DC 24 Manual
Contents
1. COMBINE mode w RESOURCES For additional explanations tips and assistance see The DC 24 Users Guide and Good Dynamics Processing Both of these RaneNotes are available on the Rane website 10802 47th Ave W Mukilteo WA 98275 5098 TEL 425 355 6000 FAX 425 347 7757 WEB www rane com 1031662. N 2 J reel b oa OS e CHANNEL 1 INPUT connectors deliver signal to both channel 1 of the processor and to the crossover circuit Choose either the XLR or the 4 TRS jack do not use both they do not sum CHANNEL 1 LOW OUTPUT connectors deliver signal from channel 1 s processing circuitry and represents the low pass portion of the signal when the CROSSOVER ENGAGE switch is in the iz position Both the XLR and the 14 TRS jack may be used at the same time if desired CHANNEL 2 INPUT connectors only deliver signal to channel 2 s processor It is disconnected when the CROSSOVER EN GAGE switch is in its i position Choose either the XLR or the 14 TRS jack do not use both they do not sum CHANNEL 2 HIGH COMBINE OUTPUT connectors make the signal from channel 2 available to the outside world and is the high pass portion of the audio when the CROSSOVER ENGAGE switch is in its iz position If the OUTPUTS switch is in the COMBINE position this output produces the sum of channels 1 amp 2 and its overall level is controlled by CH 2 OUTPUT LEVEL Both the XLR and the 4 TRS jack may be used at the same time if desired SIDE CHAIN Inserting a 14 TRS plug into this jack breaks the input signal path to both the Compressor and Gate control circuit Inserting an equalizer in this loop enables greater compression of boosted equalizer frequencies The standard convention is used of Tip Send amp Rin
3. RANE OPERATORS MANUAL DC 24 DYNAMIC CONTROLLER GATE EXPANDER COMPRESSOR LIMITER Oo CH 1 OUTPUE POWER Z 5 s a 10 9 as 2 O83 iia Oes 6 6 Rae 4d ail Oz BYPASS Oh 50 10 7 mH 4820 O 110 2020 on O 12 mResHoo Ratio muresh Ratio Ranae REDUCTION cl Lo SIG LEVEL OL SLAVE FREQUENCY ROSSOVER GATE EXPANDER COMPRESSOR LIMITER 2 o CH2 ourrur Goie ee 10 tS suse awe 5010 O De 48 20 o rm twneswow 7 namo muresh Ra 20 420 O20 SIG LEVEL OL Q THRESHOLD REDUCTION 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 in a two mile radius by doing some thing wrong In a nutshell to use the DC 24 as a conventional dual channel compressor limiter ensure that the CROSSOVER ENGAGE switch on the rear is in its out position Attach one or two channels of inputs and outputs to the respective connectors on the rear With all RATIOS down LIMITER THRESHOLD all the way up and the LEVEL controls in center detent you have an expensive patch cord Make sure the BYPASS switches are out and set the GATE and COMPRESSOR for the desired ratios and thresholds Turning the LIMITER THRESHOLD down decreases the level at which limiting occurs The GATES and COMPRESSORS may both be ac
4. ck wards and check your wiring PRE FLIGHT CHECKLIST Before proceeding it s a good idea to turn the control knobs to the following positions 1 POWER off 2 GATE EXPANDER THRESHOLD full CCW 3 GATE EXPANDER RATIO full CCW 4 COMPRESSION THRESHOLD full CCW 5 COMPRESSION RATIO full CCW 6 LIMIT THRESHOLD full CW 7 OUTPUT LEVEL centered in its detent 8 Set all pushbuttons on the front and rear to their out positions 9 Set the OUTPUTS slide switch to SEPARATE 10 Set the gain TRIM switches to 4 dBu LIMITING With all of the preceding accomplished turn the POWER switch on be sure your amp is turned down The DC 24 is now nothing but a unity gain amplifier Cycling the BYPASS switches with audio passing through the unit should yield no difference in level or sound dynamics The GAIN REDUCTION meters should indicate 0 and nothing else Assuming your input signal has peaks in excess of 20 dBu you should be able to rotate the LIMITER THRESHOLD controls CCW and see some gain reduction occur on the meter simultaneously with a randomly illuminating THRESHOLD LED You should begin to hear the difference Leave these controls at whatever Limit level is appro priate for your application COMPRESSION To use the Compressor set the COMPRESSOR THRESH OLD for an appropriate level you should see the associated LED illuminate as signal goes above and below this level The COM PRESSOR RATIO control adjusts the gain redu
5. ction slope above the level you have set GATE EXPANDER The Gate Expander function works similarly If the GATE EXPANDER THRESHOLD is still fully CCW rotate the GATE EXPANDER RATIO to its full CW position Stop your audio source and you will see the GAIN REDUCTION LEDs drop to the 24 dB position This indicates that the Chan nel is in the fully gated mode If you wish to have gating occur at a higher level rotate the GATE EXPANDER THRESHOLD control CW to a higher level If you wish to create special effects with this gate you may elect to use a lower GATE EXPAND ER RATIO setting This inhibits full gating by the amount indicated around the control Experiment with all the controls to obtain the required results Rane Corporation Manual 4 STERNO When using the DC 24 as a true stereo a k a sterno hey lighten up it s a joke processor left channel in Channel 1 and right channel through Channel 2 it is a good idea to operate the unit in the SLAVE mode to prevent large balance and image shifts While in the SLAVE mode both channels attenuate by exactly the same amount when the Gate and Compressor work maintaining the stereo image ATTENTION SHOPPERS This seems like a good place to throw in a few words of cau tion The DC 24 allows a great deal of flexibility As such it also allows one to come dangerously close to completely destroying an otherwise respectable audio signal if some thought and care is not
