Transcript
DATA SHEET
C4
QUAD COMPRESSOR / LIMITER / DYNAMIC EQ
-12 -6
-3
-1 TH 18 12
8
2
Reduction dB 0
4
2
1
1
LINK
MASTER -20
dBr
-10
0
-30
1.5
+10
-40
+20
1
dBu
COMP THRESHOLD 250
25
ms
-6
10
-12
RATIO
100 50
n:1
5
125
500
500
25
ms
Auto
RELEASE
-30 Hard
Soft
KNEE
1
640 5
125
12
dBu
+22
24 dB
+10
1
COMP THRESHOLD 250
25
ms
125
-6
10
-12
500
4
2
500
+6
oct
10
BANDWIDTH
20
ms
Auto
RELEASE
2
Hz
20k
1 -12
dB
GAIN
0.5
+12
SIDE-CHAIN
-3
-1 TH 18 12
8
2
Reduction dB 0
5
oct
10
125 20
-10
Hard
Soft
KNEE
dBu
20k
12 24 dB
250
25
LIMIT THRESHOLD
ms
dB
GAIN
125
4
2
Comp Listen Dynamic EQ
SIDE-CHAIN
10
-12
500
500
+6
3
1
LINK
25
ms
Auto
RELEASE
Soft
KNEE
640 5
oct
10
BANDWIDTH
125 20
-40
dBu
+22
12 24 dB
20k
250
25
ms
dB
GAIN
125
Headroom
Comp Listen Dynamic EQ
SIDE-CHAIN
4
2
n:1
10
-12
500
500
+6
1
25
ms
Auto
RELEASE
5
oct
10
125 20
LIMIT 3 -20
-10
-30 Hard
Soft
KNEE
640
BANDWIDTH
BYPASS
GAIN 1s
6
0
12
+10
-40
dBu
+22
24 dB
LIMIT THRESHOLD Headroom
Auto
0.5
ACTIVE
+12
dB
2s
2
+12
Reduction dB 0 -6
50
ATTACK
1 -12
8
5
RATIO
100 50
0
FREQUENCY PEQ
1
COMP THRESHOLD
LIMIT THRESHOLD
3.15k
Hz
+10 +20
6
+10
-1 TH 18 12
2 1.5
dBu
0
-3
dBr 0
-40 3
-10
-30 Hard
-12 -6 -10
-30
LIMIT
-20
Auto
0.5
BYPASS
GAIN 1s
4 SLAVE -20
ACTIVE
+12
dB
2s
2
+12
-6
50
ATTACK
Headroom
n:1
5
RATIO
100 50
1 -12
1
COMP THRESHOLD
6
3.15k
Hz
+10 +20
0
FREQUENCY PEQ
1.5
dBu
0
+22
0
-40
+10
-40
dBr
-10
-30
LIMIT
-30
640
BANDWIDTH
BYPASS
3
2s
25
-20 ACTIVE
-20
Auto
0
FREQUENCY PEQ
-12 -6
GAIN
Comp Listen
0.5
1
+12
dB
1s
50
ATTACK
Headroom
n:1
5
RATIO
100 50
LIMIT THRESHOLD
3.15k
8
Reduction dB 0
1.5
+20
6
+10
-40
0
dBu
0
-1 TH 18 12
2
MASTER
-40 3
-10
-3
dBr
-10
-30
LIMIT
-20
Auto 2
BYPASS
GAIN
2s
-12 -6
-20 ACTIVE
+12
dB
1s
50
ATTACK
+6
2 SLAVE
3.15k
Hz
C4
QUAD COMPRESSOR
0
20k
FREQUENCY PEQ
POWER -12
dB
GAIN
+12
Comp Listen Dynamic EQ
SIDE-CHAIN
General Description
Analog-Controlled Digital
The C4 Quad Compressor/Limiter presents matchless feature, performance and ergonomic value. Rounding out Rane’s popular series of analog-controlled digital products for live sound applications, 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. For details on what the C4 can do for your sound, see the RaneNote Dynamics Processors — Technology & Application Tips available at the Rane website.
