Model SCM268E User Guide MASTER 1 2 3 AUX IN 4 VE OUTPUT LE -20 icrop SCM268 m hone mixe -10 0 LMETER +6 +12 +18 POW ER r SCM268E Four-channel Microphone Mixer 四频道麦克风混音器 4 채널 마이크 믹서 ©2008 Shure Incorporated 27AS8880 (Rev. 2) Printed in U.S.A.
TABLE OF CONTENTS ENGLISH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 INTERNAL MODIFICATIONS . . . . .
ENGLISH ! IMPORTANT SAFETY INSTRUCTIONS ! 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. READ these instructions. KEEP these instructions. HEED all warnings. FOLLOW all instructions. DO NOT use this apparatus near water. CLEAN ONLY with dry cloth. DO NOT block any ventilation openings. Install in accordance with the manufacturer's instructions. DO NOT install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
SHURE SCM268 DESCRIPTION FEATURES • • • • Four transformer-balanced microphone inputs Transformer-balanced output-switchable mic/line level Five -10 dB line-level inputs Six-segment LED output level meter • • • Built-in 12-volt phantom power Internal power transformer Built-in low-cut filter on microphone inputs (below 80 Hz) FRONT PANEL 1 2 3 4 5 1 Gain Controls (1-4). Adjusts gain for microphone level inputs and auxiliary level inputs 1-4. 4 Master Gain Control (MASTER).
ENGLISH GAIN CONTROL INPUT GAIN OUTPUT GAIN The gain control knobs 1-4, located on the front panel, adjust the gain for both microphone and auxiliary-level inputs of channels 1-4 (see Figure 1). For example, the channel 1 gain control is used for both the channel 1 microphone input (MIC LEVEL INPUT 1) and the channel 1 auxiliary level input (AUX LEVEL INPUT 1). The auxiliary gain control knob (AUX IN) affects only the auxiliary input (AUX IN).
CONNECTIONS auxiliary level input (AUX LEVEL INPUT 4). Connecting both auxiliary level and microphone level inputs to a single channel is not recommended because the SCM268 would not be able to independently mix the two sources. The following diagram illustrates a few of the many types of connections possible with the SCM268. Note that nothing is connected to the channel 4 microphone input (MIC LEVEL INPUT 4).
INSTALLATION SUPPLIED HARDWARE ENGLISH • • • • • • • • 4 rubber feet. For stand-alone installation. 1 rackmount bracket, long. For half-rack (single unit) installations. 1 rackmount bracket, short. For half-rack (single) or dual-mount installations. 2 straddle brackets. For dual-mount or fixed installations. 12 bracket screws, 1/4 in. (6 mm). For securing the brackets to the chassis. 4 rackmount screws, 1 in. (2.5 cm). For mounting the unit in a rack. 4 plastic washers.
INTERNAL MODIFICATIONS WARNING! Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified service personnel. DISASSEMBLY The following table lists the low-cut frequency corners for some of the most common capacitor values: Capacitor Value (μF) .033 .047 .068 .1 .22 .33 .47 .68 1.0 2.2 PHANTOM POWER DISABLE KNOB ASSEMBLY FIGURE 2 3. 4. 5.
SPECIFICATIONS ENGLISH Measurement Conditions (unless otherwise specified): Line voltage 120 Vac, 60 Hz (SCM268) or 230 Vac, 50 Hz (SCM268E); full gain; 1 kHz, one channel activated; source impedances: Mic 150 Ω, Aux Level 150 Ω; terminations: Line 600 Ω, Mic 600 Ω, Aux Out 10 kΩ. 12 V phantom power off. Polarity All inputs to all outputs are non-inverting Overload and Shorting Protection Shorting outputs, even for prolonged periods, causes no damage.
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 SHURE Incorporated http://www.shure.com 미국 , 캐나다 , 중남미 , 카리브해 지역 : 5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.