Not to take this thread too far off track, but can you share some more info about your experience with the REL's? I've been considering getting a pair of 1508's to replace an aging Velodyne DD15. What speakers do you have yours paired with? I'd be pairing them with 11A's for dual duty 2-channel music and multi-channel HT.
Here are the speakers that are paired with my REL HT/1508:
Martin Logan Electrostatics:
2) ReQuests Front Left, (2 for double surface area & power handling capability)
2) ReQuests Front Right, '' '' '' '' '' '' ''
2) Logos Center (one above / one below 12' screen to achieve center of screen sound effect).
2) SL3 R & L Rear;
2) Stylos: R & L Front Side
2) Stylos R & L Rear Side
Atmos:
2) Paradigm CI Elite E65-R Front / Mid Ceiling
2) Paradigm CI Elite E65-R Mid / Rear Ceiling
Subwoofers:
2) REL HT/1508 Left Front - XLR Connected
2) REL HT/1508 Right Front- XLR Connected
1) REL HT/1508 Left Rear- XLR Connected
1) REL HT/1508 Right Rear- XLR Connected
I purchased & used these subwoofers before choosing REL:
Velodyne ULD 15 Servo Sub (fair low frequency excursion; but not a good pairing with Martin Logans).
Velodyne ULD 18 THX Servo Sub (great low frequency excursion, but not a good pairing with Martin Logans: too slow response).
Sunfire True Sub (12", 1000 Watt by Bob Carver). (Very fast response; mid bass pairs well with Martin Logan, but needs more attack).
Infinity Sub (10" - do not recall the model #). (Very fast, but seriously lacks low frequency excursion).
REL HT/1508 Performance is beyond words. (Ultra fast response that is amazingly faster than most 12" subs; attack that will shake you in your reclined theatre seat; extremely low frequency excursion; accuracy in frequency response; blends seamlessly with Martin Logan). I suggest you look for HT/1508 and grab them if you can find any remaining on sale, because REL tweaked the design slightly & replaced them with the HT/1510. It is important to note that the HT/1508 can be connected with a variety of options. I chose XLR my existing Anthem AVM 60 to all subs (& Krell FPB Amps) for lowest loss & hum elimination. The REL sub below this model does not offer XLR connectivity.