The best way to test this is with a full-scale sine wave from the SB2.
Very small amounts of clipping are audible on a clean sine input,
whereas with music it is only obvious in the loud parts.

In recent firmware revs there is a 1102.5 Hz sine test built in to
Squeezebox2. Press "3" on the splash screen to make it run. 

Then use the new analog-output attentuation setting, and try dropping
the volume a couple decibels. If you notice any difference at all, then
it means your receiver's inputs are clipping. Increase the attenuation
setting until the sine wave sounds clean at any volume level.


-- 
seanadams
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