He didn't ask which one was the best, but which ones sound better than the above / above average. In which case it has been done before, I'd sugguest a search for "sq subs". You'll find stuff from Adire, RE, Oz, ID, ED, Aura, Rainbow, etc.
Being that SQ is a subjective viewpoint of an individual, until you break it down to reproducing sound in the originally recorded quality as it was meant to be played. You will get a bunch of different options. Your ears are going to be the final test, as to what you like. Maybe a little help from reviews.what are they
maybe w6v2, Ov2, idq
You mean, like this one (shameless plug): http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5794417880&rd=1&sspagename=STRK%3AMESE%3AIT&rd=1Illusion Carbon series
Good list, but take out those Rockfords! //content.invisioncic.com/y282845/emoticons/sick.gif.b1847c8dabbfeeddbcf1a78052249e10.gifHere are some very good SQ subs to look at.
Crystal CMP
Ascendant Audio Atlas/Avalanche
Soundsplinter RL-i/RL-p
RE Audio SE/XXX
Adire Brahma/Tumult
JL W6v2/W7
Alpine Type-X
Image Dynamics IDQ/IDMAX
JBL GTI
Fosgate P2/P3
Diamond TDX
Infinity K Perfect
Whaaaaat? //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gifTits can get VERY loud