Here’s Roger’s reply to that question.
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Turning directly to your question, understand that both my ESL and Magtech amps use the same special amplifier modules I designed to drive electrostatic speakers. The difference between the two is that ESL amps use a conventional, free-floating, unregulated power supply while Magtech amps use my unique, 100% efficient, linear, regulated power supply.
Magnetic speakers draw tremendous current from an amplifier and that causes the internal power supply voltages to fluctuate wildly and dramatically in response to the music (typically by about 30%). This reduces the power from the amp and causes the distortion and bias to be modulated by the music.
A regulated power supply maintains stable internal voltages at all times. This is a tremendous improvement over a free-floating power supply. All amplifiers should use regulators, but virtually none do because their designers have not figured out how to make a powerful regulator that doesn't waste vast amounts of heat. My regulator is unique in that it runs cold and wastes no heat. I offer virtually the only regulated power supply amplifier on today's market.
Electrostatic speakers operate on voltage, not current. So they don't cause major fluctuations in the internal voltages like magnetic speakers do. But they will still cause some voltage modulation and mains voltage is not stable either. So even electrostatic speakers will benefit from an amplifier with a regulated power supply.
A regulated power supply will provide the best performance, so most of my customers (even my electrostatic customers) opt for the Magtech. I only keep the ESL amp in my line-up because it costs less than a Magtech and so represents a tremendous value. Those customers for whom money is a major concern use the ESL amp instead of the Magtech.
So the answer to your question is that the Magtech amp is the best for all speakers because it not only has the electrostatic amplifier modules, but it also includes a regulated power supply. So unless money is a major concern where the value of the ESL amp is essential, I'd recommend the Magtech.”