Took a few minutes today and messed with some head unit settings on the sub channel finally. 120hz LPF set and reversed phase. Not sure if I like the reversed phase as it seems to be a little distracting from the front but the other hand it makes it sound like theres actually a sub in the trunk (there isn't one). The LPF seems to clean up the sound a good deal, I think I'll end up setting the HU back to through and set the LPF on the amp around 150hz since 120hz sounds a touch low. I still need to actually set my gains with the fluke meter though, maybe tomorrow.