Shure SCM268E User's Manual
Contents
1. STAND ALONE INSTALLATION Adhere the four 4 supplied rubber feet to the bottom of the unit at each corner This will keep it from sliding and protect the table surface FIXED INSTALLATION To permanently affix the SCM262 above or below a table shelf or counter top use the following steps 1 Fasten the straddle brackets to the recessed edges of the chassis using four 4 bracket screws Top mount Fasten the straddle brackets to on the bottom of the unit Hanging mount Fasten the straddle brackets to the top of the unit 2 Fasten the straddle brackets to the surface using the four 4 sup plied wood screws HANGING MOUNT INTERNAL MODIFICATIONS WARNING Voltages in this equipment are hazardous to life No user serviceable parts inside Refer all servicing to qualified service personnel DISASSEMBLY To access the printed circuit board pc board for internal modifications use the following steps 1 Unplug the power cord 2 Remove the knobs and retainer nuts from the front panel See Figure 2 KNOB ASSEMBLY FIGURE 2 3 Remove the four screws at each corner of the back panel Remove the two screws at each bottom corner of the front panel 5 S2. Model SCM268E User Guide MASTER UX IN 9 4 2 3 2 e 6 lt R e ouTPUTLEVELMETE S e Sx 10 18 20 10 hone mixer V SHURE SCM268 microp SCM268E Four channel Microphone Mixer VU MB Se KIE ds 4 0013 SI AI 2008 Shure Incorporated Printed in U S A 27458880 Rev 2 IA ANTAL AA TABLE OF CONTENTS ENGLISH eee eee RE E SR SQUE AR CAU I T ea od uS edo 4 CONNECTIONS numer Per Sucesos dec tatur mee Mee ien etel 7 INSTALLATION ii zen erbe der hex eti Fa eee edi dir erste eia 8 INTERNAL MODIFICATIONS 1 4 4 9 SPECIFICATIONS as Sag Pici eee PER qued eg 10 H3 EIE buco e Wee e s tete e Boe uh ee eae us 1i Eat dx I de i dod Ao Me de do decode be 14 se pc nu Sae 15 UE od de D dr Dade de 4 16 EA gib patios S db UA 17 Quae d eM v cedet Lari E ed e eo 20 ENGLISH IMPORTANT SAFETY INSTRUCTIONS READ these instructions KEEP these instructions HEED all warnings FOLLOW all instructions DO NOT use this apparatus near wa
3. 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 SHURE Incorporated hfip www shure com MEX 7 MAGE ta Os WUC 21018100 5800 W Touhy Avenue Niles IL 60714 4608 U S A 847 600 2000 0 HA 847 000 1812 SI HA 847 600 8446 SE EAT 2000 NAT FO 002 12 A te M1047 509 6040 G8 Z5 01572131 BC PAR Shure Europe GmbH 3 49 7131 72140 49 7131 721414 Shure Europe GmbH Aig 49 7131 72140 49 7131 721414 OLALOL ciue MN Shure Asia Limited 272 852 2893 4290 852 2893 4055 Sous dte 852 2993 4005
4. ated nominal 50 60 Hz 30 mA 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 218 mm W x 162 mm D 1 72 x 8 60 x 6 37 inches Net Weight 1 20 Kg 2 Ibs 10 oz Certifications SCM268 UL amp cUL LISTED by Underwriters Laboratories Inc SCM268E Eligible to bear CE Marking Conforms to European EMC Directive 89 336 EEC Meets applicable tests and perfor mance criteria in European Standard EN55103 1996 parts 1 and 2 for residential E1 and light industrial E2 environ ments Replacement Parts Knob Master 95B8752 Knob Channel Gain white 95A8752 Line Power Cords SCM268 100 120 Vac US Canada 95A8762 SCM268E 220 240 Vac 95A8778 SCM268E Australia New Zealand 95A9128 Fuse SCM268 5x20 mm 250V 80mA 5 80A730 Fuse SCM268E 5x20 mm 250V 40mA slow blow eee 80J258 Hardware Kit endi Sabin RR 90AF8100 Link Bars Bracket 53A8443 Single Mount 53A8484 Dual Mount Bracket 53B8484 Optional Accessories Line Power Cord 230 240 Vac UK 95A8713 SHURE SHURE Incorporated http www shure com United States
