Intellectually I know that the 660 is good enough, but after all those years envisioning an M80 I know that it'll eat away at me getting a tower that doesn't look like an M80. Yes I know that's juvenile, but you don't know hard I had to work all those many years to wear my wife down to redo the living room to allow space for the towers. So when I realized that about myself and started comparing the curves I was surprised they looked so alike.
"That curve down low has nothing to do with the HP driver. The HP driver only matters when you start pushing the speaker into higher SPLs like I described previously"
In one of the early threads on the HPs Ian says, "The advantage to the High Power versions is ... and the linearity of the bass down to 30 Hz. I took that last part to mean the HPs softened that plateau you see in the M80.
Truth be told I'll probably wind up with the M80, but I have some time to fantasize before I pull the trigger.
