Rane DC 22S User manual

DC22S
DYNAMICS CONTROLLER

ATTENTION: RISQUE DE CHOCS ELECTRIQUE - NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
To reduce the risk of electrical shock, do not open the unit. No user
serviceable parts inside. Refer servicing to qualied service personnel.
e symbols shown below are internationally accepted symbols
that warn of potential hazards with electrical products.
is symbol indicates that a dangerous voltage
constituting a risk of electric shock is present
within this unit.
is symbol indicates that there are important
operating and maintenance instructions in the
literature accompanying this unit.
WARNING
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, registers, stoves, or other apparatus (including ampliers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. e wide blade or third prong is provided for your safety. If the provided plug
does not t into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord and plug from being walked on or pinched particularly at plugs, convenience receptacles, and the point where it exits from
the apparatus.
11. Only use attachments and accessories specied by Rane.
12. Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. e plug on the power cord is the AC mains disconnect device and must remain readily operable. To completely disconnect this apparatus from
the AC mains, disconnect the power supply cord plug from the AC receptacle.
16. is apparatus shall be connected to a mains socket outlet with a protective earthing connection.
17. When permanently connected, an all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the
electrical installation of the building.
18. If rackmounting, provide adequate ventilation. Equipment may be located above or below this apparatus, but some equipment (like large power
ampliers) may cause an unacceptable amount of hum or may generate too much heat and degrade the performance of this apparatus.
19. is apparatus may be installed in an industry standard equipment rack. Use screws through all mounting holes to provide the best support.
WARNING: To reduce the risk of re or electric shock, do not expose this apparatus to rain or moisture. Apparatus shall not be exposed to dripping
or splashing and no objects lled with liquids, such as vases, shall be placed on the apparatus.
NOTE: is equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
ese limits are designed to provide reasonable protection against harmful interference in a residential installation. is equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment o and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Changes or modications not expressly approved by Rane Corporation could void the user's authority to operate the equipment.
is Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
WARNING: is product may contain chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.

ATTENTION: RISQUE DE CHOCS ELECTRIQUE - NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
An d’éviter tout risque de choc électrique, ne pas ouvrir l’appareil.
Aucune pièce ne peut être changée par l’utilisateur. Contactez un
SAV qualié pour toute intervention.
Les symboles ci-dessous sont reconnus internationalement
comme prévenant tout risque électrique.
Ce symbole indique que cette unité utilise un
voltage élevé constituant un risque de choc
électrique.
Ce symbole indique la présence d’instructions
d’utilisation et de maintenance importantes dans le
document fourni.
ATTENTION
INSTRUCTIONS DE SÉCURITÉ
1. Lisez ces instructions.
2. Gardez précieusement ces instructions.
3. Respectez les avertissements.
4. Suivez toutes les instructions.
5. Ne pas utiliser près d’une source d’eau.
6. Ne nettoyer qu’avec un chion doux.
7. N’obstruer aucune évacuation d’air. Eectuez l’installation en suivant les instructions du fabricant.
8. Ne pas disposer près d’une source de chaleur, c-à-d tout appareil produisant de la chaleur sans exception.
9. Ne pas modier le cordon d’alimentation. Un cordon polarisé possède 2 lames, l’une plus large que l’autre. Un cordon avec tresse de masse possède
2 lames plus une 3è pour la terre. La lame large ou la tresse de masse assurent votre sécurité. Si le cordon fourni ne correspond pas à votre prise,
contactez votre électricien.
10. Faites en sorte que le cordon ne soit pas piétiné, ni au niveau du l, ni au niveau de ses broches, ni au niveau des connecteurs de vos appareils.
11. N’utilisez que des accessoires recommandés par Rane.
12. N’utilisez que les éléments de transport, stands, pieds ou tables spéciés par le fabricant ou vendu avec l’appareil. Quand vous utlisez une valise de
transport, prenez soin de vous déplacer avec cet équipement avec prudence an d’éviter tout risque de blessure.
