greatest sub for the money ever, I had my RLP-15 in 2.0 cu. ft with 1000 watts in a trunk and it slammed, and had sq. I am old school and have owned and tested most of it out there from DD to JL and it has great combo of both
I have my 15"s in a 7.3 cu (6 after dis.) box. They only need about 2.5 per. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif
I just installed 2 15's in 2.5^3 each @30Hz running off a SAZ-1500D. Awesome daily driver subs, sound good loud or quiet and when I'm in the mood get STUPID loud when I crank them up. But they stay clean even at those volumes. I've had 2 people tell me they're too loud, no such thing of course. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
With your power I'd say go with the 2 15's. BEST decision I've made lately //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif