Glen, if you decide on MartinLogan, especially any of the "new breed", with self-powered woofer sections, I strongly urge you to audition them with a tube amp(s) since the owner's external amp will only be driving the panels. Not too many here (smp excepted) are advocating tube amps with Logans; in fairness, I have to say that in the past (before ML came to their senses and provided well-designed internal SSamp/woofer sections as part of the speaker), a person either had 'to live with' a SS amp to power the whole speaker in order to retain good bass performance, but at the expense (in my ever so humble opinion ;-) of realizing the 'magic' of stats with tubes, OR go to the hassle of bi-amping, which most folks just didn't want to get in to.
Those who chose the former (a single SS amp) were faced with the fact that all watts are NOT created equal. SS watts (especially the 'high' watts they deliver at the low impedances often presented by stat panels) deliver high voltage in those watts, but not the high amperage (current) electrostats need. The result was that owners who powered the earlier hybrids with a single SS amplifier, found they needed a really powerful SS amp to get the current the panels needed -- a much larger amp, in fact, then would have been necessary just for great woofer control.
With the newer Logans, the speaker comes "pre bi-amped" so to speak, and the owner is free if he/she so chooses, to power the speaker (just the panel itself actually) with a quality tube amp which will preserve the delicacy of the audio signal to a degree that few (some would say none) of the SS amps can do.
In addition, a really mega tube amp is not needed because tube amps are the opposite of SS amps, in that they deliver lots more current (for each watt of output) than SS amps do. And of all tube amp designs, McIntosh tube amps are the current champions. This is because of a little feature that no one seems to understand or pay much attention to: the "Unity Coupled Circuit" invented by Frank McIntosh himself! Because of this exclusive circuit design, McIntosh tube amps are current-controlled instead of being voltage-controlled, as in conventional tube amp designs. 100 - 150 watts/ch of McIntosh tube amp power is sufficient to drive any of the current ML speakers. In fact, for the debut of MartinLogan's new full range, all electostatic CLX, at the Munich audio show last year, guess what MartinLogan was driving them with? McIntosh tubes!! :thmbsp:
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