13. Débranchez cet appareil pendant un orage ou si vous ne l’utilisez pas pendant un certain temps.
14. Adressez-vous à du personnel qualié pour tout service après vente. Celui-ci est nécessaire dans n’importe quel cas où l’appareil est abimé : si le
cordon ou les ches sont endommagés, si du liquide a été renversé ou si des objets sont tombés sur l’appareil, si celui-ci a été exposé à la pluie ou
l’humidité, s’il ne fonctionne pas correctement ou est tombé.
15. La che du cordon d’alimentation sert à brancher le courant alternatif AC et doit absolument rester accessible. Pour déconnecter totalement
l’appareil du secteur, débranchez le câble d’alimentation de la prise secteur.
16. Cet appareil doit être branché à une prise terre avec protection.
17. Quand il est branché de manière permanente, un disjoncteur tripolaire normalisé doit être incorporé dans l’installation électrique de l’immeuble.
18. En cas de montage en rack, laissez un espace susant pour la ventilation. Vous pouvez disposer d’autres appareils au-dessus ou en-dessous de celui-
ci, mais certains (tels que de gros amplicateurs) peuvent provoquer un buzz ou générer trop de chaleur au risque d’endommager votre appareil et
dégrader ses performances.
19. Cet appareil peut-être installé dans une baie standard ou un chassis normalisé pour un montage en rack. Visser chaque trou de chaque oreille de
rack pour une meilleure xation et sécurité.
ATTENTION: an d’éviter tout risque de feu ou de choc électrique, gardez cet appareil éloigné de toute source d’humidité et d’éclaboussures quelles
qu’elles soient. L’appareil doit également être éloigné de tout objet possédant du liquide (boisson en bouteilles, vases,…).
REMARQUE: Cet équipement a été testé et approuvé conforme aux limites pour un appareil numérique de classe B, conformément au chapitre 15
des règles de la FCC. Ces limites sont établis pour fournir une protection raisonnable contre tout risque d’interférences et peuvent provoquer une
énergie de radiofréquence s'il n'est pas installé et utilisé conformément aux instructions, peut également provoquer des interférences aux niveaux
des équipements de communication. Cependant, il n'existe aucune garantie que de telles interférences ne se produiront pas dans une installation
particulière. Si cet équipement provoque des interférences en réception radio ou télévision, ceci peut être detecté en mettant l'équipement sous/hors
tension, l'utilisateur est encouragé à essayer de corriger cette interférence par une ou plusieurs des mesures suivantes:
• Réorienter ou déplacer l'antenne de réception.
• Augmenter la distance entre l'équipement et le récepteur.
• Connecter l'équipement à une sortie sur un circuit diérent de celui sur lequel le récepteur est branché.
• Consulter un revendeur ou un technicien radio / TV expérimenté.
ATTENTION: Les changements ou modications non expressément approuvés par Rane Corporation peuvent annuler l'autorité de l'utilisateur à
manipuler cet équipement et rendre ainsi nulles toutes les conditions de garantie.
Cet appareil numérique de classe B est conforme à la norme Canadienne ICES-003.
Cet appareil numérique de classe B est conforme à la norme Canadienne NMB-003.

Manual-1
OPERATORS MANUAL
QUICK START
Shredded, this document makes excellent packing material. In
its present form, it makes interesting and useful reading. If you
run out of patience quickly, at least read this part to make sure
you don’t exterminate everything within a two mile radius by
doing something wrong.
First, be sure the POWER switch is o. Attach one or two
channels of Inputs and Outputs to the respective connectors on
the rear. is device uses low impedance balanced line drivers. Do
not connect the XLR “+” or “–” output pins to ground, as this may
cause the power supply to shut down. For unbalanced use, leave the
unused output pin (“+” or “–”) unterminated. OK, now you can
power up your sound system, volumes down, amp turned on last.
With the GATE THRESHOLD turned all the way down to
-80 dBu, COMPRESSOR THRESHOLD turned all the way
up to 20 dBu, COMPRESSOR RATIO turned all the way
down to 1,and the OUTPUT LEVEL control in the center at 0
dB, you have an expensive patch cord.
