Two TC sounds made Onyx LS10 10" dual 4 ohm voice coil, 500 rms per coil (1000 rms per sub), requires enclosures sealed as small as .7 or ported as large as 4 cubic foot. I personally like tuning them a bit high to get better numbers on the Termlab, but they're really a "SQL" subwoofer (meaning both qualities of a sound quality sub but with the output of a SPL sub). Very versitile subs and very rare....Onyx was only around for a couple of years and these are probably the last couple of subs in existance in this good of shape.
Ive used these subs only a few times, Ive actually competed in MECA with them once and got a 1st place Sound Quality award as well as a first place in Street 2 with a score of 144.7 db....using a box that was totally wrong for them so you can imagine if you put it in the correct enclosure what they'll do.
$250 firm plus shipping or trade for carputer parts like motherboards or an eclipse head unit with 8 volt preouts
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MECA Car Audio Judge