5. e chassis 4rackmount screws 1 in 2 5 cm For mounting the unit in a rack 4 plastic washers For use with the supplied rackmount Screws 4wood screws 1 2 in 1 25 cm For fixed installations Bracket Screw M Wood Screw Rackmount Screw RACKMOUNT INSTALLATION The SCM268 can be mounted as a single unit or dual mounted with either another SCM268 or another Shure half rack unit such as the SCM262 or DFR11EQ Attach the rackmount brackets using one of the following methods Single unit half rack installation 1 Attach the short and long rackmount brackets to the SCM268 with eight 8 of the supplied bracket screws T T 1 4 21471 1 1 1 Dual mounted installation 1 Connectthe two units together side by side using two 2 straddle brackets The brackets should straddle the recessed edges on on the top and bottom of each chassis Fasten them using eight 8 bracket screws NOTE Be sure to use both straddle brackets one on the top and one on the bottom 2 Attach the short rackmount brackets to the outsides of the com bined units with eight 8 of the bracket screws T 3 After attaching the brackets mount the unit an equipment rack using the supplied rackmount screws and plastic washers
6. en microphone input remove the spec ified resistor and short the solder points at the specified pc board loca tions Refer to the following table Short Solder Points R12 R13 R15 X11 and X14 R22 R23 R25 X21 and X24 R32 R33 R35 X31 and X34 R42 R43 R45 X41 and X44 HOT MIC PAD Some condenser mics have a high output In order to avoid overdriving the input stage the user may need to set the input pot lower than desired To fix this problem the user can place an 11 dB pad into the input gain stage of a selected channel 1 Twist together the leads from one side of a 15 resistor and 0 1 uF capacitor 15 0 1 MF 2 Solderthe free ends of the resistor capacitor combination into the holes at the jumper position indicated by the following table and remove the corresponding surface mount resistor Channel Remove Insert Resistor Capacitor Resistor Combination at Jumper 7 27 47 X37 HSITONA SPECIFICATIONS 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 Q Aux Level 150 Q terminations Line 600 Q Mic 600 Q Aux Out 10 12 V phantom power off ENGLISH Frequency Response Ref 1 kHz controls centered Microphone Inputs 150 Hz to 20 Khz 2 dB built in 80Hz low cut Auxiliary Inputs 20 Hz to 20 kHz 2 dB Low Cut Filter Microphone inpu
7. f balanced dynamic microphones With phantom power on they can be connected to the SCM268 in combination with condenser microphones that do use it OUTPUT LEVEL SWITCH The output level switch on the back panel MIC LINE OUT sets the level of the balanced XLR output When set to MIC it reduces the output by about 50 dB Set the switch so that the output level matches the input lev el of the device to which you are connecting the SCM268 The switch is recessed to prevent accidental engagement NOTE The output level switch does not affect the auxiliary output AUX OUT level Use the master gain control MASTER to adjust peak levels as indicated by the LEDs The red LED illuminates when the output is 2 dB below clip ping GREEN Nominal RED Clip OUTPUT LEVEL METER QVE NOVO a 20 10 0 46 12 18 lt q Peak in dBu MIC LEVE ES OFF ON 4 3 ITOM Phantom Power Switch AUX LEVEL INPUTS AUX IN 3 1 OUTPUTS AUX OUT MIC LINE LEVEL AUX LEVEL INPUTS AUX IN 3 1 OUTPUTS LINE Output Level Switch CONNECTIONS The following diagram illustrates a few of the many types of connections auxiliary level input AUX LEVEL INPUT 4 Connecting both auxiliary lev possible with the SCM268 Note that nothing is connected to the channel el and microphone level inputs to a single channel is not recommended 4 microphone input MIC LEVEL INPUT 4 This is because channel 4 is beca