While sending a signal to the DC22S, adjust the output
level of the previous device so the +4 dBu LED lights occasion-
ally, but the OL LED does not light. If you are driving the ¼"
WEAR PARTS: is product contains no wear parts.
DC22S
STEREO COMPRESSOR
INPUTS with a balanced signal (tip-ring-sleeve), set the Input
Gain switch to +4 dBu (in). When driving this input with an
unbalanced signal (tip-sleeve), set this switch to –10 dBv (out).
Regardless of the type of Input, you might need to set this switch
so the INPUT LEVEL LEDs light correctly.
Now increase the COMPRESSOR RATIO to something
useful, like 2:1 (with the control set at 2, the Ratio is 2:1; at 5, it
is 5:1.) Adjust the COMPRESSOR THRESHOLD to the point
you want the Compressor to kick in. e GAIN REDUCTION
meter reads the amount of signal compression.
If you want the quiet parts to be even quieter, increase the
GATE THRESHOLD so only higher levels make it through the
Gate.
Both Gates and Compressors will activate by the source
material applied to either channel if the LINK switch is on. is
is the preferred setting for stereo program material. e chan-
nel 1 controls set both channels to the same adjustments, as the
channel 2 controls go dormant and the LEDs extinguish. If
the LINK switch is o, then both channels are independently
controllable.
SLAVE 
THRESHOLD
OL
+4
MASTER
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
LEVEL
OL
+4
LEVEL
GATE
INPUT
COMPRESSOR
LINK
OUTPUT
LEVEL
6
24
12
3
THRESHOLD
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
GATE
COMPRESSOR
OUTPUT
LEVEL
6
24
12
3
1
INPUT
POWER
2
DC22S
DYNAMIC
CONTROLLER
dBu dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
dBu dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0

Manual-2
INPUT LEVEL indicators: With signal applied, the +4 dBu
LED may light occasionally. If the OL (overload) LED ashes,
turn the output level down on the previous device.
GATE THRESHOLD control sets the point at which the Input
signal level causes the Gate to become active.
_____________________________________________
COMPRESSOR THRESHOLD control sets the point at
which the Input signal level causes the Compressor to become
active. See Figure 1 on page Manual-4.
COMPRESSOR RATIO control: Once the reshold is
exceeded, the Ratio of input change to output change is deter-
mined by this control. e compressor has no eect when set
at 1:1. But at 10:1, it takes a 10 dB input signal increase above
the reshold to produce a 1 dB increase in Output Gain. See
Figure 2 on page Manual-4.
GAIN REDUCTION LEDs show the amount of average signal
reduction in dB. is aids in setting the THRESHOLD and
RATIO controls by showing how much compression is occur-
ing.
_____________________________________________
BYPASS switch compares the compressed and non-compressed
signal. ere is one for each channel. e INPUT LEVEL
indicators remain active regardless of switch position.
OUTPUT LEVEL control increases or decreases the output
gain of each Channel by 15 dB. In the center detent, gain will
be unity.
LINK switch activates both Compressors when either channel’s
signal exceeds the set reshold, preserving stereo imaging.
Switch this ON when using stereo material. e channel 1
controls become the Master when this switch is active, render-
ing the channel 2 controls and indicators dead.
_____________________________________________
Channel 2 controls duplicate the controls in channel 1. ese
are not active if the LINK switch is engaged.
Front Panel Description
SLAVE 
THRESHOLD
OL
+4
MASTER
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
LEVEL
OL
+4
LEVEL
GATE
INPUT
COMPRESSOR
LINK
OUTPUT
LEVEL
6
24
12
3
THRESHOLD
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
GATE
COMPRESSOR
OUTPUT
LEVEL
6
24
12
3
1
INPUT
POWER
2
DC22S
DYNAMIC
CONTROLLER
dBu dBu
:1
dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
dBu dBu
:1
dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
When the POWER LED is lit, the DC22S is connected to a
100-240 VAC source and ready to rock.
