The Brahma was designed as a SQ sub that just happens to have huge SPL capabilities. It's effeciency is fairly low (84 dB for the 12) and really it's designed for very small sealed enclosures. In SPL applications, a ported box would be recommended. The right ported box would also sound great.
I agree with Honkey's recommendation of the Lambda if SQ is your goal. You could get two tens or 12s for the Price of the brahma and end up with much more effeciency than the Brahma. But, if you have 2000w on tap for the sub, by all means, get the Brahma.
