Making Connections; Front Panel Controls; Side-Chain And Gain Reduction Meters - Rane C4 Operator's Manual

Quad compressor / limiter

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Operator's manual (12 pages)

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Making Connections

The C4 features auto balanced/unbalanced XLR and ¼"

TRS input and output jacks, permitting connection to virtually

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.

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Figure 6. Connection to a mixing console.

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Figure 7. Using an external equalizer in the side-chain.

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Front Panel Controls

Each channel of the C4 features the following meters and

controls:

Side-chain and Gain Reduction Meters

-12

-6

-3

-1

dBr

This triple-function meter displays the side-chain level,

threshold indication and amount of gain reduction being ap-

plied. It allows you to see at a glance exactly what the compressor

is doing at all times.

Side-chain Level Display

In Compressor mode, the ﬂoating meter displays the side-

chain level relative to the Threshold (dBr), making it easy to gauge

how close the signal is to the onset of compression. The dBr

indicators light from left to right as the signal approaches the

threshold. At threshold, the yellow TH indicator is lit. Above

threshold the TH indicator remains lit and gain reduction oc-

curs. Side-chain meter ballistics follow the rms detector time

constant of 30 ms.

In De-ess mode, the side-chain meter displays the relative

diﬀerence between the broadband program material and the

bandpass signal deﬁned by the PEQ, as compared to the set

Threshold.

Example: With THRESHOLD set to -15 dB, the TH indica-

tor lights when the sibilant portion of the program material is 15

dB below the broadband program material. If the sibilants are

18 dB below the broadband material, then the –3 dBr indicator

is lit.

Gain Reduction Display

The Gain Reduction meter displays the amount of gain cor-

rection presently applied to the signal, lighting from right to left

as the amount of gain reduction increases. In Compressor mode,

this meter display the amount of gain correction being applied

to the broadband program material. In De-ess mode. this meter

shows the amount of gain correction being applied to the dy-

namic EQ (DEQ) in the main signal chain. This meter does not

reﬂect any gain reduction occurring due to limiting.

Gain Reduction meter ballistics follow the actual gain cor-

rection value as determined by the THRESHOLD, RATIO,

ATTACK, RELEASE and KNEE controls. Gain reduction may

be indicated when the Threshold indicator is oﬀ, as attack and

decay rates may dictate continued gain reduction even when the

rms level is below threshold.

Reduction dB

Table of Contents

Making Connections; Front Panel Controls; Side-Chain And Gain Reduction Meters - Rane C4 Operator's Manual

Making Connections

Front Panel Controls

Side-chain and Gain Reduction Meters

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