From this diyAudio thread: https://www.diyaudio.com/community/threads/quad-esl-57-impedance-plot-and-ltspice-model.386355/
An SE amplifier typically has a highish rout[/out] and that interacts with the impedance. That is issue 1.
Second issue is: how well does your amplifiwer drive a capacitor. Note the phase angle curve.
friend has triple QUADs.
He drives them with 3 amplifiers built on LEAK stereo PP EL84 amplifiers.
dave
I have used many amps on the ESLs, Marantz 8b, 2 , 5, Citation II, Berning ZOTL ZH270, Bedini 25/25 and a Wyetech 211 SET. I also use Futterman H3 and have just acquired a pair of Futterman H3aa's that will be up next.
The Wyetech 211 SET is a fabulous match for the ESLs- one of my favourites. I'm not sure a 300b would do the ESL justice.
My experience with the ESL is that stacking just causes a bunch of other potential problems and complexity. The best advice I have is to have the ESL professionally refurbished from a panel perspective and you will be very happy.
The Wyetech 211 SET is a fabulous match for the ESLs- one of my favourites. I'm not sure a 300b would do the ESL justice.
My experience with the ESL is that stacking just causes a bunch of other potential problems and complexity. The best advice I have is to have the ESL professionally refurbished from a panel perspective and you will be very happy.
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Are you putting your 211SE on stacked Quad ESL-57? Looks like the 211 amplifier is driving a single ESL-57.
I think I am in the minority - but I have run many amps with my stacked quad 57s over the years. I don't believe they need as much power or impedance matching as you would read about. As an example I am using a small EL84 PP amp with them at present, about 8WPC driving them wired in parallel. I'm not using them very loud, but then I don't think you would be using 57s at party levels anyway. To put it in context though, you would need need to raise your voice quite a bit to talk to someone over music, so loud enough I think for most listening.