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.
Features • • • • •
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 ¼" TRS input. Side-chain includes 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 ¼" TRS input/output connectors. • Universal internal switching power supply (100-240V).
Data Sheet-1
C4 QUAD COMPRESSOR / LIMITER / DYNAMIC EQ Parameter Inputs: Type ..........Maximum Input ..........Common Mode Rejection ..........Input Impedance ..........Main Input Connectors ..........Side-Chain In Connectors Digital Processing Converters: Sample Rate ..........Dynamic Range ..........Propagation Delay ..........Fixed-Point DSP Dynamics Processing Side-chain detect Dynamics Controls ..........Bypass ..........Threshold Range ..........Ratio ..........Gain ..........Attack ..........Release ..........Knee ..........Limit Threshold Side-Chain PEQ: Gain ..........Frequency ..........Bandwidth ..........Internal / External ..........Normal / Listen Link Channels Meter: Gain Reduction ..........Side-chain level ..........Headroom Outputs: ..........Connectors ..........Impedance ..........Maximum Output EMI Filters Frequency Response THD+Noise THD+Noise Crosstalk Power Supply Requirement Unit: Agency Listing Unit: Construction ..........Size ..........Weight .....Shipping: Size ..........Weight Note: 0 dBu=0.775 Vrms
Data Sheet-2
Specification Active Balanced +22 60 10k XLR, ¼" TRS ¼" TRS 48 106 1.2 48-bit double precision Compress/Dynamic EQ/Limit PEQ rms, Bandpass rms toggle switch +20 to -40 1:1 to 10:1 -12 to +12 25 to 500 0.025 to 2.0 0 to 10 +22 to -40 ±12 20 to 20k 0.5 to 10 Auto Cable Detect Toggle switch 1 & 2, 3 & 4 -12, -6, -3, -1, Threshold Relative to Threshold setting Relative to Limit setting Active Balanced XLR, ¼" TRS 100 +22 Yes 15 Hz to 20 kHz .02 .006 <-100
All Steel 3.5" H x 19" W x 5.25" D (2U) 7.3 lb 4.5" x 20.3" x 13.75" 12 lb
Limit
Units
1 typ. 1%
dBu dB Ω
Conditions/Comments Auto balanced/unbalanced 1 kHz 1 kHz Each leg to ground @ 1 kHz XLR pin 2 hot per AES standards Tip = hot, ring = negative
typ. typ.
kHz dB ms
24-bit A-weighted (input to output); unity Converter delay
1
dB
LED mode indicators True rms, 50 ms average RC All pots 8-bit resolution or 256 steps Active/Bypass LED indicators Before Limiter
1
dB ms Sec. dB Peak dBu dB Hz oct.
dB dBr Peak dBr
1% 1
Ω dBu
+0/-3 typ. typ. typ.
dB % % dB
0 dB gain detent Settle to 85% of final value For 10 dB step Span Oversampled brick wall
LED indicator (listen to side-chain) Switchable Each channel 4-segment, relative to Threshold 5-segment Auto balanced/unbalanced XLR pin 2 hot per AES standards Each leg to ground 600 Ω or greater Inputs and Outputs +4 dBu, 20-20 kHz, 20 kHz BW +4 dBu, 1 kHz, 20 kHz BW 2 kHz 100 to 240 VAC, 50/60 Hz, 20 W UL/cUL/CE (8.9 cm x 48.3 cm x 13.3 cm) (3.3 kg) (11.5 cm x 52 cm x 35 cm) (5.5 kg)
C4 QUAD COMPRESSOR / LIMITER / DYNAMIC EQ Block Diagram DSP BLOCK
MASTER CHANNEL ONLY CH2 or CH4 PK
+22
-40 LINK
dB
THRESHOLD
PEAK DETECTOR
LIMIT
LIMIT 3
HEADROOM
6 12
To Link Channel
-12
INPUT 2
DYNAMIC EQ
+ 3 -
ADC
1
24
+12
COMPRESSOR GAIN CONTROL
GAIN
OR
LIMITER GAIN CONTROL
ACTIVE
DAC
LISTEN
Dynamic EQ Gain reduction is NOT Linked in Dynamic EQ mode. Only the controls are Linked.
