15" subs arent faster or slower than 10", 12", 8" or any other size subs. They also dont "take up" more power. Some do, some dont. There are low powered 15's around. Power handle is not a function of sub size. RMS is only a suggestion not a requirement.
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HU: ///Alpine 9887, KCE-400BT, KCE-433IV, KTX-100EQ Imprint, 8Gb iPod Touch
Front Mids: Eclipse SC6500
Front Tweeters: Morel made Xtant 28MM Silks
Subs: Audiomobile Evo 10" TC2+
Enclosure: 1.1 Cubes sealed with 10 Ounces Poly Fill
Amp: Audio Systems Twister F6 380 III
I live close to sudden impact real close lol
It's all about the best possible install you can do with the space you are willing to give, not the size of your woofers bud.
Hu: kenwood kdc-x995
Sub: Boston acoustics G5 12 in a quasi 6th order
Amp: Eclipse Xa5000
Front Speakers: Eclipse sc6500
HIT UP FOR BASS ---> http://www.youtube.com/user/BassWithMurph?feature=mhee