What exact problems are they having?
If the foam is shot, you could try contacting Madisound, or even the guys who specialize in speaker surrounds on Ebay, and see if they have any leads on the size you need. The relevant dimensions are the overall diameter (15" I assume), and the diameter of the foam "roll" - probably about 1"?.
The most common amplifier problem with these is overheated/shorted output transistors. The symptom of that is the fuse blows instantly when you turn the amp on - whether or not it's connected to the sub. Any electronic repair shop should be able to replace them, but it won't be all that cheap as it's a somewhat involved job.
The servo circuits can be fried easily if the servo cable is removed while the sub is playing - a serious design flaw. If that is the case, you may be out of luck.
That's about all I know. Keep in mind if the driver itself is fine, you can run these as "normal" subs with any powerful amplifier - you won't have the servo control, but it should sound as good as a similar non-servo unit.
If the foam is shot, you could try contacting Madisound, or even the guys who specialize in speaker surrounds on Ebay, and see if they have any leads on the size you need. The relevant dimensions are the overall diameter (15" I assume), and the diameter of the foam "roll" - probably about 1"?.
The most common amplifier problem with these is overheated/shorted output transistors. The symptom of that is the fuse blows instantly when you turn the amp on - whether or not it's connected to the sub. Any electronic repair shop should be able to replace them, but it won't be all that cheap as it's a somewhat involved job.
The servo circuits can be fried easily if the servo cable is removed while the sub is playing - a serious design flaw. If that is the case, you may be out of luck.
That's about all I know. Keep in mind if the driver itself is fine, you can run these as "normal" subs with any powerful amplifier - you won't have the servo control, but it should sound as good as a similar non-servo unit.