I own a pair of AV123 MFW15's that still run V2 amplifiers that screech when you power them on then the sounds goes away and they're silent until called to pound out some thump. I honestly thought they would have died by now but they still manage to rumble the floors.
Anybody who knows about these subwoofers (the forum thread I believe was into the hundreds of pages) at a different forum knows they sound fantastic when they work, which for many wasn't for very long.
I had been hoping to afford the "Turbo" upgrade by Motor City Custom audio where they modify a Dayton external amp and it also can come with a very very beefy 15" driver. Unfortunately until recently other things were higher on the priority list.
After purchasing the new Marantz SR7009 I decided to look back into buying the "Turbo" upgrade only to find that Mark Seaton is going to be selling a drop in replacement amplifier that will fit the MFW. The amps are built by the same company that builds his Submersive amplifiers.
I'm ordering two kits (kits include amplifiers, drivers, block off plates and all other hardware), this will take the MFW's to a new level and I can't wait! The MFW's hit pretty hard, these "Turbo" versions should really get the job done.
Here is the link to the new drop in amp.
http://www.seaton-sound-forum.com/post/mfw15-turbo-kits-w-dropin-icepower-amplifier-7812387?pid=1290064591