Shure SCM410 Operation & User’s Manual

• 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 The SCM410 is supplied with hardware for mounting one or two units to a 19-inch audio equipment rack. The hardware can also be used to rack mount other Shure products, including the SCM268, SCM262, DFR11EQ, and the DP11EQ. Single Mixer (Half Rack) Installation 1. Attach the short and long rackmount brackets to the SCM410/E with eight (8) of the supplied bracket screws. 2. Place the mixer in an equipment rack and secure it with the supplied rackmount screws and plastic washers. Dual Mixer (Full Rack) Installation 1. Place the two mixers side-by-side and connect them with two (2) straddle brackets. The brackets should straddle the recessed edges on the top and bottom of each mixer. 2. Fasten the straddle brackets using eight (8) bracket screws. 3. Attach the short rackmount brackets to the outsides of the com- bined mixers with eight (8) of the bracket screws. 4. Place the mixer in an equipment rack, using the supplied rack- mount screws and plastic washers. INSTALLING HALF-RACK MOUNTING BRACKETS RACK MOUNTING A SINGLE SCM410/E MIXER INSTALLING STRADDLE BRACKETS INSTALLING FULL-RACK MOUNTING BRACKETS RACK MOUNTING DUAL SCM410/E MIXERS

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. 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. LIMITER Output limiters prevent distortion during loud program peaks without affecting normal program levels. This keeps the devices connected to the SCM410 output from becoming overloaded. Increasing individual or Master controls on the SCM410 increases average output and, in turn, the amount of limiting. The limiter may be turned on via the rear panel DIP switch. The default limiter threshold is +16 dBu. As supplied, the limiter is defeated. NOTE: Limiter thresholds can be changed from their factory settings. Refer to the “Internal Modifications” Addendum. EQUALIZER FUNCTIONS Low Cut Filter (High-Pass) Low-cut filters are used to reduce unwanted low frequency sounds such as footsteps, motorized traffic, and to control proximity effect. The SCM410 has a one-pole, low-cut (high-pass) filter of 6 dB per octave. The low-cut filter allows all frequencies above its cutoff point to pass through unchanged. Frequencies below the cutoff are attenuated (see Figure 3). The cutoff point is defined as the frequency where the signal has dropped 3 dB relative to the flat, or bandpass, region. Below the cutoff point, the filter exhibits increasingly more attenuation as the fre- quency diminishes. LOW-CUT FILTER EFFECTS FIGURE 3 High-Frequency Shelving The fixed-frequency equalizer produces a 6 dB boost or cut at 5 kHz and above (see Figure 4). High-frequency shelving is extremely useful for boosting flat frequency response and tempering sibilant vocal mi- crophones or enhancing the sound of off-axis lavalier microphones. HIGH-FREQUENCY SHELVING EFFECTS FIGURE 4 -10 -8 -6 -4 -2 0 +2 20 100 1,000 5,000 FULL CW 50% ROTATION FULL CCW FREQUENCY AMPLITUDE 200 -10 -8 -6 -4 -2 0 +2 +4 +6 +8 +10 1,000 10,000 20,000 FULL CW 50% ROTATE FULL CCW FREQUENCY AMPLITUDE

