Gyratec XXII "G22"

Stereo/Dual/MS vari-mu Compressor

Photo by Engedal fotografi - clic pic for a larger version

Gyraf Audio Gyratec XXII "G22" Stereo/Dual/MS vari-mu Compressor...

G22 is an elaborated and dualified version of our venerable G10 vari-mu compressor. It can be set to dual-mono, but still keeps a backwards-compatibility "G10 mode" where one set of knobs controls real stereo, like you'd want most of the time in mastering.

The audio part of the circuit is a faithful reproduction of the G10 that has been our flagship for more than 15 years - if it works, don't fix it. The only minor change is a re-bias of the output stage, which allows some 4-5dB more headroom while preserving the original stage's soft transition into overload.

Some changes has been made to the sidechain functions, including a wider threshold range (to allow S compression in weak-S M/S-mode) and even faster fastest attack time (because we can, it's a vari-mu you know...)

A simple sidechain high-pass filter was added (located on the bypass switch) which cuts off compressor keying below ca. 80Hz at a slope of 6dB/oct. This mainly to keep pumping artifacts under control when working fast in bass-heavy material.

Input and output transformers can be switched between standard two-channel L/R mode and the M/S mode where both matrixing and dematrixing done is internally: M/S mode allows you to independently control dynamics (and levels) in mono and side parts of program material and still have the result on the output as standard stereo information.

Linking/dynamic interaction between channels in dual-mode can be set continuously from none to full by the Vari-link control knob - enabling you to dial in a difference in channel processing, and then varying difference amount in a simple mode. When initially getting to learn the unit, I myself was amazed how intuitive this control worked.

Bypass is, off course, hard and relay-based. You bypass, G22 acts only like an additional piece of cable.

The G22 is as standard available as 230V or 115V mains voltages - Please specify when ordering

Jakob E.

G22 Preliminary User's Manual