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C4 Quad Compressor

C4 Front

C4 Rear

  • Independent Compressor / Dynamic EQ / Limiter per channel.
  • Relative-threshold Dynamic EQ remains calibrated for all levels.
  • Auto mode for fast setup of Attack and Release.
  • External side-chain with balanced / unbalanced 1/4" TRS input.
  • Side-chain has a parametric EQ with Compress, Dynamic EQ and Listen modes.
  • Adjustable soft or hard knee compression.
  • Independent metering: Side-chain level, Threshold indicator, Gain reduction and Limiter headroom.
  • Stereo Link between channels 1 and 2 or 3 and 4.
  • XLR and 1/4" TRS input / output connectors.
  • Universal internal switching power supply (100-240V).

This product has not been tested to the current CE requirements and is not available in markets requiring CE compliance.

C4 Quad Compressor

C4

The C4 Quad Compressor / Limiter / Dynamic Equalizer presents matchless feature, performance and ergonomic value. The C4 offers four feature-packed channels of compression and limiting in a 2U package. Internal and external side-chain options offer a fully adjustable parametric EQ for frequency-dependent compression or de-essing. The oversampled brick wall limiter determines the maximum output level and operates independent of the compressor. Adjacent channels link in a master/slave arrangement to ensure accurate tracking of stereo inputs. Intuitive meters show side-chain level relative to Threshold, gain reduction and complete dynamic range at a glance.

Analog controls (knobs, sliders) allow a performer or sound engineer to make precise adjustments in real time. Digital signal processing (DSP) provides a degree of accuracy, consistency and flexibility that simply cannot be matched with a traditional analog design.
The C4 combines the best of both worlds by using analog controls and high performance digital processing to achieve an unprecedented feature set. Benefits of this approach:

Allows the use of advanced compression and dynamic EQ techniques which are difficult or costly to implement in traditional analog designs.

  • Improved accuracy and repeatability.
  • Exceptional immunity to RF and electromagnetic interference.
  • Lower cost per channel.

C4 Applications

The C4 features auto balanced/unbalanced XLR and ¼" TRS input and output jacks, permitting connection to any mixing console. Side-chain inputs are also auto balanced/unbalanced, on ¼" TRS only. Dynamics processors typically connect using a mixing console’s insert points (send/return), although they can be used in-line, such as when compressing or limiting an overall mix, for example.

C4 Application

Suggested Settings

ATTACK

RELEASE

RATIO

KNEE

Vocals
Medium to Fast
Medium to Slow
2:1 to 4:1
Soft
Clicky Bass
Fast
Fast
4:1 or higher
Hard
Mushy Bass
Medium to Slow
Medium to Slow
4:1
Hard
Raging Electric Guitar
Fast
Slow
4:1 or higher
(more sustain)
Hard
Acoustic Guitar
Medium to Slow
Medium to Slow
4:1
Medium
Brassy Horns
Fast
Fast
5:1 or higher
Hard
Drums (kick, snare)
Fast
Fast
4:1
Hard
Drums (cymbals)
Fast
Slow
2:1 to 10:1
Hard

C4 Application

The adjustable KNEE setting provides full control over how the compressor transitions from unity gain to maximum compression. Softer knee settings are preferred when compressing vocals or an overall music mix, while harder knee settings work better for bass and drums, for instance.

C4 Knee

True De-essing with Dynamic EQ

C4 Dynamic EQ

The C4 uses a relative threshold approach to dynamic EQ to ensure precise, predictable performance. Unlike traditional de-essers, which simply use an EQ boost in the side-chain to increase the compressor’s sensitivity to high frequencies, the C4 actually determines the amount of sibilance present in the program material and compares it to the overall signal content. The benefit to this approach is that de-essing depends only on the relationship between sibilant sound and the broadband (full-range) sound, and is not affected by changes in absolute level. The result: sizzly sounds are successfully subdued during soft or strident sections. A de-essing ‘preset’ in each channel is found by aligning the controls to the triangle markers.

Other De-essers

A compressor with a simple side-chain EQ boost is not a true de-esser. Gain reduction is directly affected by varying input levels, not the actual ratio of broadband to sibilant material.

C4 Literature

Each unit is shipped with a booklet containing the Manual with Safety and Compliance information, the Data Sheet, the RaneNote "Sound System Interconnection," Declaration of Conformity, and Rane's 2+ Year Warranty information.

C4 Support

If the above options don't answer your question, or it's urgent...
Phone 425-355-6000, 8:30 AM to 5 PM PST, Monday through Friday.
If it's less urgent, you can email the factory.
For local service within the USA, find a service center.