kHz, one channel activated; source impedances: Mic 150 ; terminations: Line/Mic Aux 10 k Frequency Response (at 1 kHz, channel controls centered) 50 Hz to 20 kHz 2 dB; –3 dB corner at 25 Hz Voltage Gain (typical, controls full clockwise) Inputs Outputs Total Harmonic Distortion <0.1% at +4 dBu output level, 50 Hz to 20 kHz (through 22 Hz to 22 kHz filter; Input at 12 o' clock and Master at 12 o' clock, all other controls full counterclockwise) Equivalent Input Noise: (150  source; A-Weighted) –127 dBV max., –129 dBV typical Output Noise (channel controls full counterclockwise A-Weighted): Master full counterclockwise: –101 dBV Master full clockwise: –67 dBV Common Mode Rejection >70 dB at 1 kHz Polarity All inputs to all outputs are non-inverting Input Channel Activation Attack Time: 4 ms Hold Time: 0.4 s Decay Time: 0.5 s Off-Attenuation 13 dB Overload and Shorting Protection Shorting outputs, even for prolonged periods, causes no damage. Microphone inputs are not damaged by signals up to +10 dBV (3V) Equalization Low-frequency: 6 dB/octave cut, adjustable corner from 25 to 320 Hz High-frequency: shelving Filter, 6 dB at 5 kHz, rising to 8 dB at 10 kHz, Limiter Type: Peak Threshold: +16 dBu (at output) Attack Time: 2 ms Recovery Time: 300 ms Indicator: Lights red when limiting occurs Input LEDs Green on channel activation, red at 6 dB below clipping Phantom Power 12 Vdc open-circuit through 680  resistors Operating Voltage SCM410: 100-120 Vac rated nominal, 50/60 Hz, 100 mA (maximum) SCM410E; 220-240 Vac rated nominal, 50/60 Hz, 50 mA (maximum) Mains Inrush Current (230 Vac, SCM410E only) 0.7 A peak Temperature Range Operating: –7 to 49 C (20 to 120 F) Storage: –29 to 74 C (-20 to 165 F) Overall Dimensions 44 mm H x 219 mm W x 267 mm D (1-3/4 x 8-5/8 x 10-1/2 in.) Net Weight 1.75 kg (3.86 lbs) Certifications SCM410: UL LISTED to UL 60065 and cUL LISTED to CAN/CSA- C22.2 No. 60065-3 Canada. SCM410E: Conforms to applicable European Union Directives. Low Voltage Directive, 2006/95/EC: Certified to EN 60065. Eligible to bear CE marking. Conforms to European EMC Directive 2004/108/EC. Meets Harmonized Standards EN55103-1:1996 and EN55103-2:1996 for residential (E1) and light industrial (E2) environments. Conforms to the relevant requirements of Regulation (EC) No. 1275/2008, as amended. The CE Declaration of Conformity can be obtained from Shure Incorporated or any of its European representatives. For contact information please visit www.shure.com The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance Authorized European Representative: Shure Europe GmbH Headquarters Europe, Middle East & Africa Department: EMEA Approval Jakob-Dieffenbacher-Str. 12 75031 Eppingen, Germany Phone: +49-7262-92 49 0 Fax: +49-7262-92 49 11 4 Email: [email protected] Replacement Parts Knob, Master (white).........................................95A8238 Knob, Channel Gain (blue) ...............................95B8238 Line (Power) Cord (SCM410) ...........................95B8389 Line (Power) Cord (SCM410E).........................95B8778 Link Cable.........................................................95B8889 Fuse, SCM410 (5 x 20 mm, T 125mA L, 250V, time delay).......80AA730 Fuse, SCM410E (5 x 20 mm, T 50mA L, 250V, time lag) ...............80J380 Long Rack Mount Bracket.................................53A8484 Short Rack Mount Bracket................................53E8484 Straddle Bracket ...............................................53B8443 Bagged Hardware Kit.....................................90AW8100 Optional Accessories Line (Power) Cord, 230-240 Vac (UK) ..............95A8713 External 50 dB Line Pad .......................................A15LA Service Statement For additional service or parts information, please contact the Shure Service Department at 1-800-516-2525. Outside the United States, please contact your authorized Shure Service Center. Output Input Line Mic Aux Low-impedance mic (150 ) 80 dB 40 dB 68 dB Impedance Input Designed for use with Actual (typical) Input Clipping Level Mic 19-600  1.4 k –14 dBV Impedance Output Designed for use with Actual (typical) Output Clipping Level Line 5k  300  +22 dBV Mic 600  3  –20 dBV Aux 10k  1.5 k  +12 dBV

