Years later, still not much on these. I almost purchased Rocketfish before coming across this. Purchased the Amphony L1520 wireless transmitter and amplifier from Sewell Direct, open box. Just received these and installed 2 days ago, so can't comment on durability. Can say: works exactly as advertised. No extraneous noise, interference, hum, etc., with source either on or off. I can't really comment on sound quality, except to say that when hooked up as secondary pair of speakers, they sound exactly like main pair (identical Infinity bookshelves). Works great as a surround solution. They are driving my 8ohm 86db Infinitys without complaint. Amp power is at 50% and transmitter close to 100% to balance sound level. I have no other 5.8ghz equipment and am semi-rural, so can't comment on how they respond to interference. I love this so far--it is everything I hoped for. And yes, the amp requires a 24volt power supply and wires to the rear speakers, or two power supplies in the case of 1550.