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Sonoma Model One headphone system

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Dr Pan K
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Sonoma Model One headphone system

Unread post #1 by Dr Pan K » Tue Oct 11, 2016 11:02 pm

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Introducing the Revolutionary Model One Headphone System From Sonoma Acoustics

Long before the appellation of Hi-Res Audio even existed, a professional recording system called Sonoma was raising the bar for audio quality in ways that would define the entire category. Today, with literally thousands of hi-res recordings to its credit, Sonoma workstations are still busy capturing projects for the most discriminating artists around the world.

Now there is a brand new Sonoma, only this one is not for recording but for playback. Introducing the Sonoma Model One Headphone System, the world’s first headphone system designed from the ground up to be optimized for hi-res audio playback.

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HPEL Transducer

The ideal loudspeaker transducer would have zero mass, respond infinitely quickly to any signal, be perfectly damped, have no distortion and be perfectly linear. Until now, the technology that best exemplifies those characteristics is electrostatic. Introduced almost 60 years ago, electrostatic headphones have remained the choice of discerning listeners who demand the highest audio quality. Now, a revolutionary new electrostatic transducer, derived from the world of ultrasonics, has been developed in the UK by Warwick Audio Technologies Ltd. (WAT). The patented High-Precision Electrostatic Laminate (HPEL) audio transducer ushers in a new paradigm in the field of electrostatic drivers, and the Sonoma M1 is the first headphone system in the world to use it.

A conventional electrostatic transducer consists of a thin membrane (coated with a conductive material) between two electrically conducting metal grids. There is a small gap between the membrane and grids. The membrane is kept at a high DC potential relative to the grids, and the audio signal is applied across the grids. This results in the membrane moving in response to the audio signal thus creating sound. Clearly, in order for the sound to propagate through the grid/membrane ‘sandwich’, the grids have to be perforated in some way.

In contrast, the HPEL uses a thin (15 μm – less than the thickness of a human hair), flexible laminated film for the ‘front’ grid. The laminate is affixed to the open (cell) structure of an insulating spacer (made of Formex™), and the film is very accurately machine-tensioned in the x y plane. In this way, small ‘drum-skins’ are created by the cells. A stainless steel mesh forms the ‘back’ grid. When the audio signal is superimposed on a 1350 V DC bias voltage, the ‘drum-skins’ formed by the flexible ‘front’ grid vibrate, producing sound. Unlike a traditional electrostatic panel, the sound you hear from a HPEL does not pass through a grid! To take full advantage of this feature, everything has been done in the design of the M1 to keep the areas in front of and behind the transducer as clear as possible so as not to impede the sound waves.

Injected Magnesium Ear-cups

Handmade ‘Cabretta’ Leather Ear & Headband Pads

Custom Low-Capacitance Cable

Discrete Single-Ended Class-A Amplifier

ESS SABRE Reference DAC


AKM 32‑bit/384 kHz Premium ADC
Due to the need for DSP to achieve the target frequency response, all incoming analog signals must first be converted to digital. This is undertaken in a multi-channel 32‑bit/384 kHz AKM Premium ADC chip.

Crystek Ultra-Low Phase-Noise Oscillator
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