I ran into the first semi-knowledgable car audio shop worker today. He didnt laugh when I mentioned DD and Treo, and he competed in sound quality events. His wife was an SPL competitor sponsored by MTX (supposedly). She ran 5 MTX RFL's with 10 JBL Crown amps in an f-250 and burped 170.6 (supposedly). The dude seemed legit though and I was glad to know that not every lame audio store has lame employees.
yea i have a local shop that knows what they doin. they have a s10 blazer and a 18 inch kicker solo X and 2 hifonics maxximus amps and they burp a 168.8, ive saw it. there sponsered by kinetik and maxxonics i belive. they build custom boxes, FG, install, benchtest, meter, and sell RE for cheap. NICE ppl to. they wil talk to ya all you want and everything.