The C4 from Rane is a four channel compressor/limiter with internal and external side-chain options that 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.
The unit uses a relative threshold approach to de-essing to ensure precise, predictable performance. Unlike traditional de-essers, which simply use an EQ boost in the side-chain, 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 full-range sound and is not affected by changes in absolute level.
Adjacent channels can be linked in a master/slave arrangement to ensure accurate tracking of stereo inputs. Meters show side-chain level relative to threshold, gain reduction and complete dynamic range at a glance. Analog-controlled digital processing allows a performer or sound engineer to make precise adjustments, in real time using analog controls, while digital signal processing provides a degree of accuracy, consistency and flexibility that simply cannot be matched with a traditional analog design.
Four channel processor with independent compressor, de-esser and limiter per channel
Analog control of digital processing
Stereo Link between channels 1/2 and 3/4
Adjustable soft or hard knee compression
Auto mode for fast setup of attack and release setting
Internal side-chain includes a parametric EQ with compress, de-ess and
Relative-threshold de-essing remains calibrated for all levels
External side-chain access via balanced/unbalanced 1/4" TRS phone input
Independent metering of side-chain level, gain reduction, limiter headroom and threshold indicator
Exceptional immunity to RF and electromagnetic interference
Number of Channels
4 x XLR 4 x 1/4" TRS phone 4 x 1/4" TRS phone Insert
4 x XLR 4 x 1/4" TRS phone
Maximum Input Level
+20dB to -40dB (before limiter)
1:1 to 10:1
25 mSec to 500 mSec
0.025 Sec to 2 Sec
Maximum Output Level
-12dB to +12dB
15Hz to 20kHz, +0/-3dB
Not specified by manufacturer
19" x 5 1/4" x 3 1/2"
Adjacent channels link in a master/slave arrangement to ensure accurate tracking of stereo inputs