need an audio file sweeping from 20hz to 20khz - download link at tinyurl.com need spl meter set to slow C-weight if using krk rp5s set level at rear to +6db if using krk 10s set te crossover to 80hz play audio file...at 14 sec u should get a peak db reading on your Spl meter. at 28 sec u should get another peak db reading on your spl meter. (i got my peak levels at 14 sec and 28 sec but your setup could be different, just note the the highest db levels and match them) adjust the volume level of your subwoofer at the rear of it until the first db peak reading matcges the other peak readings.
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