ok check this i got a hu with 2v preout (which sucks) new one coming though. and i got 2 run of power 2 runs of ground to my niche audio 6000d on my 15 hd3 but when i slap the 40hz tone in prong the speaker terminals with dmm i only read 5volts max with gain all the way up? on ac volts whats the matter?.... could it be the peice of sh!t hu?
-volume on HU should be 3/4 up. -u should play 50hz test tone for dmm. -make sure ur equalizers and everything are set to 0 -have loud button on or off (depending if you use this button or not, set it to how u will have it daily)