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Manual-6

Making Connections

e 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/unbal-

anced, 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.

MIC INPUT

INSERT SEND

INSERT RETURN

INSERT SEND

INSERT RETURN

INSERT SEND

INSERT RETURN

INSERT SEND

INSERT RETURN

INSTRUMENT IN

SUB GROUP 1

SUB GROUP 2

CH 1 SIDE-CHAIN

CH 1 INPUT

CH 1 OUTPUT

CH 2 OUTPUT

CH 2 INPUT

CH 2 SIDE-CHAIN

CH 3 SIDE-CHAIN

CH 3 INPUT

CH 3 OUTPUT

MASTER

STEREO LINK

SLAVE

CH 4 SIDE-CHAIN

CH 4 INPUT

CH 4 OUTPUT

MIXER

BASS

MIC

Figure 11. Connection to a mixing console.

MIC INPUT

INSERT SEND

INSERT RETURN

CH 1 SIDE-CHAIN

GRAPHIC EQ

CH 1 INPUT

CH 1 OUTPUT

MIXER

–

±6

100

ME 30B

40031.525 40 6350 10080 160125250200315 12.5k1k630500800 1.6k1.25k 2k 3.15k2.5k 5k4k 8k6.3k 10k20k16k

MASTER CONTROL

POWEROL LEVELRANGEBYPASS

±12

–

MICROGRAPHIC

EQUALIZER

Figure 12. Using an external equalizer in the side-chain.

Front Panel Controls

Each channel of the C4 features the following meters and con-

trols:

Side-chain and Gain Reduction Meters

8-3 -1 12 42-6-12118

dBrReduction dB

is triple-function meter displays the side-chain level, threshold

indication and amount of gain reduction being applied. 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 oating meter displays the side-chain

level relative to the reshold (dBr), making it easy to gauge how

close the signal is to the onset of compression. e 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 occurs. Side-chain

meter ballistics follow the rms detector time constant of 30 ms.

In Dynamic EQ mode, the side-chain meter displays the

relative dierence between the broadband program material and

the bandpass signal dened by the PEQ, as compared to the set

reshold.

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

e Gain Reduction meter displays the amount of gain correc-

tion 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. is meter does not

reect 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 reshold indicator is o, as attack and

decay rates may dictate continued gain reduction even when the

rms level is below threshold.

1-CONDUCTOR SHIELDED CABLE

T = SEND

R = RETURN

S = SHIELD

SEND

RETURN

SHIELD SHIELD

SHIELD

Send/Return Cable Wiring (Insert Cable)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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