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DESCRIPTION 1 The Shure Model SCM800 is a full-featured, eight-channel mi- switchable 48 V phantom power, and a / -inch send/receive 4 crophone mixer for sound reinforcement, general audio re- insert jack. cording, and audio-visual systems. Any low-impedance, bal- The SCM800 operates on 120 Vac power; the SCM800E oper- anced dynamic or condenser microphone, including a wire- ates 230 Vac power. Both models are supplied with rack- less microphone system, can be used with the SCM800 mixer. mounti
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SCM800 REAR PANEL
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SYSTEM SETUP RACK MOUNTING THE SCM800/E To mount an SCM800 or SCM800E in a standard 483 mm (19-inch) audio equipment rack so that the front panel faces out, as shown in Figure 4. Then secure secure the mixer to the rack with the four supplied Phillips head screws. RACK MOUNTING THE SCM800/E FIGURE 4 SCM800/E CONNECTIONS Refer to Figure 5 and proceed as follows: TO STEREO OR MONO HEADPHONES 1. Connect microphone- or line-level signal sources to the FROM AUX– OR LINE–LEVEL SOURCE Channel Inpu
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LINKING MULTIPLE SCM800 MIXERS Up to four SCM800 mixers can be “linked” using the supplied link cables If additional inputs are needed. Such a configura- tion can provide 32 mic inputs. Refer to Figure 6. When multiple SCM800 mixers are linked, all input signals ap- pear at all linked mixer outputs––there is no master-slave rela- tionship. The output controls and functions of each linked mix- er are post-link and do not affect the signals appearing at other linked mixer outputs. Each mixer’s Ma
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BASIC MIXER OPERATION 1. Turn on the Power switch. 5. Adjust the SCM800 Master level control for the desired output level, as indicated by the output peak meter. 2. Adjust each channel level so that its Overload LED flick- ers only during very loud speech or noise. 6. Adjust the headphones volume level with the PHONES control knob. 3. Turn unused channel controls full counterclockwise. 4. Adjust the Low-Cut and High-Frequency controls adja- cent to each Input Gain control until all microphon
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SPECIFICATIONS Measurement Conditions (unless otherwise specified): Common Mode Rejection >70 dB at 1 kHz Line voltage 120 Vac, 60 Hz (SCM800) or 230 Vac, 50 Hz (SCM800E); full gain; 1 kHz. Polarity Mic/Line, Send inputs to all outputs are non-inverting; Aux Source impedances: Mic 150 , Line 150 input to all outputs is inverting Terminations: Line 10 k , Phones 300 tip-sleeve and ring- sleeve), Direct Out 10 k Overload and Shorting Protection Shorting outputs, even for prolonged periods, c
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INTERNAL MODIFICATIONS WARNING: All modifications must be performed by quali- ABOUT PRINTED CIRCUIT BOARD MODIFICATIONS fied service technicians. Voltages in this equipment are haz- A jumper is represented by “X” on the printed circuit ardous to life. No user-serviceable parts inside. Refer all board legend, a resistor is represented by an “R.” servicing to qualified service personnel. The safety certifica- The first number in the reference designator indicates tions of the SCM800 do not app
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INSERTING A 15 dB MICROPHONE PREAMPLIFIER PAD Each channel’s microphone preamplifier gain can be reduced Procedure: by 15 dB. This may be desirable with extremely high-output mi- To pad the gain of the MIC position crophones. 1. Remove surface mount resistor R1023. 2. Solder a 680 resistor at jumper X112. For a greater gain reduction, use a resistor with a value greater than 680 . Use a lesser value resistor for less reduction. To pad the gain of the PHM (phantom) position: 1. Remove surfac
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REMOTE VOLUME CONTROL OF CHANNELS The channel, aux, or master levels can be controlled remotely Procedure: by a dc voltage via an external VCA (Voltage Controlled Ampli- For channel control: fier). An example of an external VCA is the ST-VCA1 from Ra- 1. Connect the tip of a 1/4-in. connector to the line input of dio Design Labs (1–800–281–2683 or www.rdlnet.com). the VCA, and the sleeve to the ground of the VCA. 2. Connect the ring to the line output of the VCA. 3. Plug the 1/4-in. connect
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SHURE Incorporated http://www.shure.com United States, Canada, Latin America, Caribbean: 5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A. Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446 Europe, Middle East, Africa: Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414 Asia, Pacific: Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055