8. 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 mi crophone input MIC LEVEL INPUT 1 and the channel 1 auxiliary level input AUX LEVEL INPUT 1 The auxiliary gain control knob AUX IN af fects only the auxiliary input AUX IN OUTPUT GAIN The master output gain control knob MASTER adjusts gain to both the XLR balanced output MIC LINE LEVEL and the auxiliary level output AUX LEVEL Auxiliary Channel Channel 3 MASTER O OUTPUT LEVEL METER n o OO O0 000 O 20 0 46 2 gt renes n Sn CM268 microphone mixer Channel 2 Channel 4 Master Output GAIN CONTROL FIGURE 1 OUTPUT LEVEL METER The six LEDs on the front panel labeled OUTPUT LEVEL METER illumi nate to reflect the peak level of the mixed output signal from the SCM268 in reference to balanced line output in dBu 0 dBu 0 775 V PHANTOM POWER When the phantom power switch on the back panel is on 12V PHAN TOM ON the SCM268 provides 12 V of phantom power to each XLR mi crophone input The switch is recessed to prevent accidental engagement Most condenser microphones require phantom power Use it when connecting these types of microphones to the SCM268 NOTE Phantom power does not affect the operation o
9. lide the back panel and pc board out from the rear of the chas sis CAUTION When reassembling the SCM268 DO NOT OVERTIGHTEN the knob retainer nuts Use a minimal amount of force to secure the nut 0 6 0 8 5 7 in Ib Damage to the internal components will result if too much force is used LOW CUT FILTER To bypass the built in low cut filter for a given channel remove the spec ified resistor and place 10uF to 33uF capacitor in the specified pc board location polarity does not matter Refer to the following table Channel Remove Resistor from Place 10uF to 33uF Capacitor in To select a particular corner frequency for the low cut filter remove the R18 R28 R38 or R48 resistor for a given channel as specified above Then in the corresponding pc board location X17 X27 X37 or X47 place a capacitor of the specified value polarity does not matter Refer to the following formula for selecting the correct capacitor value for the de sired corner frequency 265 where C value of capacitor in uF F corner frequency 3 bB for low cut filter in Hz The following table lists the low cut frequency corners for some of the most common capacitor values Capacitor Value uF Low Cut Frequency Corner Hz PHANTOM POWER DISABLE To disable phantom power for a given microphone input remove the specified resistor as listed in the following table LINE PAD To insert a 50 dB line pad for a giv
10. lity with low noise and a flat frequency response Versatile in all types of applications the SCM268 integrates transform er balanced XLR inputs a switchable microphone line level transform er balanced XLR output phono jack inputs and output phantom power 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 FRONT PANEL and an auxiliary input channel It can function as a primary or add on mix er for sound reinforcement recording broadcast or audio visual presen tation systems With the supplied hardware the mixer s half rack chassis mounts secure ly in single or dual rackmount installations For fixed installations the SCM2668 can be fastened on or below a shelf counter or tabletop Built in 12 volt phantom power Internal power transformer Built in low cut filter on microphone inputs below 80 Hz 1 2 3 4 AUX IN MASTER O o o o o 10 RO EO O 1 E20 10 0 6 2 8 POWER SHUR S SCM268 microphone mixer 9 Gain Controls 1 4 Adjusts gain for microphone level inputs and auxiliary level inputs 1 4 Auxiliary Channel Gain Control AUX IN Adjusts the auxiliary channel input gain Output Meter LED
11. meter indicates peak output signal level REAR PANEL Master Gain Control MASTER Adjusts overall output level Power Indicator POWER This LED illuminates when the unit is plugged in and receiving power NOTE The SCM268 does have power switch To turn the unit off unplug the power cord or use an external power strip with a switch However it can remain plugged in as it uses very little power when idle MIC LEVEL INPUTS Power Connector Accepts 100 120 Vac SCM268 or 220 240 Vac 5 268 Output Connector MIC LINE OUT Transformer bal anced XLR output connector Switchable between line and microphone level o o Output Level Switch MIC LINE OUT Recessed switch changes the signal level of the XLR output connector In Microphone Level Out Line Level Auxiliary Output Connector AUX OUT Phono jack feeds consumer level audio equipment Not affected by MIC LINE switch Auxiliary Level Inputs AUX LEVEL INPUTS 1 4 Phono jacks connect to consumer level audio sources Auxiliary Input Channel AUX IN A dedicated auxil iary level input for the auxiliary channel Phantom Power Switch 12V PHANTOM Recessed switch turns on phantom power for microphone inputs 1 4 Microphone Level Inputs MIC LEVEL INPUTS Trans former balanced microphone level XLR inputs HSITONA ENGLISH GAIN CONTROL INPUT GAIN The gain control knobs 1 4 located on the
