The Trevoce12 EQ DSP does this all without any increase in the size of the sub. At less than the size of a 16-inch cube, this is one of the smallest triple 12 inch subs available. Additionally, we have kept the iWoofer DSP engine as well. From your seating position, using the Android or Apple App you can make any adjustment needed to get the maximum out of your system. Amongst other things, this this allows you really fine-tune your subwoofer, carefully matching the main speakers to the sub, using variable slopes and role offs. Whether you have ported main speakers, needing 24 or even 48dB per octave filtering, or sealed acoustic suspension speakers needing 12dB per octave filtering, we have you covered. The infinitely variable phase correction and choice of cross-over points also provide for much better integration with the main speakers.