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Join Date: Oct 2003
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sounds like a very nice setup.
tough to say exactly what is causing the "bass from behind" effect.
in 3.5 cubic feet sealed, with about 600 watts into 4 ohms (that's about what that amp will do per channel), either the si 18 or the Dayton 18 will both be at about 15mm excursion at 20hz, so nothing to worry about with either of them.
if you can get the si 18 in dual 4 ohm and wire it for 2 ohms, you might get a little bit more power out of the amp, but probably not a ton more running 2 ohms stereo.