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ESL Virtuoso MK II

Soltanus Acoustics presented the world’s first crossovers multipanel electrostatic loudspeaker, the ESL Virtuoso in 2012.
In searching for the most natural-sounding loudspeaker, we found that one of the most critical points in the music signal path is the crossover. Even the most carefully designed crossovers distort the sound, not to mention the various sound characters of the same electronic components from various manufacturers.
The conclusion was very simple: Lose the crossover!
While it sounds simple, in practice this is not an easy task. It took us years of research and development to design a panel-frame-transformer unity, which gives excellent frequency and phase response. The result is very clear, detailed, fast, and natural sound with low distortion.

The electrostatic loudspeakers are known for their low impedance on high frequencies due to their capacitive behavior.
The first generation of our ESL Virtuoso, suffered this, like any other electrostatic loudspeaker. The impedance minimum was 1.5Ohms at 20KHz.
That makes it a challenge in choosing the right amplifier for driving them.
To satisfy every of our high tasted tube amplifier owners, we had to do research in-depth, on the science of electrostatic loudspeakers.

We found the two mayor factors we had to improve

  • We had to decrease the capacitance of the mid-tweeter panel.
    For that, we developed a panel of four times less capacitance.
    Plus, these new generation panels are built with wires instead of perforated steel plates.
    This fact significantly increases the free open area percentage on the panels, enabling much more easy airflow true them.
    The wires, due to their better aerodynamic behavior, are enabling turbulence-free operation.
  • Also in these new panels we use two times thinner Mylar foil, so with this, we doubled the high-frequency limit above 40KHz.
  • We developed a double audio transformer, but still a crossovers system.
    We use a bigger transformer for bass panels, for a better low-frequency response.
    For the mid-tweeter panel, we use a separate smaller audio transformer, with extremely low parasitic capacitance.

With these modifications we got

  • Four times higher impedance at high frequencies, 6.3Ohms at 20KHz. (Brilliance control at 1 position.)
  • Four times higher impedance at low frequencies, 13Ohms at 20Hz. This is important because of the subsonic noises of the LP records.
  • The high-frequency response is raised from 20KHz to 40KHz.
  • The low-frequency response is lowered from 40Hz to 35Hz.
  • We could add the brilliance control for fine-tuning in the highest frequency band.

Up to all these improvements the back panel slightly changed

  • Now we have only two binding posts, the direct inputs.
  • The tweeter panel Bias control becomes more refined.
  • Because of the higher impedance, we don’t need the damping factor correction circuit anymore.
  • The brilliance control is added for fine high-frequency adjustment, depending on the used audio system and to your taste.


With the new Soltanus Acoustics ESL Virtuoso MK II we have:

  • Better high-frequency resolution
  • Better low-frequency response
  • You have no limitation in amplifier choosing because you don’t need a high damping factor or high current amplifiers.
  • More fine-tuning options.

In summary, you can use most of your tube amplifiers, too.


Frequency Respons


Horizontal Dispersion


Vertical Dispersion

150cm Line Source

High Frequency Transducer

120 x 14cm Electrostatic Transducer (200–40.000Hz)

Low Frequency Transducer

2 pcs. per Speaker, 140 x 16cm Dipole Electrostatic Transducer


equivalent with 87dB/2,83V Speaker on 4 meter.


8Ohms, min. 6.3Ohms at 20KHz

Recommended Amplifier Power

20–100Watts per Channel

Maximum input voltage


Maximum sound pressure


Crossover Components

No Crossover Components


Custom Binding Posts




153cm x 68cm x 5/33cm