SLAVE 
THRESHOLD
OL
+4
MASTER
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
LEVEL
OL
+4
LEVEL
GATE
INPUT
COMPRESSOR
LINK
OUTPUT
LEVEL
6
24
12
3
THRESHOLD
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
GATE
COMPRESSOR
OUTPUT
LEVEL
6
24
12
3
1
INPUT
POWER
2
DC22S
DYNAMIC
CONTROLLER
dBu
dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
dBu dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
SLAVE 
THRESHOLD
OL
+4
MASTER
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
LEVEL
OL
+4
LEVEL
GATE
INPUT
COMPRESSOR
LINK
OUTPUT
LEVEL
6
24
12
3
THRESHOLD
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
GATE
COMPRESSOR
OUTPUT
LEVEL
6
24
12
3
1
INPUT
POWER
2
DC22S
DYNAMIC
CONTROLLER
dBu
dBu :1
dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
dBu dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
SLAVE 
THRESHOLD
OL
+4
MASTER
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
LEVEL
OL
+4
LEVEL
GATE
INPUT
COMPRESSOR
LINK
OUTPUT
LEVEL
6
24
12
3
THRESHOLD
REDUCTION
GAIN
THRESHOLD
RATIO
BYPASS
GATE
COMPRESSOR
OUTPUT
LEVEL
6
24
12
3
1
INPUT
POWER
2
DC22S
DYNAMIC
CONTROLLER
dBu dBu :1
dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0
dBu dBu :1 dB
-20
-60
-80
-70
-50
-40
-30
0
10
20-40
-30
-10
-20 31.7
1
1.2 10
2
6-6
12
15-15
-12
0

Manual-3
Rear Panel Description
INPUTS 1 and 2: Choose between the balanced XLR or the balanced/unbalanced ¼" TRS jacks, but only use one. Inserting a ¼"
TS jack will work—however—we recommend using balanced lines, especially when connecting any cable over 10 feet (3 meters)
in length. Consult the Sound System Interconnection RaneNote provided with this manual.
INPUTS 1 and 2 Gain Trim Switch: In its +4 dBu position, the Input gain of the respective channel is unity. In the -10 dBV posi-
tion, the input gain is increased by 12 dB (although mathematically suspicious, it really is 12 dB, not 14 dB) to compensate for
certain recording devices. is switch must be in the +4 dBu position for front panel calibration accuracy.
OUTPUTS 1 and 2 are delivered by the balanced XLR or the unbalanced ¼" TS jacks. Using both types of Outputs are permissible
to drive two devices, such as an amplier and a recorder. is device uses low impedance balanced line drivers. Do not connect the
XLR “+” or “–” output pins to ground, as this may cause the power supply to shut down. For unbalanced use, leave the unused output pin
(“+” or “–”) unterminated.
System wiring example for a DJ system
DC22S STEREO COMPRESSOR
TTM56S MIXER
AC22S STEREO 2-W
AY CROSSOVER
ME15S STEREO EQUALIZER
OUTPUTSINPUTS
RIGHTLEFT
OUTPUTS
LEFT
INPUTS
RIGHT
LEFTRIGHT RIGHTLEFT
LEVELLEVEL
010010
LEVELLEVEL
010010
STEREO AMP, HIGH
MONO OR BRIDGED AMP, MONO SUB
RIGHT SPEAKER
LEFT SPEAKER
MONO SUBWOOFER
WIRING
TIP / PIN 2 = POSITIVE
RING / PIN 3 = NEGATIVE
SLEEVE = SIGNAL GROUND
PIN 1 = CHASSIS GROUND
CHANNEL 1
OUTPUT INPUT
CHANNEL 2
OUTPUT INPUT
MADE IN U.S.A.
RANE CORP.
ME15S
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
100-240 V
50/60 Hz 7 WATTS
INPUT
1
OUTPUT
1
BAL/UNBALBALANCEDBALANCED BAL/UNBAL
+4 dBu
-10 dBV
MADE IN U.S.A.
RANE CORP.
