Hypex N core module

All Class-D’s today have the same problem. The switching frequency is too low to be filtered out effectively completely with the Class-D’s output filter, without effecting the upper mids and highs.

A statement George loves to repeat without practical data to back it up with.

He’s the guy who in the 21st century argues airplanes can’t fly because they are heavier than air.

Me, I'm loving Class D right now.

Best,
E

A statement George loves to repeat without practical data to back it up with.

The switching frequency is several 100sKHz at the very least and the output filter does not filter it out entirely. Regardless the filter does not have the effect at audio frequencies that George suggests.
The effect of the filter is to remove the switching frequency, which none of them do entirely. What is left is called 'the residual' and will be a sine wave at the switching frequency. It can't be heard, and because its a sine wave does not interfere with radio and the like. But it is energy, and should be unable to damage the tweeter. So it should be at a low level. The inductance of the speaker itself is often enough that the residual is of no consequence unless the switching frequency is stupid low (and there are no class D amps in production like that).

Isn't the Evolution model supposed to a step above the ST-10?  There's a thread about it on AudioCircle, I think.

@jackd nuprimeaudio stuff looks nice but I think the output from them is not competitive with rest of the market offering at this price. That may not be important for lot of folks I assume.  Signal to Noise Ratio (SNR): 91dB @ 10W is this competitive with rest of Class D offering?.

You all may want to check out Legacy's Powerbloc latest generation amps; I heard them in Atlanta driving Valor and Caliber XD and late this summer at Legacy driving Valor and Whisper XDS.  Frankly they opened my eyes to what is possible today with lower cost/higher value/well-designed amplification.  I don't know specs but believe Legacy would share anything that they have but they are definitely worth a listen before you spend more than their price point.