Not as loud as the 15" eclipse I had.. but thos etook up 7 vcubes opf trunkspace [IMG]i/expressions/face-icon-small-smile.gif[/IMG]. The amp is quite underrated. putting out easily 800Wrms into 4 ohm. Mind you because the subs are Dual 6ohm..I'm running the amp with a 3 ohm stereo load. In the Recomended 3.0Cu.ft common chamber enclosure with 2 4"x21.4" ports (tuned to 33HZ with Sound qualioty in mind. I'm easily hitting low 130's SPL wise. Sounds very tight and clean as well. Gonna keep this setup till spring. The it's a MMATS 100HC (1000Wrms) and a single 15" Eclipse titanium


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Cheers
Mohawk
A Note too. I now have FOcal Polykevlars in my doors. and no back speakers.