Focusrite Red 3
A dual-channel VCA compressor and limiter with transformer-coupled ins and outs. It gave the Red Range its studio reputation, and it later got modeled into plug-ins.
Overview
The Red 3 is the third module in Focusrite's Red range of signal-processing modules. It keeps turning up in the conversations of engineers who mix for a living. It's a two-channel compressor and limiter, and Focusrite built it with transformer-coupled inputs and outputs. That matters if you're after the particular weight and interface behavior that transformers bring to a signal path.
The compression section runs on the Focusrite VCA, the same device found in the earlier ISA 130 and ISA 131 Focusrite Dynamic modules. That lineage is worth noting for anyone trying to place the Red 3 in the company's design history: the VCA wasn't invented for the Red line, it was carried over from the ISA dynamics work. The compressor's attack is continuously variable from 300µs to 90ms, and release runs from 100ms to 4S — a wide enough window that the same unit can grab a snare transient or ride a vocal over an entire take. Makeup gain is variable from 0dB to +20dB.
The limiter is separate from the compressor, with its own sidechain circuitry and its own threshold control, switched from 0dB to +18dB in 1.5dB steps. The limiter can be set to catch peaks while the compressor does the musical work, without the two fighting each other. Two illuminated analog VU meters display either the output signal level or the gain change, so you can watch what the unit is doing rather than guess.
When the Red 3 was announced, Focusrite's own advertising billed it as "the ultimate limiter/compressor," arriving at Focusrite distributors worldwide in October 1993 (Studio-Sound, November 1993, p.47). That's marketing copy, not a verdict. The company was also explicit that the Red 3 offered two discrete channels or matched stereo operation from one set of controls. The Red Range as a whole was pitched to recording engineers as a family of products meant to make the recording process more creative and enjoyable. The transformers were singled out in that pitch as the means of eliminating ground loops and digital noise artifacts at the interface.
By the late '90s Focusrite was running ads under the banner "Accept no substitutes," thanking imitators sarcastically and reminding buyers that the Red 3 was "the choice of professionals the world over." Copies were apparently worth warning about. One mixing engineer quoted in a period interview described using a Red 3 on the two-bus, saying it was "not pounding it all - just breathing on it," employed more for color and a little compaction than for heavy gain reduction.
The Red 3's reputation outlived its hardware production by a wide margin. Focusrite later modeled it in software, and by 2015 the Red 2 & Red 3 Plug-In Suite was being bundled free with the company's audio interfaces for registered customers, and sold separately for $299.99. The plug-ins were described as accurately modeled on the classic Red 2 EQ and Red 3 compressor, with 64-bit AAX, AU, and VST compatibility. Focusrite also carried the Red 3's compressor topology forward into other products. The OctoPre's single-dial, VCA-based compressors were derived from the Red 3, with the shape of the Red 3's knee reportedly matched to capture the character of the classic studio compressor.
Physical condition, service history, and current market pricing for the hardware are not documented in the available material, so a buyer should verify those with the seller rather than assume. What is documented is the design: transformer-coupled I/O, the ISA-derived VCA, an independent limiter section, and a control set built for stereo work from a single set of controls.
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