pendient on Coldamp site updates, specially the specifications when they put them in the page. Perhaps it can be an alternative to LCAudio, CADAudio or UcD.

I want to make clear that I don't encourage or have nothing to do with them.


IVX 8th December 2004 10:40 PM

I want to make clear that I don't encourage or have nothing to do with Hypex too.;-) To be honest, (IMHO) coldamp it's a feedback before filter design, there is reason to decide that it have no so good damping factor, which will fall with frequency growing, and load depended also. Our requirement is still U source? Probably it's a conventional PWM design, 1.5 years ago ssanmor diyAudio Member made such, BTW, thx for Charles. What is new in coldamp concept?

classd4sure 9th December 2004 03:02 AM

Hi Ivan,

I was just wondering how you made out with your UcD /Mueta experiments I saw you working on before?


Pierre 9th December 2004 05:15 AM

How did you know that details about Coldamp amplifiers, did they give you any specifications yet? If so, could you share them with us? It's only that your impresions can't be extracted from the info they give in their webpage, so I supposed that you managed to get a response from them.


IVX 9th December 2004 08:33 AM

Hi Chris,
check this out and forget :(
just IMHO, nothing more, which based on: "High current - toroidal coil output filter with RF post-filter that allows much less ripple at the output than most modules out there."+"Fully synchronous design", i think that if they would take feedback after both filters(i.e. 4 order) it would be called as "advanced features", because i can't assume that such "advanced features" like "Almost pure SMD design" or "Al[l]uminium chassis" is much more exclusive. I don't know..maybe it will be clear after 6-8 week.
ps: what you think about "Designed to use ColdAmp modules from 240V AC mains, avoiding the big size and heavy weight of conventional 50Hz toroidal transformers. Efficiency and size-weight reduction are now taken to the maximum expression."

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