Really wasn't that difficult, just took time to deaden the space between the inner and outer fenders - I used 8 cans of expanding spray foam, sprayed in the holes and sealed it off with tape while it expanded and hardened. After that, I used some Pella flashing tape I got from Lowe's, it actually has a rubber backing to it, it absorbs resonant frequencies. Sealed it up real nice, absolutely ZERO air leaks from the enclosure.
I'm considering dumping the (2) 4-ohm subs I have now, the amp I have is stable to 1-ohm loads. May run (2) dual voice-coil 10's, get the max power out of the Lightning Audio 1000.1D amp I have. As it is now, some low-end techno (Techmaster PEB and Bass Mekanik) gets my rearview mirror moving enough so I can't see out of it. If I were to double the power (going from a 2 ohm to a 1 ohm load) and using more efficient subs (the PB 10's are only rated at 87w/1M), I might reach 145db. A FAR, FAR cry from some systems that take up the entire volume of a Yukon or Tahoe, but more than enough to rattle my 46 yr old ass.
I may even add another two 10" subs in a custom center console, specs the same as the rear enclosure. I figure if (2) subs are good, then won't (4) be better????
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