The SCM410 logic functions expand the range of installation and con- trol 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 publi- cation is available by contacting the Shure Applications Department.) The following logic functions are available for each channel: GATE OUT: Follows channel gating and goes to logic “low” (sinks cur- rent) when microphone is gated on. 500 mA of current sinking ability is provided (see Figure 5A). MUTE IN: Applying logic “low” (from GATE OUT or a switch closure to logic ground) gates channel off (see Figure 5B). Channel output drops to -. OVERRIDE IN: Applying logic “low” (from GATE OUT or a switch clo- sure to logic ground) forces channel on (see Figure 5B). When both Mute and Override are activated, Mute takes precedence (see Internal Modifi- cations Addendum for Override precedence). LOGIC GROUND: Logic ground is distinct from audio ground. Make all logic ground connections to this pin, including power supply ground of ex- ternal logic circuitry. To avoid switching clicks, do not connect logic ground to audio, chassis or rack grounds. Logic controls are accessed through the high density DB-15 multi-pin connector on the rear panel (Figure 6). Pin connections are shown in the following table. LOGIC CONNECTIONS CAUTION: Use of Advanced Functions is recommended only for qualified audio technicians. 55K 10K +5 V +5 V A B LOGIC EQUIVALENT CIRCUIT DIAGRAM FIGURE 5 FROM SCM410 CIRCUIT GATE OUT LOGIC GROUND MUTE IN OR OVER- RIDE IN TO SCM410 CIRCUIT LOGIC CONNECTOR FIGURE 6 Pin No. Logic Function Logic Function Pin No. 1 OVERRIDE IN 1 GATE OUT 1 6 2 OVERRIDE IN 2 GATE OUT 2 7 3 OVERRIDE IN 3 GATE OUT 3 8 4 GATE OUT 4 GATE OUT 4 4 5 LOGIC GROUND OVERRIDE IN 1 1 6 GATE OUT 1 OVERRIDE IN 2 2 7 GATE OUT 2 OVERRIDE IN 3 3 8 GATE OUT 3 OVERRIDE IN 4 14 9 NO CONNECTION MUTE IN 1 11 10 MUTE IN 4 MUTE IN 2 12 11 MUTE IN 1 MUTE IN 3 13 12 MUTE IN 2 MUTE IN 4 10 13 MUTE IN 3 LOGIC GROUND 5 14 OVERRIDE IN 4 NO CONNECTION 15 15 NO CONNECTION NO CONNECTION 9

tions Addendum. REMOTE VOLUME CONTROL The level of the Aux or Master output can be controlled from an exter- nal VCA (Voltage Controlled Amplifier) such as the RU-VCA1 from Radio Design Labs (Tel. 1-800-281-2683, or www.rdlnet.com). To connect a VCA to the SCM410, proceed as follows: 1. Connect the SCM410 Line output to the VCA line input. 2. Connect the VCA line output to the external device. 3. For remote Master level control, set the SCM410 Master control to 5. DIODE ISOLATION OF LOGIC CONTROLS Two or more control functions that use the same logic pins can be iso- lated with diodes, as shown in Figure 14. With this modification, a chan- nel can be muted by an overall group mute switch, or by its own cough button. EXTERNAL LOGIC DEVICES 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. NOTE: For information on logic gate use, refer to the TTL Cookbook and CMOS Cookbook, both by D. Lancaster, Howard Sams Publishing Co. DIGITAL CONTROLS OR MICROCOMPUTERS The SCM410 logic pins can interface with custom-designed digital control circuitry or microcomputers for unlimited possibili- ties of system control functions. M1 M3 D D DIODE ISOLATION OF LOGIC TERMINALS FIGURE 14 LOGIC GROUND GROUP MUTE COUGH BUTTONS D = 1N4148 OR EQUIVALENT + – 5.1 K G1 M1 O1 15V CMOS FIGURE 15 LOGIC GROUND CMOS GATES 15 V POWER

Asia, Pacific: Shure Asia Limited 22/F, 625 King’s Road North Point, Island East Hong Kong Phone: 852-2893-4290 Fax: 852-2893-4055 Email: [email protected] United States, Canada, Latin America, Caribbean: Shure Incorporated 5800 West Touhy Avenue Niles, IL 60714-4608 USA Phone: 847-600-2000 Fax: 847-600-1212 (USA) Fax: 847-600-6446 Email: [email protected] Europe, Middle East, Africa: Shure Europe GmbH Jakob-Dieffenbacher-Str. 12, 75031 Eppingen, Germany Phone: 49-7262-92490 Fax: 49-7262-9249114 Email: [email protected]