usch;499517 Wrote: > Basically that's how it works, yes. The amplifier outputs an > oversampled, pulse width modulated, digital signal, which is then fed > directly to the speakers through a low pass filter that eliminates the > clock frequency. It's the same principle that is also used in switching > power supplies, except that a power supply is designed to deliver a > constant voltage, while a D-amp is designed to deliver audio signals. > > The advantages are that such an amplifier has a very high power > efficiency factor, and that you don't have a traditional DAC that might > theoretically cause nonlinearities. The disadvantages are that you need > an extremely stable power source because every hum, ripple, noise, or > voltage drop is immediately superimposed on the output signal, and that > a switching amplifier creates HF noise similar to a switching power > supply.
I've no idea if Sonos uses them, but as an example of the kind of signal path that could be "all digital" consider the following: http://www.icepower.bang-olufsen.com/en/solutions/mobile/mobilesound3/ (The above is underpowered, for the Sonos application but the concept still stands.) -- dsdreamer ---------------------- "Dreamer, easy in the chair that really fits you..." ------------------------------------------------------------------------ dsdreamer's Profile: http://forums.slimdevices.com/member.php?userid=12588 View this thread: http://forums.slimdevices.com/showthread.php?t=73069 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