6. g Return INPUT GAIN TRIM switches In its 4 dBu position the input gain of the respective channel is unity In the 10 dBV position 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 This switch must be in the 4 dBu position for front panel calibration accuracy CROSSOVER ENGAGE switch In its iz position this switch places the low pass portion of the audio signal on CH 1 LOW OUT and the high pass portion on CH 2 HIGH COMBINE OUT SEPARATE COMBINE OUTPUT switch In the COMBINE mode the outputs of channel 1 and channel 2 are added together and delivered to the CH 2 HIGH COMBINE OUT connector This feature is supplied to allow an input to be split by the crossover high pass and low pass delivered to separate processor channels and recombined at the output of the unit The COMBINE mode has no effect on the output of channel 1 Remote POWER supply input The DC 24 is supplied from the factory with a Model RS 1 Remote Power Supply suitable for connection to this input jack The power requirements of the DC 24 call for an 18 24 volt AC center tapped transformer only This is not a telephone jack Never use a power supply with your DC 24 other than the one supplied or an exact replacement obtained from Rane Corporation Using any other type of supply may damage the unit and void the warranty Chassis ground point A 6 32 screw is used f
7. is connected to the inserts A most useful feature If the DC 24 is WEAR PARTS This product contains no wear parts used on mixdown it may be connected to the output of the mul tichannel recorder or again on inserts of the mixdown console Many recording situations require that the DC 24 be con nected to the patch bay in the system so it may be easily moved from one signal location to another This call should be made based upon the requirements of the application Wiring of this and all components should follow the Sound System Interconnection RaneNote included in this manual This note details standard wiring conventions which should be used to prevent noise and distortion Also see the Chassis ground point on page Manual 3 Manual 1 FRONT PANEL DESCRIPTION GATE EXPANDER COMPRESSOR LIMITER CH 1 OUTPUT CROSSOVER GATE EXPANDER COMPRESSOR LIMITER CH 2 OUTPUT Oo as o HIGH ae 200 400 ee 10 a 5 5 Py 10 0 Qs Mo 150 800 ee CS oe 5 5 E 10 0 Os 6 6 5 TE s DC 24 paa Or oS i z 5 100 2 lo oi s pi j CONTROLLER 50 10 1 i 48 20 o Ly 0 Ox O O 12 120 Re O 10 e wa 48 20 o EC 20 420 OxlO O2 7120 h mmes nino Tihem nano aas REDUCTION SIG LEVEL oL SIWES FREQUENCY THRESHOLD 7 RATIO THRESHOLD 7 RATIO na REDUCTION SIG LEVEL OL O ae OG 3 ATII BG POWER switch It has been a tradition at Rane Corporation to say something clever about the POWER switch on all its prod
8. low unity being applied to the audio signal by the VCA BYPASS switch When pressed in this channel in the DC 24 is is hard wire Bypassed Each channel may be individually By passed for comparison and alignment purposes See OPERATING INSTRUCTIONS on page Manual 4 OUTPUT LEVEL control increases or decreases the output gain of each channel by 12 dB In the center detent gain will be unity NOTE Channel 2 OUTPUT LEVEL controls overall output in COMBINE mode SIGnal present LED illuminates any time the input signal exceeds approximately 40 dBu The OverLoad LED illuminates any time the output exceeds a level equal to 4 dB below the clipping level DUAL SLAVE mode switch In the in SLAVE position this switch causes both channels Gate Compressor and Limiters to act together i e they are slaved All controls for both channels remain active so independent settings are still possible how ever whenever a signal in one channel exceeds its settings then both channels change by the same amount In the out DUAL position both channels operate independently CROSSOVER FREQUENCY control This rotary control selects the crossover frequency What did you think Manual 2 REAR PANEL DESCRIPTION pts ato GuTPUTS RINGI S NEGATIVE SLEEVE 1 SIGNAL GROUND a TP senD o cay ne coma ak agv Dau ae 10 dBV Bu OUTPUTS CH2 TRIM COMBINE C P swe CHAIN ENGAGE CH1 TRIM crossover a LOW AD sive CHAI
