Model SCM410/SCM410E User Guide 4 2 4 6 8 2 4 6 8 2 8 INTELLIMIX 6 4 6 8 2 4 +6 +12 +18 -20 -10 0 LIM ITER SCM410/SCM410E FOUR CHANNEL AUTOMATIC MICROPHONE MIXER SCM410/SCM410E MÉLANGEUR AUTOMATIQUE À QUATRE CANAUX SCM410/SCM410E AUTOMATISCHER 4-KANAL-MIKROFON-MISCHER SCM410/SCM410E CONSOLA MEZCLADORA AUTOMATICA DE MICROFONOS DE CUATRO CANALES SCM410/SCM410E MIXER AUTOMATICO A QUATTRO CANALI PER MICROFONI ©2009 Shure Incorporated 27D8690 (Rev. 10) Printed in U.S.A.
TABLE OF CONTENTS DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 FEATURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 OPERATING PRINCIPLES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 FRONT PANEL - - - - - - - - - - - - - -
DESCRIPTION Each input channel has a two-band equalizer and three logic terminals. The equalizer reduces unwanted low-frequency audio pickup and makes different microphone types-lavaliers, boundary and handheldsound similar. The logic terminals can be used to control external devices. The SCM410 operates on 100-120 Vac power and the SCM410E operates on 220-240 Vac power. Each mixer is supplied with a power cord, rack-mounting hardware, and a link cable.
REAR PANEL 1 2 3 4 5 6 7 Power Connector: Unit is energized when the power cord is plugged into a 100-120 Vac (SCM410) or 220-240 Vac (SCM410E) power source. NOTE: There is no power On/Off switch on this mixer. AUX OUT Phono Connector: Feeds consumer-level audio equipment, such as a tape recorder, VCR, or video camera. Not affected by MIC/LINE switch. MIC/LINE XLR OUTPUT Connector: Can be set for microphone or line-level output via a DIP switch.
INSTALLATION SUPPLIED HARDWARE • • • • 4 rubber feet 1 rackmount bracket, long 1 rackmount bracket, short 2 straddle brackets • • • • 10 bracket screws, 6 mm (1/4 in.) 4 rackmount screws, 2.54 cm (1 in.) 4 plastic washers 4 wood screws, 1.25 cm (1/2 in.) RACK MOUNTING Dual Mixer (Full Rack) Installation The SCM410 is supplied with hardware for mounting one or two units to a 19-inch audio equipment rack.
TABLE-TOP MOUNTING Adhere the four (4) supplied rubber feet to the bottom of the mixer at each corner. This will keep it from sliding and protect the table surface. ATTACHING RUBBER FEET FOR TABLE-TOP MOUNTING FIXED MOUNTING TOP MOUNT 1. HANGING MOUNT Fasten the straddle brackets to the recessed edges of the chassis, using four (4) bracket screws. 1. Fasten the straddle brackets to the top of the mixer. INSTALLING STRADDLE BRACKETS FOR TOP MOUNTING 2.
SCM410 CONNECTIONS 1. 2. Connect microphone signal sources to the Channel Input connectors. Use conventional 2-conductor shielded audio cables. If any condenser microphones are connected, set the +12V phantom power DIP switch to ON. 3. 4. Connect the SCM410 Mic/Line Level Output to the input of mixers, EQs, amplifiers or recorders.
BASIC MIXER OPERATION 3. Adjust the Master level control for the required output level, as indicated by the output peak meter. The SCM410 is now ready for use. 1. Adjust each channel level so that its Overload LED flickers only during very loud speech or noise. 2. Adjust the Low-Cut and High-Frequency controls adjacent to each Input Gain control so that the microphones sound similar. LIMITER The limiter may be turned on via the rear panel DIP switch. The default limiter threshold is +16 dBu.
SPECIFICATIONS Measurement Conditions (unless otherwise specified): Line voltage 120 Vac, 60 Hz (SCM410) or 230 Vac, 50 Hz (SCM410E); full gain; 1 kHz, one channel activated; source impedances: Mic 150 Ω; terminations: Line/Mic Aux 10 kΩ Frequency Response (at 1 kHz, channel controls centered) 50 Hz to 20 kHz ±2 dB; –3 dB corner at 25 Hz Input LEDs Green on channel activation, red at 6 dB below clipping Voltage Gain (typical, controls full clockwise) Output Phantom Power 12 Vdc open-circuit through 680 Ω
ADVANCED FUNCTIONS CAUTION: Use of Advanced Functions is recommended only for qualified audio technicians. LOGIC CONNECTION SPECIFICATIONS LOGIC CONNECTIONS The SCM410 logic functions expand the range of installation and control options. Logic can be used for everything from simple cough switches to elaborate computer-controlled room systems. (Shure's AMS Update publication contains additional applications of advanced logic. This publication is available by contacting the Shure Applications Department.
SUGGESTED LOGIC APPLICATIONS REMOTE CHANNEL-ON INDICATORS This section contains suggestions on the uses of the SCM410's logic capabilities. Note that uses of these functions are not limited to the listed applications. The user is limited only by imagination and creativity. For additional suggestions and solutions to installation problems, contact the Shure Applications Department. Remote indicators can be used to indicate when a talker's microphone is on.
INHIBITING GATING FOR UNWANTED SOUNDS An existing sound system using 24-volt relays can be used with the SCM410 without modification if the relay coil current draw is under 500 mA. MaxBus attempts to activate only one microphone per sound source. Muting a microphone channel prevents its audio from appearing at the mixer's output. However, the muted microphone still communicates with other mic channels via MaxBus. A sound source picked up by a muted microphone will not activate other microphones.
INHIBIT FUNCTION EXTERNAL LOGIC DEVICES For information on the inhibit function, refer to the Internal Modifications section. SCM410 logic levels are directly compatible with TTL and 5V CMOS logic families. Mixer logic may be used with 15V CMOS logic if a pull-up resistor is used with each GATE output. See Figure 15. REMOTE VOLUME CONTROL NOTE: For information on logic gate use, refer to the TTL Cookbook and CMOS Cookbook, both by D. Lancaster, Howard Sams Publishing Co.
INTERNAL MODIFICATIONS • All Channel modifications in this section use Channel 1 as an example. • Only make changes to jumpers (X) and resistors (R). The circuit board contains holes where resistors are to be added. • For Channel modifications, the first character of the reference designator indicates the channel number,(i.e., R1027 refers to a Channel 1 resistor, X2001 refers to a Channel 2 jumper, etc.). Modifications affecting the Master section are preceded by a “9" (i.e., X9001).
CHANGING THE LIMITER THRESHOLD To change the limiter threshold from the preset value of +16 dBu, modify the circuitry according to the following table. CHANGE LIMITER THRESHOLD Limiter Threshold (dBu) Limiter DIP switch X9003 R9149 R9142 0 On -- Remove 20k +4 On Short -- -- +8 Off Short -- -- +12 On -- Remove 110k +16 (default) Οn -- -- -- +20 On -- Remove 300k +24 On -- Remove 400k CHANGING HOLD TIME To change the hold time from the preset value of 0.
CHANGING OVERRIDE IN TO MUTE IN (FILIBUSTER MODE) This modification should only be performed with the Change MUTE IN to Inhibit modification described above. This is only necessary if the Mute function is desired along with Filibuster Mode. 1. 2. Procedure: Short jumper X1006. Remove resistors R1087 and R1082. 1. Procedure: Remove resistor R9178. 2. Install new resistor at jumper points R9177.
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