[R-390] Class D Amplifiers

[Mark Richards]

Barry,

Your question prompted me to read a bit more into Class D (digital) 
amplifiers.  Maxim semiconductor makes a line of these as modules and 
they stress the low EMI/RFI point.  If this particular amplifier is one 
of the Maxim modules, you might not be stuck with a noisy unit, provided 
it's designed right.

However there are a number of manufacturers who specialize in Class D 
for high-end audio and here is where there's a sensitivity to 
performance and clean operation.  A seemingly good outfit with a bunch 
of low-priced kits is here: classdaudio.com   I've yet to buy from them, 
but plan to in near future for a simple powered speaker monitor project.

/k1mgy




On 02/07/2014 11:45, Barry wrote:
> A while back, there was some discussion on this list about outboard audio amplifiers.  I don't recall whether these came up, but has anyone worked with Class D amplifiers?  If so, are they troublesome - specifically with respect to noise?
>
>  From what little I've read about them, there are some pretty rigorous constraints with grounding, filtering, etc., to keep them from sourcing too much noise back into the system where they're used.
>
> Just looking at the one below and thinking that, at the price, it would make a decent amp for the R390.
>
> http://www.parts-express.com/pam8610-2x10w-class-d-audio-amplifier-board--320-604
>