Hi all, Have a 3.25 cubic ft, dual flared ports, 3", DOWN fireing cabnit. Tuned to 25hz, with a KG-5150 amp powering it, 150 into 8 and 200 into 4ohms bought threw Menicus Audio. 30hz boost has been removed. Currently no subsonic filter. Any ideas for a replacement 15inch driver that might work? Looking to stay around 100.00 or so, and sub is for HT use only. Tuneing could be changed, subsonic and or boost could be added. I know with this size cabnit, selection of drivers for lowest freq reproduction is limited at best. Maybe some car drvers might offer a better choice. So any ideas.