Chandler Limited RS660 Compressor

A Revisited Abbey Road Heritage: From the RS124 and 660 to the RS660

The Chandler Limited RS660 is directly descended from absolute references of the golden age of recording: the EMI RS124 and Fairchild 660 compressors, famous for their smooth yet flattering dynamic control and their ability to "expand" a source without harshness. Rather than aiming for a simple reproduction, Chandler Limited distills this historic DNA into a modern architecture, refining the compression behavior and tonal balance to more effectively recapture the sought-after character of the historic 660s and their evolutions. The result is a tube compressor with a confident, refined, and immediate design, conceived as a true tracking and mixing tool, capable of integrating naturally into a contemporary analog setup.

A Tube Compressor for Premium Tracking, Expressive Mixing, and Mono or Stereo Bussing

The RS660 targets sound engineers and producers who want a compressor that is both "signature" and versatile: it remains discreet when transparent control is desired but can also become a genuine character generator when pushing the input and exploiting the harmonics of the tubes and transformers. In tracking, it excels on vocals to stabilize a performance without freezing it, on bass to add foundation, or on guitar to bring out definition and a sense of proximity. In mixing, it shines on dynamic sources (snare, drum room, brass) and becomes even more interesting in stereo configuration thanks to the Link connection, allowing treatment of a bus or stem while maintaining a stable stereo image.

Three Modes, a 6386 Tube, and Fine Control: From Level to Character

THD: Color Without Compression, From Subtle Grain to Overdrive

The THD mode (Total Harmonic Distortion) is one of the RS660's cornerstones. Here, the goal is not to reduce dynamics but to add deliberate coloration by generating harmonics. Inspired by the approach of the Abbey Road universe's Zener TG1 and TG12413 limiters at Chandler Limited, this mode allows everything from slight thickening (presence, density, a "glue" sensation) to more pronounced textures, up to saturations and overdrives usable in creative contexts. It is a valuable option when you want to "imprint" a sound at the source or add bite to a track in mixing without necessarily engaging gain reduction.

Comp and Limit: From Musical Smoothing to Transient Control

In Comp and Limit modes, the RS660 behaves like a true tube dynamics tool: it can smoothly even out a performance or tame more aggressive peaks with a firmer feel. This dual approach is ideal for moving from comfort compression (vocals, bass, guitars) to more determined limiting (percussion, energetic buses) while maintaining an organic sensation. The VU meter facilitates daily adjustment, and the continuous input and output controls help quickly find the right balance between level, gain reduction, and color.

7 Time Constants and Variable Output Impedance: Tailoring the Response to the Program

The 7 time constant settings provide access to a wide palette of reactions, from slow, enveloping movement to faster action to tame a lively source. Another adaptation tool is the variable output impedance (200 or 600 ohms), which allows fine-tuning the interaction with the downstream chain and the overall feel (bass control, sense of density, presence). In practice, this helps to "match" the RS660 with the rest of the rack and optimize the sound according to the source and context (tracking, summing, bus, console inserts).

Studio Integration: Transformer Balanced, Stereo Link, and Direct Connectivity

Handmade and transformer balanced, the RS660 is designed for demanding environments: controlled noise, comfortable headroom, and robust analog sound. The line input and output on XLR ensure simple insertion into a tracking chain or patch bay, while the Link connection on a 6.3 mm stereo jack allows coupling two units for coherent stereo processing. The 19-inch / 2U format and internal power supply simplify rack installation without the need for external power supplies.

Technical specifications

3 compression modes	THD, Comp, Limit	Variable output impedance	200 or 600 ohms
Variable time constants	7 settings	Height	2U