CommanderROR wrote: 
> I'm not sure. I'll see if I can find the time to test the B+ without the
> amp. I'll also ask about the amp power draw at Hifiberry. 
> What worries me is, that it's exactly the same, with music playing or
> without...so the amp is not powering down.

Hi CommanderROR,

The amp is supposed to be 25 watt output amp, so it must draw more than
25 watts when playing full volume with music with lots of bass. Class D
amps are vey efficient (in the order of 80% or 90%, something like that)
so input watts should be reasonable close to output watts. At the end of
the scale class A amps can be as little as 12.5% efficient.

It is surprising that when playing music at sane volumes, an might be
drawing only a couple of watts. The efficiency of your speakers also
come into play here as well.

regards
Greg


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