The little Aura 1" is interesting. Around 45 of these per side will be approx 500$, which is a bit cheaper than the RD75. The xmax of these thing is quite amazing, but I am still a little bit skeptical about how clean they sound close to 300hz... Do you know of any independent tests of these little things?Now, wiring 45 drivers is a little bit more work than wiring 1 driver though...;-)