DC22S
WIRING
3-PIN XLR:
• PIN 2 = (+), • PIN 3 = (–),
• PIN 1 = CHASSIS (SHIELD)
1/4" PHONE, BALANCED:
• TIP = (+), • RING = (–),
• SLEEVE = CHASSIS (SHIELD)
1/4" PHONE, UNBALANCED:
• SEE THE RANENOTE: SOUND
SYSTEM INTERCONNECTION
100-240 V
50/60 Hz 7 WATTS
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
INPUT
2
OUTPUT
2
BAL/UNBALBALANCEDBALANCED BAL/UNBAL
+4 dBu
-10 dBV
LOW OUTCH 1 IN
3-WAY IN
MONO SUB OUTMONO
LOW OUT
HIGH OUT STEREO 2-WAY
SUBWOOFER SWITCH MUST
BE SET TO 2-CHANNEL
FOR MONO 3-WAY
CH 2 INLOW OUT
2-CHANNEL
SUBWOOFER
MONO SUB
OMIT MONO
MONO 3-WAY
MODE
OMIT MONO
MONO SUB: OMIT
MID OUT
HIGH OUT
HIGH OUT
MADE IN U.S.A.
RANE CORP.
AC22S
PIN 2: POSITIVE
PIN 3: NEGATIVE
PIN 1: CHASSIS GND
100-240 V
50/60 Hz 7 WATTS
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
AUX
PHONO
GROUNDS
POWER
PGM 1PGM 2
4321
4
4
3
3
2
2
1
1
4321
100-240V
50/60 Hz
20 WATTS
MADE IN U.S.A.
RANE CORP.
U.S. PATENT 6,813,361
OUTIN
OUTIN
MIC
BALANCED
MASTER
OUTPUTS
R
L
R
L
R
L
R
L
R
L
R
L
LINE
PHONO
TTM 56S COMMERCIAL AUDIO
EQUIPMENT 24TJ
R
EFFECTS
SEND
UNBALANCED
FlexFX
RETURN
TIP = SEND
RING = RTN
BALANCED
INPUT
1
OUTPUT
1
BAL/UNBAL
BALANCED
BALANCED
BAL/UNBAL
+4 dBu
-10 dBV
CLASS 2 WIRING
3-PIN XLR:
• PIN 2 = (+), • PIN 3 = (–),
• PIN 1 = CHASSIS (SHIELD)
1/4" PHONE, BALANCED:
• TIP = (+), • RING = (–),
• SLEEVE = CHASSIS (SHIELD)
1/4" PHONE, UNBALANCED:
• SEE THE RANENOTE: SOUND
SYSTEM INTERCONNECTION
100-240 V
50/60 Hz 7 WATTS
INPUT
2
OUTPUT
2
BAL/UNBAL
BALANCED
BALANCED
BAL/UNBAL
+4 dBu
-10 dBV
DC22S
MADE IN U.S.A.
RANE CORPORATION
COMMERCIAL AUDIO
EQUIPMENT 24TJ
R

Manual-4
OPERATING INSTRUCTIONS
A PRIMER
Let’s start with what a compressor actually does. No matter how
you cut it, this is an automatic volume control. It is a hand on
a knob, turning the volume down and turning it up again. e
hand is really quick and really accurate, but it’s just turning a
volume control.
When the input signal reaches a level set by the COMPRES-
SOR THRESHOLD control, the compressor begins turning
down the signal by an amount determined by the RATIO con-
trol. e DC22S, like most compressors, operates by making the
loud signals quieter, but does not make the quiet parts louder.
However, by keeping the loud signals under control, the entire
system may be turned up when necessary to make the quiet parts
louder.
PRE-FLIGHT CHECKLIST
Before proceeding, it’s a good idea to turn the control knobs to
the following positions:
1. GATE THRESHOLD control .....fully counterclockwise
2. COMPRESSOR THRESHOLD ...fully clockwise
3. COMPRESSOR RATIO ..............fully counterclockwise
4. BYPASS switches.....................ACTIVE (out)
5. OUTPUT LEVEL........................0 dB
is renders the DC22S with no compression, allowing sig-
nal through at unity gain. No change occurs with the BYPASS
switch in or out.
