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RS660 Compressor

The Chandler Limited RS660 Compressor builds upon the technological advancements that began with the historic EMI RS124 and Fairchild 660 compressors used at EMI’s Abbey Road Studios during the 1960s, and distills them into a refined and elegant compression circuit…that is the ‘RS660 Compressor.’

Rather than a reproduction of existing equipment, the RS660 Compressor stands apart and represents a path forward in the recording engineering development department.

Built around the 6386 vacuum tube, the RS660 Compressor is meticulously tuned for a sound, and the result is a more efficient means to achieve the desired characteristics of the historic 660 and beyond.

Capable of taming an array of dynamic sources from sensitive vocals to explosive drums, the RS660 Compressor and limiter is at home alongside the historic units from which it was hewn and adds to the modern engineer’s cache of analog signal processors.

The Chandler Limited RS660 Compressor is a handmade, mono/linkable, transformer-balanced valve (vacuum tube) compressor and limiter, packaged in a dual rack space configuration with an internal power supply.

The Chandler Limited EMI Abbey Road Studios RS660 Compressor’s feature-set includes: Input, Output, Time Constant, THD, Comp, Limit, Link and selectable Output Impedance.

Stereo matched pairs and stepped I/O controls are optionally available.


Technical Specs




Valve — 6383, 6CG7, 6AL5


XLR, Transformer Balanced

Output Impedance

Selectable, 200/600 Ω

Input/Output Control

Continuous (Stepped Optional)

Time Constant

7 Positions, Stepped


THD, Comp, Limit

Stereo Link

Switchable, 1/4" Jack


Internal, Wired for Region — 110-120V/220-240V




Chandler Limited is the only company in the world authorized to develop, manufacture and market the “Official Equipment” of EMI/Abbey Road Studios.

RS660 Compressor

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