SOLID STATE LOGIC BUS Comp Classic | Vca Compressor | 1u

Bus Comp Classic

2-Channel VCA Compressor

Bus Comp Classic is a 2-channel stereo VCA compressor sporting THAT 2181 VCAs and precision-stepped controls. With the Variable VCA Drive, you can shift through decades of SSL dynamics, from SuperAnalogue transparent to the aggressive grit of the 4K consoles.

The Variable VCA Drive can allow access to up to 10% THD VCA drive. Side-chain functions include an adjustable side-chain high-pass filter (30 to 185 Hz) and a selectable external stereo side-chain input. The Bus Comp Classic features expanded ratio options, with selectable ratios ranging from 1.5:1 to 10:1. Ratio, Attack, Release, and S/C HPF are all stepped for easy recall. Further controls include Make-Up Gain (up to 20 dB), Threshold (-20 to +20 dB), and VCA Drive. The unit sports an optional SSL Auto Release mode for program-dependent compression that responds dynamically to changing audio material. The Bus Comp Classic features an analog VU meter and stereo XLR connections for input, output, and external side-chain.

High-Performance THAT 2181 VCAs

At the heart of Bus Comp Classic are high-performance THAT 2181 VCAs in the audio path, paired with the unique SSL side-chain architecture that incorporates a VCA in its feedback loop. Together, they create the distinctive response that has made the SSL Bus Compressor a studio staple, combining punch, movement, and cohesion with exceptional musicality. From subtle gain reduction to assertive bus processing, transients remain defined yet controlled, while multiple elements begin to move and breathe together.

Variable VCA Drive

• New Variable VCA Drive extends Bus Comp Classic far beyond a single sonic signature, placing decades of SSL console character under one continuously variable control.
• With VCA Drive at its cleanest setting, the VCAs operate in a balanced configuration, for the low-distortion clarity and powerful transient response associated with SSL’s SuperAnalogue generation 9000 Series and today’s Oracle and Odyssey consoles.
• As soon as the control is activated, the VCAs operate in an unbalanced configuration, recreating the harmonic behavior and character of classic SSL designs such as the FX384 and 4000 Series consoles.
• Increasing the control further progressively introduces additional color and saturation, moving from subtle console-style richness through to the denser, more aggressive character associated with early 4K designs.
• From polished mix finishing to heavily driven drums, to parallel compression approaching 10% THD, Variable VCA Drive lets you decide how clean, colored, or confrontational the compressor becomes.

Classic Control with More Musicality

Bus Comp Classic retains the SSL Attack, Release, and Ratio settings that have become central to professional bus compression; here they are presented as precision six-position stepped controls for fast operation, accurate recall, and repeatable results. Additional Ratio and Release settings extend the compressor's creative range, offering greater control and flexibility while preserving the speed and immediacy of the classic SSL workflow.

Each compression ratio has its own carefully defined behavior. The renowned 2:1 mode features an exceptionally gentle soft-knee response, allowing gain reduction to develop progressively for transparent mix bus processing. Higher ratios deliver increasingly assertive control and greater density, making them equally effective on stems, drum buses, and parallel chains.

SSL Auto Release

More than simply another release setting, SSL Auto Release has a character of its own. Its program-dependent, two-stage release circuitry responds dynamically to changing material, releasing louder elements of the program material more quickly, while allowing quieter material to recover more gradually. The result is a natural, musical release character that retains movement, detail, and control, making Auto particularly effective on complex program material.

Built for Record Making

From classic stereo mix and music bus compression to creative parallel processing chains, Bus Comp Classic adapts effortlessly to the way records are made.

Use it to bring lead and backing elements together into a cohesive arrangement, shape the movement of an instrument bus, add urgency to drums, or apply the final touch that makes a mix feel complete. Its focused workflow makes it an immediate creative tool for artists and producers, while providing the precision and repeatability engineers depend on for professional mixing.

Modern Side-Chain Control

A precision six-position side-chain high-pass filter gives you greater control over the compressor’s response to low-frequency material. By reducing the influence of bass-heavy elements on the detector circuit, kick drums and bass can retain their depth and impact without driving excessive gain reduction across the rest of the mix.

The genuine stereo external side-chain input supports both creative processing and advanced delivery workflows. When printing individual stems, the complete mix can feed the side-chain while each stem passes separately through the audio path. Every stem therefore receives the gain-reduction behavior it experienced within the full mix, helping preserve the balance and movement of the approved production across alternate versions and deliverables.

Specifications

• Type
  • Compressor
• Number of Channels
  • 2-Channel
• Circuitry
  • Solid-State
• Metering Type
  • VU Meter
• Compressor/Limiter Type
  • VCA
• Threshold
  • -20 to +20 dB
• Ratio
  • 1.5:1 to 10:1
• Attack Time
  • 0.1 ms to 30 ms
• Release Time
  • 0.1 sec to 1.6 sec 
• Make-Up Gain
  • Up to 20 dB
• Knee
  • Continuously Variable
• Sidechain Filter 
  • High-Pass: Off / 30 / 60 / 105 / 125 / 185 Hz
• Sidechain Insert
  • Yes
• Audio I/O
  • 4x XLR 3-Pin Balanced Input
  • 2x XLR 3-Pin Balanced Output
• Input Power
  • 100 to 240 VAC, 50 / 60 Hz
• Rackmount Size
  • 1 U
• Dimensions
  • 19 x 10.9 x 1.7" / 48.3 x 27.7 x 4.3 cm
• Weight
  • 7.67 lb / 3.48 kg

In The Box

• Solid State Logic Bus Comp Classic 2-Channel VCA Compressor
• Power Cord
• Limited 1-Year Manufacturer Warranty