INPUT LEVEL
Before making any reshold adjustments, set the ouput level of
the previous device so the +4 dBu LED lights occasionally, and
the OL LED does not light. Be aware that changes to the Input
Level will aect the resholds.
GATE THRESHOLD
e threshold is the point at which gain adjustment begins. When
the input signal is below the threshold, the DC22S attenuates
the signal at a 2:1 ratio, making the quiet parts twice as quiet.
When the signal is above the Gate reshold, the Gate is open,
like a straight wire.
COMPRESSOR THRESHOLD
e threshold is the point at which gain adjustment begins. When
the input signal is below the threshold, the Compressor section
acts like a straight wire. When the signal is loud enough to cross
the Compressor reshold, the compressor is active and turns
the volume down. Various reshold points are illustrated in
Figure 1. How much it gets turned down is determined by the
RATIO control ( Figure 1 shows a Ratio set at 2:1).
RATIO
Figure 1. With a xed Ratio set to 2:1, this graph shows gain reduction
below various Gate Thresholds at -20 dBu, -30 dBu, -40 dBu, etc.
FIgure 3. Threshold at -40 dBu. Ratios of 1:1, 1.2:1, 1.5:1, etc.
Vertical axis = output level, horizontal axis = input level.
AUDIO PRECISION amp 09 AUG 101 14:51:28
-80
-70
-60
-50
-40
-30
-20
-10
0
AMPL(dBr) vs AMPL(dBu)
-80 -70 -60 -50 -40 -30 -20 -10 0
INPUT (dBu)
O
U
T
P
U
T
d
B
u
Once the reshold is exceeded, the increase in output compared
to the input signal increase depends on the RATIO setting. An
ordinary preamp set for unity gain or a straight wire has a ratio
of 1:1, that is, the output level tracks the input level perfectly. A 2
dB change at the input produces a 2 dB change at the output.
For a 10:1 Ratio, a 10 dB blast at the input would rise only
1 dB at the output – heavy compression. Kinder, gentler ratios
are in the 2:1 to 3:1 range. Limiting, with no increase in signal
above the reshold, occurs at ∞:1. Figure 3 illustrates various
Ratios.
AUDIO PRECISION 09 AUG 101 14:34:57
-60
-50
-40
-30
-20
-10
0
10
20
-40
-30
-20
-10
0
10
AMPL(dBr) VS AMPL(dBu)
-60 -50 -40 -30 -20 -10 01020
INPUT (dBu)
O
U
T
P
U
T
d
B
u
Figure 2. With the Ratio set to ∞, the DC22S acts as a Limiter. This
graph shows Limiter gain reduction above various Compressor
Thresholds at 10 dBu, 0 dBu, -10 dBu, etc.
AUDIO PRECISION 09 AUG 101 14:45:47
-60
-50
-40
-30
-20
-10
0
10
20
AMPL(dBr) vs AMPL(dBu)
-60 -50 -40 -30 -20 -10 01020
1:1
1.2:1
1.5:1
2:1
3:1
6:1
∞:1
INPUT (dBu)
O
U
T
P
U
T
d
B
u

Manual-5
LIMITING
A limiter is a special form of compressor set up especially to
reduce peaks for overload protection. In other words, it’s a com-
pressor with a maximum ratio. A compressor is used to change
the dynamics for purposes of aesthetics, intelligibility, record-
ing or broadcast limitations. Once the threshold of a limiter is
reached, no more signal increase is allowed. e DC22S acts as a
limiter when set at a very high ratio of 10:1.
LINKING IN STEREO
When using the DC22S as a true stereo processor, with left
signal in Channel 1 and right signal in Channel 2, it is recom-
mended to turn the LINK switch on to prevent large balance
and image shifts. While LINKed, both Channels attenuate by
exactly the same amount when either Compressor works, main-
taining correct stereo imaging. Only Channel 1's controls are
active, Channel 2 becomes the slave.
