Originally Posted by baitkiller
OK, Ill take my glasses down he boat and actually read the settings. Is the gain pot what I should be adjusting? Where do i set that?
Yes, the gain needs to be set correctly fallowing a procedure, but thats not what we're referring to here.
What you need to check first is the cross-over filters. Your 4 chnl amp will most likely have two, one for both halves of the amp. It sound like the half running the front speakers is set to "Hi-Pass" as it should, but the rears are set to "Off" or some times called "Full-Pass" . Once the cross-over filters are set correctly, then, as David noted, set the Freq. dials to 50-60 Hz range.