Does the power amp (without volume control) have an input level adjust? 
If not I'd suggest using a passive volume control.  This could be as
simple as a (switchable) attenuator.

The reason for this is that if there is no attenuation between the sb
and the power amp you risk blowing your speakers if a user, software or
hardware error causes a full volume output from the DAC.

The cheap / simple and most likely very close to best audio quality
solution would be to make up an rca lead with an attenuator in the
poweramp end.  The attenuation should be set such that maximum sb
volume results in the highest level you ever want to listen at (which
should be within the power handling abilities of the amp+speakers).


-- 
bludragon
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