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Although I had successfully measured amplifer distortion at the loundspeaker terminals, when I did this a second time I managed to damage my inbuilt PC sound card.

I was not using a voltage divider probe since I knew the AC levels were no more than 250mV. I don't fully understand what went wrong but there was probably a DC polarity discrepancy in my setup since the amplifier output is DC coupled and the centre voltage can be either + or - (actually only 5mV).

I looked to the REW HELP file on this but found nothing.

A post by AudiocRaver

http://www.hometheatershack.com/forums/spl-meters-mic-s-calibration-sound-cards/66764-rew-connection-cabling-no-amp-speaker.html

seems to give the essence of the matter, that one must ensure the sound card and amplifier polarity match.

Is there an Idiot's Guide?
 
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