Charles, glad that you enjoyed your demo with the Logans. Myself a long time fan of stats (currently listening through M/L Spire's) know full well the magic of a properly set up pair of electrostatic speakers. I further augment the bass of my Spire's with a Velodyne DD-15 sub. Amplification is a pair of Rogue M-180 mono blocks and or my Plinius SA-102 (just depends on my mood).
While 'bsand' is correct in being able to drive the current line of hybrid models with lower powered amps one still needs to be aware of the capacitive loading and reverse imp dip of stats. With that being said, lesser designed (narrower bandwidth) tube amplification will have a rolled off effect on the upper freq.
If you want more insight on all things 'Logan' visit the gang over on the Martin Logan Owners forum as well.
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