Did anyone read the spec sheet? These babies are 96db efficient and the specs call for an amplifier of up to 500 Watts. 
What the heck are you going to do with 500w running into 96db speakers???? Use them to knock down buildings? 
You just gotta love the marketing folks...... 
I know what you mean. But the specs can be misleading sometimes. They only say 96dB/W/m at 8ohms. They don't say the minimum impedance at what frequency or the associated phase. I had Legacy Focus which was 96dB, but 1.9ohms at 70Hz, with 60 degree phase shift. 500 watts made them come alive but I still enjoyed them with 50W tube integrated. In this case, two low distortion woofers in reflex (low Q?) with potentially complex passive crossover filter, I would not be surprised if it actually dips to 3 ohms at 70Hz with a bit of phase angle too, although JBL guys know to minimize those negative aspects so it's probably a mild load. Trying to play a symphonic peak or a movie effect or a rap song at "shake her pants off" levels, maybe 112dB would still ask for 500W in a heartbeat. Plus you want some headroom to keep the harmonic distortion low and the dynamic feel high. IMO, more output devices reduce the output impedance for better bass detail, that why bigger amps sound more confident and authoritative even at low levels. More output devices means higher power rating, but that's a secondary benefit to the bass control. Looks like JBL is marketing their 200W Lexicon amp with them, bridgable to 800W mono. I wouldn't mind hearing them with the 50W
Mastersound 845 monos.
Ed, that sounds awesome. I have a track of tony williams that I like to use to evaluate a speaker, because it has such a great birch drum kit tone, and those dark rich Zildjians from the 60s. That's where the high efficiency comes in, they seem to be able to lay out the details easier. Detail is effortless, not forced. Are your JBL speakers relatively high efficiency also?
