I'm running the audio control lcq1 in my 2006 mega cab and I'm having issues with the sub volume dropping to about half and coming back to full intermittently. I have tried to change the summing jumpers to every possible combination, checked amp grounds, tried different amps all with the same result. I can use a cheap loc and have zero issues with the sub volume changing. The channels that go to the subs is the only one doimg this. Does anyone have any ideas I can try to clear up this issue?? Any help is greatly appreciated. System details are listed below... Infinity sound system with factory nav/6 disc Audio control LCQ 1 with acr2 knob Jl audio xd600.6 on mids/highs Jl audio xd600.1 (x2) on subs (2 ohm load each) 4 jl audio 10w3's