Accuphase Class D, Digital Power Amplifier from 2005.


http://www.accuphase.com/cat/px-650_e.pdf

So this amp converts analog signals to digital and back to analog on output?

Accuphase is right when describing this amp as digital? What would be the difference if the amp was in fact analog class D?

Thanks.




C29d0c0c 8a4a 4032 a11f eb6239f72433cosmicjazz
Interesting, on this interview: https://www.youtube.com/watch?v=32fEnUrWjaM

Accuphase tells that they produced a Class D amplifier once, the PX-650, but they was not satisfied with the sound quality, and also they only refers to Class D as being digital amps, and will not produce another model yet, due the fact that digital amps still not sound good for they, when comparing to Class A or AB.

So, there's still amplifiers engineers that advocates that all Class D amps, are digital amps?
Thorsten Loesch (AMR)
All Class D amplifiers are essentially delta-sigma DAC’s.
If the input is not digital PWM signals (aka "DSD") but analogue audio then it is also a Delta Sigma Analogue to digital converter...
Now DSD (aka SACD) which to my ears fails to come close, never mind equal true PCM CDReplay in most aspects of sound quality, operates at 2.8MHz switching, or around 10 times as fast as common Class D Amplifiers...
Why anyone would want to listen through an A2D followed by an D2A Converter that arearound 10 times worse than single speed DSD is beyond me.
But with enough hype and snazzy naming it cannot help but sell high and wide.
Class D is not, usually digital.  :)

It acutally uses a cool oscilator to crate a switching signal which is then filtered.

The latest Technics amps though, they come terribly close!

Outstanding news that Accuphase is dipping their toes in with an amp that has meters!!