Re: Electrostatic loudspeakers and suitable output circuits
The ESL989s were designed to be OK with any amplifier from 40 to 100W, the loudspeakers contain a protection circuit and present an almost resistive load. The only way to decide what amplifier is best to drive these is to use your ears. I've owned a pair of these for few years and wouldn't change them and drive them from a EL34 ultra-linear 30W output amplifier.
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