Originally Posted by Houstonshark
It's possible. Did you use the 0db track? I would just lower the volume one or two and tune it from there.
I just followed the manual and ran the 40Hz track and the 1kHz track. I measured from the headunit directly and from the amps, and it was always the same - no distortion at all with the 40Hz track, and distortion at level 34 out of 35 with the 1kHz track.