I got mine 2 summers ago, when they were still MKII's, I believe the MKIII's or MKIV's are out now.

I'm running 2 10" ones right now. They weigh 40#'s each and have over 2" of travel from Xmax to Xmax.

2 15" brahma's in a properly tuned enclosure running about 800-1000Wrms should push most cars into the 150-160 range without an issue. But musically wise, at that volume/enclosure design, it will be a poor music reproducing install, and there will be no such thing as tight bass.

 

you think the bass would be sloppy simply because the woofers are 15"s?

because I have had many 15's and they sure as hell don't sound sloppy... compared to many different 12s and whatnot...

 

No, not just because they are 15's, because in that large of an enclosure the box-induced suspension is skewing the "Q" factor of the enclosure. The "ideal" SQ Q factor of .707 is achieved with a small enclosure with the Brahama's. The larger enclosure loosens up the travel/reaction of the subwoofer.

All basics of enclosure design.

Typically the larger the enclosure the sloppier the bass when compared to an enclosure that matches the subwoofer's specifications. This is even more evident with ported/vented enclosures. Thus the reason you see very few ported/vented enclosures in systems that are setup for Sound Quality.

 

but are you saying that the 15" brahmas in our car would be musically inaccurate?

 

All depends on the enclosure. In a well-style enclosure, sealed with the recommended volume and power, they would absolutly rock just about anything and should sound great.

Put them in a larger ported enclosure, and they will be even louger, but they will be less accurate than in a sealed enclosure.

This is always the big tradeoff from SQ to SPL; and finding a balance that's good for the listener. The SQL subs, like the Brahma, W7, and XXX are bluring the lines even more. They get LOUD in smaller sealed enclosure due to the extreme Xmax travel that they have; but they still stay linear in their movement throughtout the entire range of travel; something rare in the industry.