I have two (2) REL S/3 subwoofers for someone with desire and acumen. I bought them new from Music for Pleasure in July 2015 for $1700 apiece, along with the upgraded Bassline cables for an additional $425 a pair.
One of the subs quit working recently, and I upgraded to a pair of S/510s. I checked the fuse...it's okay. Music for Pleasure can coordinate repair from REL estimated around $600 - $700. The other seems to have weakened output.
So...if you have a mind to do the sleuthing and/or repair, they are free if you don't need the upgraded cables. Includes manual, original boxes, power cords. Piano black. Cabinets are in great shape except for a small tear in the corner of one grill cover.
If you'd also like the upgraded Bassline cables, I'd like $125.
Happy to provide more info.
Pickup in St Louis area only.
Thanks!