ncarver;582936 Wrote: 
> Oh, you are suggesting open circuit measurement--I missed that.  OK, but
> that is kind of a pain as I would have to figure out preamp volume
> setting for one source for a particular music track then disconnect
> speakers, run measurements to determine volume for other source,
> reconnect speakers, listen, and then repeat this entire process for
> each new track (unless I could get away with the same exact volume. 
> That doesn't sound too easy.  I probably will just wait until that cats
> are not downstairs and measure with speakers connected.

Use a white or pink noise track. 
http://en.wikipedia.org/wiki/Pink_noise

I would just figure out a good calibration volume at the source.  Use
the digital volume control of the squeezebox.  This way it's easy to
write down the calibration levels of various DACs.

Example:

Set the squeezebox volume to 90.  Measure final stage output voltage

Switch to squeezebox+DAC.  Measure & level to same voltage. 

Then you would have a calibration level for each DAC compared to the
squeezebox internal dac.

This wouldn't work as well for comparing other sources like CD players
that don't have their own level adjustments.


-- 
SuperQ
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