The Headphone

ConfigurationOpen-back, circumaural type
TransducerHPEL, single-ended electrostatic
Effective Diaphragm Area3570 mm2
Frequency Response10 Hz – 60 kHz
Output LevelCompliant with EN 60065/A12:2011 (EN50332) when driven by M1 Energizer/DAC (for all inputs)
Ear and Headband CushionsCabretta top-grain, sheepskin leather
InputPolarized, 4-pin, self-latching connectors for left and right channels
Drive CableUltra-low capacitance, silver-plated OFHC copper, with  foamed PE insulation and Kevlar reinforcement; 2 meter length
Weight303 grams (10.7 oz), without cable

DAC & Energizer

USB InputUSB 2.0, type B; accepts digital audio formats up to 32‑bit/384 kHz PCM and DSD via DoP (DSD64/DSD128)
Digital Coaxial InputS/PDIF; accepts digital audio formats up to 24‑bit/192 kHz PCM
Analog Input (High Level)Dual RCA; 2.1 Vrms
Analog Input (Low Level)3.5 mm; 850 mVrms
DACDual mono, 32-bit/384 kHz DACs with balanced outputs
ADC32-bit/384 kHz multi-channel ADC with balanced input buffers
Digital Signal Processing (DSP)64-bit (double-precision) fixed-point processing at native sample rates
Amplifier/EnergizerDiscrete FET, single-ended, high-bias Class-A output
Distortion + Noise< 0.05%
Bandwidth> 65 kHz
EnclosureCNC-machined 6063 aluminum
Power SupplyExternal: 24 VDC, 60 VA, fixed frequency, class B-compliant SMPS;
Internal: fully isolated, ultra-low noise linear regulation
AC MainsWorld voltage compatible (90-264 V, 50-60 Hz); IEC-60320 C14, earth-grounded power cable; 1.5 meter length
DimensionsH x W x D: 57 mm (2.24 in) x 190 mm (7.48 in) x 290 mm (11.42 in)
Weight2.45 kg (5.40 lbs)