I know this is a tough question, but I want to replace the 2 15's that I have in my Sunn with some better / more efficient speakers. I also want to switch the cab from 8 ohms to 4 ohms at the same time. Here's the specs of my cab that I pulled off a website: Sensitivity: 96 1 watt/1 meter Enclosure volume: Vb 7.3 ft3 (2.66 m3) Dimensions height: 41" Width: 25.5" Depth: 17" The front port measures 3.25 X 22.75 (inches) Can anyone point me in the right direction? I know that since it is a ported cab there will be more of a problem finding the right speaker. Anyone? What if I just sealed off the port? Would that make it alot easier to match speakers to the cabinet??