Ok so just spent 4hrs checking every single wire and playing with this crap. When I set the lpf to 50hz, remote knob at half, I get NO VOLTAGE to the sub channels. Then I noticed I had the amp in 2ch mode instead of 4ch mode. The amp works in 2ch mode because it has the ability to take ch1&2 RCAs and combine them into a mono for the sub. However, I ran 2 sets of RCAs anyway. When I switch to 4ch mode sub is quiet. Checked the connections on the amp and I notice that the RCAs are loose as in they aren't snugging up nice n tight. I looked at them and they aren't bent or anything. Gently squeezed on them with a crimper to snug them up but no dice. I have to use the amp in 2ch mode to get anything to the sub. I'm beat from taking apart the dash another 3x. I know I should return the RCAs to knukonceptz but at this point I'm not looking forward to ripping everything apart again to get a set of working RCAs. What a frustrating night.