SLAVE CHANNEL ONLY COMPRESSOR ONLY LINK CH 2 or CH 4
+ 2
NORM
DYNAMIC EQ NORM
OUTPUT
BYPASS
LINK
MASTER CHANNEL ONLY
CH1 or CH3 LMT
CH1 or CH3 COMP TO CH 2 or CH 4
CH1 or CH3 COMP
Controls are linked in Comp and Dynamic EQ Modes
FREQ 20
BW
MASTER CHANNELS ONLY
GAIN
20k 0.5 10 -12
LINK
+12
CH2 or CH4 RMS
THRESHOLD -60
+20
KNEE
(20 dB) SOFT
(0 dB) HARD
ATTACK (ms) RELEASE (ms)
COMPRESSOR ONLY
FLAT
SIDE-CHAIN (KEY)
25
NORM
PEQ
RMS DETECTOR
DYNAMIC EQ
NORM
NORM
INT ADC
25
2 Sec
(dB GAIN) ATTACK / RELEASE
RATIO
DYNAMIC EQ
RMS DETECTOR
DYNAMIC EQ
BP
dB
500
(1:1)
EXT
THRESHOLD
(10:1) RATIO AUTO
SWITCHING JACK
-12
-6
-3
-1
TH
18
12
8
dBr
True De-essing with Dynamic EQ
4
2
1
REDUCTION dB
Adjustable Knee Compression
+5
+4
+3
F W F M E # V
+2
Threshold
*ODSFBTJOH-FWFM
%FFTTJOH
Soft
0
nee
-2
H
e ne
K ard
+1
L
L
L
L
K
-1
O u t p u t d B u
-3
L -4
'SFRVFODZ )[
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 triangles .
-5
-4
-3
-2
-1
0
Input dBu
+1
+2
+3
+4
+5
-5
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.
Data Sheet-3
C4 QUAD COMPRESSOR / LIMITER / DYNAMIC EQ
Rear Panel
Applications MIC INPUT
MIC
CH 1 SIDE-CHAIN
INSERT SEND
CH 1 INPUT
INSERT RETURN
INSTRUMENT IN
BASS
MIC INPUT INSERT SEND
CH 1 OUTPUT
INSERT RETURN
CH 2 SIDE-CHAIN
MIXER
GRAPHIC EQ MASTER CONTROL 4
6
0
10
2
OL
±12
8
LEVEL
±6 BYPASS
RANGE
+ 6 4 2 1 0 1 2 4 6 –
25
31.5
40
50
63
80
100
125
160
200
250
315
400
500
630
800
1k
1.25k
1.6k
2k
2.5k
3.15k
4k
5k
6.3k
8k
10k
12.5k
16k
20k
+ 12 8 5 2 0 2 5 8 12 –
ME 30B
MICROGRAPHIC EQUALIZER
POWER
CH 1 SIDE-CHAIN CH 1 INPUT CH 1 OUTPUT
C4
CH 2 INPUT
INSERT SEND
CH 2 OUTPUT
INSERT RETURN
SUB GROUP 1
CH 3 SIDE-CHAIN
INSERT SEND
CH 3 INPUT
Using an external equalizer in the side-chain.
CH 3 OUTPUT
INSERT RETURN
MASTER
STEREO LINK
SLAVE SUB GROUP 2
CH 4 SIDE-CHAIN
INSERT SEND
CH 4 INPUT CH 4 OUTPUT
INSERT RETURN
C4
MIXER Connection to a mixing console.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 USA TEL 425-355-6000 FAX 425-347-7757 WEB www.rane.com Data Sheet-4
All features & specifications subject to change without notice. DOC 107486
