I have had many set ups in my day form MTX, JL, Fosgate,T3, Crossfire, Orion, Earthqauke, ECT. I had 2 DVC P3 12s on a 1200w Fosgate amp with a box tuned to 33 htz. ( i custom build most my boxes, exepy my dodge.FOXBOX). I also had 2 Memphis 10" DVC same style box at 33htz runnung of a 250w RMS Mtx amp, and the Memphis hands down demilished the Fosgate with a 1/4 the power. But hey, everyone has their own opinion. So here is mine-
Fosgate-****** sound quality that has to have alot of power.
Kicker- decent sound qaulity with the right amp.
JL- better sound quailty,decent on sensitivity
Alpine - not as good as JL on sound qaulity, but good sensitivity
Memphis- Good sound quality with good sensitivity
T3- awsome, but takes a lot of power
Orion- kicker is way better
Cross fire- a little better that Orion
Earthqauke- Just bass, no quality
I have tried many diffrent set ups, but this is my 3rd. Memphis. I just keep going back to them.And just remeber getting a bigger speaker doesnt mean its going to be louder. There is no difference especially between 10" and 12", just the freqencies they can disburst. Also the bigger the speaker=less quailty. I used to be into nothing but bass, but know i love quality.I get way more complaments from a nicley tuned SQ setup than i ever did with SPL. Sorry just venting. lol
All in all, qaulity is always better.