The question posed by @tomic601 was the exact one Roger Modjeski asked when a potential Music Reference customer inquired about the suitability of one of Roger's amps for use with a given loudspeaker. He advised taking a SPL reading at the preferred listening level, a measurement of the amp's output voltage at that level, then extrapolating the required increased power requirements for every 3dB of added SPL.
I have been conversing with a fellow Eminent Technology LFT-8b owner, who has been marveling about how well his moderately-powered tube amp (I do not recall the amp, but it's under 100w/ch) drives the 83dB sensitivity LFT-8b. That's the same sensitivity as that of Maggies, which require and benefit from a high current amp. Sensitivity alone tells one only so much about a loudspeaker.
Maggies are a nominal 4 ohm load (dropping to 3 ohms at some frequencies), the LFT-8b 8 ohm. And if you bi-amp the ET (the speaker is fitted with dual binding posts, one for the m-p panels the other for the sealed box dynamic woofer), the magnetic-planar drivers present an 11 ohm load to the amp, great for tubes. By the way, the owner prefers the LFT-8b to the Maggie 3.7 he previously owned. The most under appreciated, under-acknowledged loudspeaker on the market. $2499/pr. VPI's Harry Weisfeld declared the LFT-8b to have the best midrange he has ever heard, regardless of price. Yet it continues to be ignored by most. Brooks Berdan chose Eminent Technology as his shops' magnetic-planar loudspeaker.
I have been conversing with a fellow Eminent Technology LFT-8b owner, who has been marveling about how well his moderately-powered tube amp (I do not recall the amp, but it's under 100w/ch) drives the 83dB sensitivity LFT-8b. That's the same sensitivity as that of Maggies, which require and benefit from a high current amp. Sensitivity alone tells one only so much about a loudspeaker.
Maggies are a nominal 4 ohm load (dropping to 3 ohms at some frequencies), the LFT-8b 8 ohm. And if you bi-amp the ET (the speaker is fitted with dual binding posts, one for the m-p panels the other for the sealed box dynamic woofer), the magnetic-planar drivers present an 11 ohm load to the amp, great for tubes. By the way, the owner prefers the LFT-8b to the Maggie 3.7 he previously owned. The most under appreciated, under-acknowledged loudspeaker on the market. $2499/pr. VPI's Harry Weisfeld declared the LFT-8b to have the best midrange he has ever heard, regardless of price. Yet it continues to be ignored by most. Brooks Berdan chose Eminent Technology as his shops' magnetic-planar loudspeaker.