Enjoy ultra-low distortion, wider bandwidth and increased SPL. The Sonoma Model One headphone system was the first to use our patented High-Precision Electrostatic Laminate (HPEL) audio transducer, a revolutionary development in the field of electrostatic drivers.

Unlike conventional transducers, the HPEL uses a laminated film that is just 15 microns thick (several times thinner than a human hair). The film is affixed to a cell structure and machine-tensioned with extreme accuracy to create small, sound-producing drumskins. Our software then finetunes each drumskin for optimal resonant frequencies.

To ensure the exceptionally lightweight transducer can perform as accurately as possible without the risk of bending, the panel as a whole is encased in a super-rigid polycarbonate 'cassette'.

An electrostatic headphone presents an out-of-the-ordinary load to the amplifier. So you need an out-of-the-ordinary cable to connect the two. We collaborated with Straight Wire Inc. to develop a bespoke lightweight design for the Sonoma M1 that maximises signal purity and achieves capacitance of an ultralow 50 pF/m.

The cable is composed of very fine strands of silver-plated, oxygen-free high- conductivity (OFHC), ultra-pure copper. The insulation is a foamed polyethylene chosen for its high dielectric constant. Two Kevlar® fibres are woven in to ensure excellent strength. There is no shared ground between the left and right channel signal cables, and a fibre filler material in the jacket keeps the conductors as far apart as possible (to reduce capacitance and crosstalk).

The jack is electrically isolated from the amplifier chassis while high-precision self-latching connectors ensure a secure connection at the headphone end. If the cable is disconnected, the amplifier automatically shuts down.

The BRAVURA has an easily adjustable headband with a hand-stitched finish, so you can listen comfortably for as long as you like. The design was based on the luxurious and ultra-comfortable / ultralight APERIO headband.

The system uses a high-voltage, high-performance amplifier that is optimally matched to the HPEL. It is specifically designed to drive the inherent capacitive load of an electrostatic transducer and operates at a high bias level to improve linearity.

To cope with the power levels produced by the amplifier's high voltages, we use high-quality devices throughout along with passive components optimised for their application in the electronic design. The amplifier is encased in a completely shielded, machined aluminium enclosure.

Digital inputs

• USB 2.0
• Coaxial S/PDIF

Analogue inputs

• 2 high-level RCA jacks
• 1 low-level 3.5mm stereo jack

The amplifier uses the 32-bit Sabre Reference DAC from ESS Technology, which is the globally recognised gold standard of audio digital-to-analogue converter technology. Two stereo DAC chips are used in a special mono mode to deliver a measured 129 dB signal-to-noise ratio.

For the Sonoma M1, we digitally process all signals using custom 64-bit double-precision fixed-point arithmetic, running within a multi-core XMOS processor. The resulting performance exceeds that of most professional audio workstations. We've also introduced a fully digital interpolated volume control in the amplifier, which eliminates clicks, pops and other noise issues and ensures there is no loss in fidelity or dynamic range.

The Sonoma M1 amplifier case is built for beauty, strength and audio performance. We start with a solid billet of high-purity Aluminium 6063, which is extruded and CNC-machined to produce the base and side walls. A top plate and end plates are added to form the case. A special 3D-wave pattern is then cut into the base and top plate to facilitate heat dissipation. The machined parts are blasted under high pressure with fine glass beads before being clear-anodised to obtain the desired finish. All logos and labels are laser-etched into the metal so they will not fade or rub off.

Two colour ways: silver or special edition black. Or select a combination of the two.