I did a complete set of TS parameters and everything is dead on. The frequency response is also exactly as advertised--absolutely no breakup that I can see, and except for the baffle step it's flat to 4 kHz, after which it rolls off smoothly. I also measured distortion, and it also seems to be as low as the factory plots shows, although I don't know how accurate my OmniMic measurements are. The bass has great impact on bass transients, but there's a whole lotta port noise on steady tones down in the 30's even with my aggressively flared 2" Precision Port. And for correct tuning, I would have to increase its length, which would make the problem worse. I'll have to think about that one and see whether the passive radiator will be a necessity. Tomorrow I'll optimize my BMR crossover for the Purifi. It's currently designed for the SB Acoustics 6" ceramic, but it works surprisingly well with the Purifi. And then I'll listen carefully and compare it with the Scan 8545 to see whether all these great measurements really make an audible difference.