Driver Unit MK II

The Driver Unit MK II was created to deliver the full emotional intensity of music with uncompromising technical precision, while retaining the compact form of its predecessor, the MK I.

At its heart are hand-wound output audio transformers, engineered with wide bandwidth and exceptional quality. They maintain high impedance across the entire audio spectrum, ensuring effortless drivability with a wide range of amplifiers, while preserving voltage gain and sonic purity even beyond the audible range. Oversized iron cores prevent saturation at subsonic frequencies up to 2,000 Vpp, while minimizing winding capacitance for flawless performance.

The MK II S version adds an impedance switch, allowing adjustment for amplifiers with higher output impedance or specialized low-/zero-feedback designs.

Versatile in use, the unit functions vertically as a headphone stand or horizontally as a conventional amplifier. It features two fully isolated inputs—speaker binding posts for loudspeaker amplifiers and a balanced 4-pin XLR for headphone amplifiers—enabling simultaneous connection of different amplifier types, including bridged or floating designs.

For output, the MK II offers both a 5-pin PRO electrostatic socket and a balanced 4-pin XLR for dynamic or planar magnetic headphones, both active simultaneously. The balanced output includes a rear sensitivity switch with three settings, tailored for headphones of 80+ dB, 90+ dB, and 100+ dB efficiency.

Additional refinements include a low-noise 580 V DC bias supply, precision overvoltage protection (activated above 14 Vrms), and a non-magnetic 3 mm aluminum chassis housing carefully selected, age-resistant electronic components of the highest sonic quality.

Specifications

Frequency response

The same as your amplifier’s response for dynamic output and 4Hz – 60kHz +0, – 3dB for electrostatic output.

Rated input level

14 Vrms max.

Gain Low impedance

34 dB (x 50) for electrostatic outputs.

Gain High impedance

28 dB (x 25) for electrostatic outputs.

Gain Dynamic Output Low sens. Position

-1.6 dB

Gain Dynamic Output Mid. sens. Position

-13 dB

Gain Dynamic Output High sens. Position

-18 dB

Harmonic distortion

0.01% or less (1kHz)

Low Input impedance

30 Ω at 20 Hz

High Input impedance

150 Ω at 20 Hz

Maximum electrostatic output voltage

700Vrms (1974Vp-p) / 1kHz

Maximum output voltages for dynamic or planar headphones

10/2.6/1.5Vrms (28.2/7.3/4.2 Vp-p) /1kHz

Bias voltage

580V DC

Mains voltage

AC100V/ AC110-120V/AC230-240, 50/60Hz (depending on your country’s voltage)

Power consumption

0.1 W/Max

Required amplifier power

To reach 110 dB using electrostatic headphones with a sensitivity of 100 dB/100V, the required power is 1.2W (6 Vrms at 30 Ohms).

Operating temperature

0 to 35 degrees C (less than 90% humidity, non condensing)

Dimension

230 (W) x83 (H) x255 (D) mm (maximum protruding portion included in horizontal position

Weight

4.3kg

Specifications and appearance are subject to change without notice as part of ongoing improvements.
This product is adjusted to the mains voltage according to the requirements of each country.

Owner’s Manual

Download