RATIO relatively high, just enough to limit the peaks. Set the
GATE THRESHOLD very low, though you might want to raise
it just above the noise oor to get rid of tape hiss or processor
noise.
Of special interest are instruments which have large level
dierences in their tonal ranges. String pops on a bass are one
example, shrill peaks on a ute are yet another. e higher tones
require more breath and can seem much louder than lower
pitches. Another good application would be a drum mix or vocal
submix.
LONG DISTANCE LINE DRIVER
e DC22S is excellent as a line level amp for driving long lines
(from the mixer to the stage for instance). With the COM-
PRESSOR switch in the BYPASS position, the INPUT LEVEL
control and the output ampliers remain in the circuit. is
provides a very low distortion, low noise line driver. Balanced
XLR connections are recommended for the long run from the
DC22S's outputs (anything over 10 feet [3 meters]). A balanced
piece of equipment (equalizer or amplier) must be used at the
receiving end of this long line.
For unbalanced systems, use the ¼" inputs on the DC22S
and use the balanced XLR outputs to run the long distance. See
the RaneNote “Sound System Interconnection” included with
this manual for proper cable wiring.
SOUND SYSTEM WITH COMPRESSION
Let’s run a stereo system with compression. See the wiring dia-
gram on page Manual-3.
Patch the DC22S Compressor Inputs from the program
source or mixer outputs, and send the DC22S Outputs to the
system equalizer (if you have one), and then on to the crossover
inputs (if you have one). Set the equalizer and crossover Inputs to
unity gain. Set the LINK switch to ON, and adjust the CHAN-
NEL 1 COMPRESSOR THRESHOLD and RATIO controls
to keep the entire system dynamic range under control. Locating
the compressor before the equalizer results in correct spectral
balance during compression.
DRIVER PROTECTION
To individually limit Low and High drivers in a biamped system,
connect the Crossover Low Output into one DC22S Input, and
the High Output into the other DC22S Input. e DC22S
Outputs go right to the respective low and high frequency power
amplier inputs. For a stereo conguration use two DC22S
Stereo Compressors. Be sure the LINK switch is OFF. Set the
RATIO controls to 10:1.
Assuming your input signal has peaks in excess of -20 dBu,
you should be able to rotate the COMPRESSOR THRESH-
OLD controls and see some GAIN REDUCTION meter action.
You should begin to hear the dierence. Leave these controls at
whatever level is appropriate for your application. For the most
precise settings, see the section on the next page.
DC22S APPLICATIONS
TWO CHANNEL COMPRESSOR/LIMITER
In this case, the audio path on Channel 1 is completely sepa-
rate from Channel 2, allowing you to use it as a stereo unit or
for doing two completely dierent processes to two completely
dierent signals. For stereo use, the front panel LINK switch
allows you to link Channels. When either Channel’s reshold
is reached, both channels compress equally, preserving the stereo
image. Channel 1’s reshold and Ratio settings will aect both
Channels.
GUITAR & BASS
Where does the unit go in the signal chain? Well, that depends
on how you want it to function. If it’s a comp/limiter for the
input signal, it would go after the guitar (if the guitar has a
line-level output) and before the preamp. If it’s to function as a
limiter to protect the speakers in the rig, it would go after the
preamp and before the power amp. Another method is to insert
the unit in the eect loop of the preamp. is allows the bass
signal to be aected by the pre-amp rst, then the comp/limiter,
and then sent to the power amp. is can be desirable with tube
pre-amps.
RECORDING
Use it on bass guitar, piano, drums, or vocals—as an eect or to
tailor dynamic range for a particular recording medium. Patch
it between line-level devices or in your mixer inserts or “loops”.
e DC22S gives you more control and a less tortured sound,
and keeps instruments sounding “up-front.” In digital recording,
compress an extremely wide dynamic range into a signal that
won’t go into digital overload, i.e. severe clipping. is is really
valuable during a live digital recording when you just don’t know
how loud it may get, and digital distortion can ruin an otherwise
good take. Set both the COMPRESSOR THRESHOLD and

Manual-6
DRIVER PROTECTION FINE TUNING
1. Determine the driver’s maximum continuous average power rating in watts (W) (specied by the manufacturer).
2. Determine the driver impedance “z” in ohms (specied by the manufacturer).
3. Using the data in steps (1) and (2) above, calculate the maximum signal level in dBu that the driver can handle.
Max dBu = 20*log(√ (w*z)/.775).
