Phil, David,

Thanks for taking the time to reply - your comments are very helpful. I already have the crossover set at around 120 Hz - should I try lowering it to 100?. I think the problem is with my enclosure as the footbox is not completely sealed - it is open to the ski locker on the port side and is open to the under floor cable chase on the aft end. Plus there's a hole on top where all the cables running thru the foot box exit. This footbox is very difficult to seal and I don't want to go thru the trouble of cutting out the footbox and building a custom enclosure. Is there a sub that would work better for this application than the 10" Polk/Momo MM2104 that I am currently using? Do u think I need more power than the 210w that the zx700.5 is putting out?

What about the subwoofer level control on the head unit? It goes from -15 to +15. I currently have this set to 0. Can I turn this up to get more volume? Is this just another volume control like the remote bass knob?

Thx.

Al