Get a DD-15.
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Shadorne, are you talking about more low frequency extension or sheer output?
Output at low distortion. Bigger is better. FWIW - the SVS PB13 is exceptional at low distortion at ultra low frequencies due to the ported design (great for movies), however, I think you'll find you want to plug those ports for music - and the DD-15 will give your more musical bass drum slam output between 40 and 80 Hz...