9. or chassis grounding purposes If after hooking up your system it exhibits exces sive hum or buzzing there is an incompatibility in the grounding configuration between units somewhere Your mission is to discover how your particular system wants to be grounded Here are some things to try 1 Try combinations of lifting grounds on units that are supplied with ground lift switches or links 2 If your equipment is in a rack verify that all chassis are tied to a good earth ground either through the line cord grounding pin or the rack screws to another grounded chassis Units with outboard power supplies such as the DC 24 do not ground the chassis through the line cord Make sure that these units are grounded either to another chassis which is earth grounded or directly to the grounding screw on an AC outlet cover by means of a wire connected to a screw on the chassis with a star washer to guarantee proper contact If you are connecting the DC 24 outputs directly to a power amplifier be sure to connect a ground wire to the amplifier chassis Refer to the Sound System Interconnection RaneNote supplied with this manual for further grounding information Qo Manual 3 OPERATING INSTRUCTIONS Once all of the inputs and outputs are properly connected in accordance with the preceding section normal operation of the DC 24 should be achievable If any of the following procedures do not appear to produce the required results take a step ba
10. put into the operation of the unit There are combinations of THRESHOLD and RATIO settings on the Gate Expander and Limiter which allow each to fight the others and in some cases completely cancel The same caution applies to any signal processor such as an equalizer or crossover however these are a bit more intuitive and less likely to be used in a destructive manner Just be gentle at first and you should not encounter too much difficulty If you become overwhelmed go back to the PRE FLIGHT CHECKLIST for initial control settings and start over BYPASS SWITCHES IN CROSSOVER amp COMBINE MODES Crossover Mode Do not use the BYPASS switches when in the CROSSOVER mode Use of BYPASS in the crossover mode is potentially destructive since these switches route full bandwidth audio to drivers designed only for a limited frequency range CH 2 BYPASS is automatically defeated but Ch 1 is still active do not engage the CH 1 BYPASS for any reason Combine Mode As more users particularly bass guitar players discover new applications for this mode they want to use BYPASS as an aid in optimizing settings Unfortunately the BYPASS switches do not operate in the COMBINE mode however a simple trick solves the problem Permanently engage the CH 1 BYPASS switch 2 Patch CHANNEL 1 OUTPUT to CHANNEL 2 INPUT using either the 14 TRS or the XLR jacks Be sure to use 2 conductor shielded cable The CH 2 BYPASS switch now operates in the
11. tivated by the source material applied to Channel 1 if the DUAL SLAVE switch is pressed in This is a normal condition for true stereo program material To use the DC 24 s crossover bandsplit mode be sure the rear panel CROSSOVER ENGAGE switch is iz Connect the input to CH 1 CROSSOVER IN With the rear panel OUTPUTS switch set to SEPARATE split outputs are available at the CH 1 LOW OUT and CH 2 HIGH COMBINE OUT jacks With the OUTPUTS switch at COMBINE use only the CH 2 HIGH COM BINE OUT jack for a mono sum of high and low channels NEVER CONNECT ANYTHING EXCEPT AN RS 1 OR OTHER APPROVED RANE AC POWER SUPPLY TO THE THING THAT LOOKS LIKE A TELEPHONE JACK ON THE REAR OF THE DC 24 This is an AC input and requires some special attention if you do not have an operational power supply EXACTLY like the one that was originally packed with your unit DC 24 CONNECTION Placing the DC 24 within the chain of events in your system varies slightly depending on application If you are assembling a sound reinforcement system the DC 24 would typically be placed between the equalizer you do use one don t you and the active crossover or the power amplifier if passive crossovers or the DC 24 crossover are used In recording applications the DC 24 may be used in con junction with insert loops on the mixing console or in series with the outputs en route to the recorder Most consoles allow headphone monitoring of the processed signal if the device
12. ucts Certain government restrictions now eliminate our option of continuing this tradition Pity POWER indicator LED This solid state yellow illumination device lights up to let the operator know Item 1 above is working and the thing is plugged in GATE EXPANDER THRESHOLD control allows the operator to set the input level below which the Gate Expander oper ates The LED illuminates yellow any time the input signal falls below the threshold level set by this control GATE EXPANDER RATIO control determines the Ratio to be applied to the Gate Expander function Increased clockwise rotation increases the circuit slope The full counter clockwise position disables the Gate Expander COMPRESSOR THRESHOLD control determines above what input level the Compressor functions Full clockwise rotation disables the Compressor entirely The LED illuminates yellow any time the input signal exceeds the threshold level set by this control COMPRESSIOR RATIO control determines the slope of the Compressor once it has exceeded the indicated threshold Full counter clockwise rotation of the RATIO control disables all Compressor activity LIMITER THRESHOLD control determines above what level the Servo Locked Limiter functions Full clockwise rotation of this knob disables all Limiter activity The LED illuminates red any time the input exceeds the LIMITER THRESHOLD set ting GAIN REDUCTION meter indicates the amount of reduction be
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