Sonoma Acoustics - Model One Electrostatic Headphone System

Sonoma Acoustics



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"If you are in the market for a superbly neutral, revealing headphone system for critical listening or monitoring purposes, the Sonoma Acoustics M1 should be near the top of a very short list." — The Absolute Sound, October 2017

"Sonically, and regardless of the recording that I've used, I've found that the Sonoma Acoustics Model One delivered the goods at the highest level. Their open-back design and ultra-low-weight HPEL membrane lead to killer transparency. That's one of the major strengths of electrostatic designs, but hell! This is extraordinary." — David W. Robinson, editor-in-chief, Positive Feedback Online. Read David's entire review here.

The Sonoma Model One Electrostatic Headphone System

The revolutionary Sonoma M1 Headphone System has been optimized for today’s High-Resolution Audio formats. Every aspect of the system has been designed to deliver unparalleled levels of performance and sound quality.

New Transducer Technology

The M1 Headphone System is the world’s first headphone to use a High-Precision Electrostatic Laminate Transducer (HPEL) developed by Warwick Audio Technologies Ltd.  This patented technology ushers in a new paradigm in electrostatic transducers offering all of the benefits of traditional electrostatics, but manufactured with unprecedented consistency and matching between transducers.

Injected Magnesium Ear-Cups

With excellent strength-to-weight ratio, high stiffness, superior acoustical dampening and outstanding RFI/EMI shielding, magnesium is the perfect material in which to house the HPEL to ensure optimal performance. Low weight also contributes to outstanding headphone comfort.

Handmade Cabretta Sheepskin Ear-Pads

To ensure your comfort during long listening sessions, our ear-pads and headband are handmade from the finest Cabretta sheepskin leather, known for its light weight, durability and softness.

Custom Low-Capacitance Cable

In collaboration with Straight Wire inc,  we have developed a special ultra-low capacitance cable with high precision, self-latching connectors to guarantee ideal signal transfer between amplifier and headphone.

ESS Sabre Reference DAC

Two stereo DAC chips from ESS, the world’s premier DAC chip manufacturer, are operated in mono mode to provide a measured 129 dB signal-to-noise ratio.

Precision CNC-Machined Aluminum Case

A precision CNC-machined, solid aluminum case not only creates a beautiful housing, but provides outstanding isolation from external interference sources.

Class-A Energizing Amplifier

A discrete, single-ended FET Class-A amplifier provides a high-performance, wide-bandwidth, very low distortion final drive stage, optimally matched to the HPELs.

Custom 64-bit DSP

All input signals are digitally processed using custom 64-bit double-precision fixed-point arithmetic. Fixed-point is known to be superior in the world of audio processing, and our 64-bit arithmetic exceeds the performance of most professional audio workstations.

"One hell of a story here. Interesting roots in a buncha places," read the full review, here.


The Headphone


  Open-back, circumaural type
Transducer HPEL, single-ended electrostatic
Effective Diaphragm Area 3570 mm2
Frequency Response 10 Hz – 60 kHz
Output Level Compliant with EN 60065/A12:2011 (EN50332) when driven by M1 Energizer/DAC (for all inputs)
Ear and Headband Cushions Cabretta top-grain, sheepskin leather
Input Polarized, 4-pin, self-latching connectors for left and right channels
Drive Cable Ultra-low capacitance, silver-plated OFHC copper, with  foamed PE insulation and Kevlar reinforcement; 2 meter length

303 grams (10.7 oz), without cable



DAC & Energizer

USB Input

  USB 2.0, type B; accepts digital audio formats up to 32-bit/384 kHz PCM and DSD via DoP (DSD64/DSD128)
Digital Coaxial Input S/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
DAC Dual mono, 32-bit/384 kHz DACs with balanced outputs
ADC 32-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/Energizer Discrete FET, single-ended, high-bias Class-A output
Distortion + Noise < 0.05%
Bandwidth > 65 kHz
Enclosure CNC-machined 6063 aluminum
Power Supply External: 24 VDC, 60 VA, fixed frequency, class B-compliant SMPS;
Internal: fully isolated, ultra-low noise linear regulation
AC Mains World voltage compatible (90-264 V, 50-60 Hz); IEC-60320 C14, earth-grounded power cable; 1.5 meter length
Dimensions H x W x D: 57 mm (2.24 in) x 190 mm (7.48 in) x 290 mm (11.42 in)
Weight 2.45 kg (5.40 lbs)

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