I can't claim I've worked some magic, but today I got a customer's Wrangler sounding pretty decent. He ordered the tiniest sealed 8" Kicker enclosure and I installed a Precision Power i450.1 amplifier to power it. The factory speaker locations have Clarion SRG series 4x6s and 6.5s powered by a Clarion XC1410 mini amplifier at 50W x 4. The head unit is Clarion CZ302. I tuned the 3-band parametric EQ and the bass boost on the amp, which is centered at 45 Hz. I'm sure part of what "works" is allowing the subwoofer to play up beyond the low end of the speakers. It's quite clear the Kicker subwoofer can play midbass very well, as music with bass guitar is very well defined.