4. Determine the gain of the amplier in dB (if the amplier has a level control , you may wish to measure the gain). If, i.e., you put
1V in, how many volts come out? en convert to dB (20 log gain).
5. Subtract the gain of the amplier in dB from the answer in step (3) to obtain the correct COMPRESSOR THRESHOLD.
6. Set the RATIO to 10:1.
NOTES
Any change in amplier sensitivity setting will eect the power limit to the driver.
If the DC22S is placed just before the amplier, no other system levels will eect the power limit setting.
EXAMPLE
1. Driver power rating: w = 100 watts.
2. Driver impedance: z = 4 ohms.
3. 20*log(√(w*z)/.775) = 28.2 dBu.
4. Amplier gain is 30 dB ( 1V in equals 31.6 V out).
5. Set the COMPRESSOR THRESHOLD control to 28.2 dBu-30 dB = -1.8 dBu.
6. Set the RATIO control to 10:1.
All features & specications subject to change without notice.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 TEL [phone] FAX [phone] WEBrane.com

· ·
(Signature)
January 15, 2009
(Date)
Mukilteo WA, USA
(Place)
Compliance Engineer
(Position)
Declaration of Conformity
Application of
Council Directive(s):
2001/95/EC
2002/96/EC
2004/108/EC
2006/95/EC
2011/65/EU
Manufacturer:
Rane Corporation
10802 47th Avenue West
Mukilteo WA 98275-5000 USA
is equipment has been tested and found to be in compliance with all applicable standards and regulations applying to the
EU’s Low Voltage (LV) directive 2006/95/EC, and Electromagnetic Compatibility (EMC) directive 2004/108/EC. In order
for the customer to maintain compliance with this regulation, high quality shielded cable must be used for interconnection
to other equipment. Modication of the equipment, other than that expressly outlined by the manufacturer, is not allowed
under this directive. e user of this equipment shall accept full responsibility for compliance with the LV directive and
EMC directive in the event that the equipment is modied without written consent of the manufacturer.is declaration
of conformity is issued under the sole responsibility of Rane Corporation.
Type of Equipment: Professional Audio Signal Processing
Brand: Rane
Model: DC22S
Immunity Results: THD+N: 4 dBu, 400 Hz, BW = 20 Hz - 20 kHz
Test Description Specication Conditions
RF Electromagnetic Fields Immunity
80 MHz -1000 MHz, 1 kHz AM, 80% depth, 3V/m < -80 dB 80 MHz - 120 MHz
<-76 dB 120 MHz - 155 MHz
<-70 dB 155 MHz - 421 MHz
<-52 dB 421 MHz - 487 MHz
<-64 dB 487 MHz - 736 MHz
<-54 dB 736 MHz - 854 MHz
<-75 dB 854 MHz - 1000 MHz
Conducted RF Disturbances Immunity
150 kHz - 80 MHz, 1 kHz AM, 80% depth, 3V RMS < -89 dB Power Lines
< -88 dB Signal Lines
Magnetic Fields Immunity
50 Hz - 10 kHz, 3.0 - 0.3 A/m < -81 dB
Common Mode Immunity: Bandpass re: 4 dBu, 1/3-octave
50 Hz - 10 kHz, -20 dBu < -78 dB
I, the undersigned, hereby declare that the equipment specied above conforms
to the Directive(s) and Standard(s) shown above.
Greg Frederick
(Full Name)
Standard(s) to which
conformity is declared:
EN60065: 2002/A1:2006/A11:2008/A2:2010/A12:2011
EN55103-1:2009
EN55103-2:2009
EN50581:2012
ENVIRONMENT E2
CE MARK FIRST AFFIXED IN 2009
SERIAL NUMBERS 850000 - 950000