Needs to be 12.5" outside diameter. I'm looking to replace an Image Dynamics IDQ I keep blowing up, I love the way it sounds but just need more power handling. I want a similar sounding sub (IE PSI level 2, Ascendant Audio Havoc) and just concerened about the lowest octaves since it's crossed below 50Hz. Will be going in a 2.35 cubic foot box tuned to 27 Hz, and needs to take an old school JBL bp 1200.1 daily (>1200RMS). Will do straight cash or cash and AudioControl Matrix (6 channel line driver) with cash for trade. Let me know what you have and send links to T/S params.