You can purchase new "cans" from Ohm. You can also send your "cans" in to them where one or both drivers can be replaced.
My first "audiophile" speakers were Ohm Walsh 2s and they were terrific. My father still uses his for surround speakers in his HT.
As Zorpman says, they are VERY forgiving of placement - although I wouldn't put them right up against the wall - and especially not right in a corner.
As I recall, they go down into the mid 30s w/o a subwoofer, so I don't know if that's really necessary. They're also relatively efficient. I drove mine with an old Marantz 30wpc receiver (mid 70's vintage. 2230?).
For the small amount of money that it'll cost you to replace the drivers, I'd say it's definitely worth doing. These are great little speakers.