12. or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped DO NOT expose the apparatus to dripping and splashing DO NOT put objects filled with liquids such as vases on the apparatus The MAINS plug or an appliance coupler shall remain readily operable The airborne noise of the apparatus does not exceed 70dB Apparatus with CLASS construction shall be connected to a MAINS socket outlet with a protective earthing connection To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Do not attempt to modify this product Doing so could result in personal injury and or product failure This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit WARNING Voltages this equipment are hazardous to life user serviceable parts inside Refer all servicing to qualified service personnel safety certifications do not apply when the operating voltage is changed from the factory setting SHURE SCM268 DESCRIPTION The Shure Model 5 268 is transformer balanced four channel mi crophone mixer Its simple compact design delivers superior perfor mance and exceptional sound qua
13. ter CLEAN ONLY with dry cloth DO NOT block any ventilation openings Install in accordance with the manu facturer s instructions 8 DO NOT install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 9 DO NOT defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wider blade or the third prong are provided for your safety If the provided plug does not fit into your out let consult an electrician for replacement of the obsolete outlet 10 PROTECT the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 ONLY USE attachments accessories specified by the manufacturer LOO ROM 12 13 14 15 16 17 18 19 20 USE only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over UNPLUG this apparatus during lightning storms or when unused for long periods of time REFER all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is dam aged liquid has been spilled
14. ts only 3dB down at 80 Hz 6 dB octave Gain typical controls full clockwise Input Output Mic Line Aux Out Low impedance mic 38 dB 76 dB 65 dB 150 Q Aux Level 3 dB 40 dB 29 dB Inputs Input Impedance Designed for Actual Input use with typical Clipping Level Mic 19 600 Q 1 2 5 dBV Aux Level lt 2 21 228 dBV Outputs Output Impedance Designed for Actual Output use with typical Clipping Level Mic low Z inputs 020 21 dBV Line 2600 Q 720 18 dBV Aux Out 22kQ 870Q 7 dBV Total Harmonic Distortion 0 2596 at 4 dBu output level through 22 Hz 22 kHz filter Input 1 and Master centered all other controls full counter clockwise Equivalent Input Hum and Noise 150 source through 22 Hz 22 kHz filter 124 dBV Output Hum and Noise through 22 Hz 22 kHz filter chan nel controls full counterclockwise Master full counterclockwise 92 dBV Master full clockwise 70 dBV Common Mode Rejection gt 80 dB at 1 kHz 10 Polarity All inputs to all outputs are non inverting Overload and Shorting Protection Shorting outputs even for prolonged periods causes no dam age Microphone inputs not damaged by signals up to 10 dBV Auxiliary inputs by signals up to 36 dBV Phantom Power 12 open circuit through 3400 series resistance Operating Voltage 5 268 100 120 Vac rated nominal 50 60 Hz 60 mA 5 268 220 240 Vac r
15. use the SCM268 would not be able to independently mix the two being used for the consumer level equipment connected to the channel 4 Sources AUX IN CHANNEL 4 CHANNEL 3 CHANNEL 2 CHANNEL 1 CONSUMER LEVEL CONSUMER LEVEL DYNAMIC CONDENSER DYNAMIC EQUIPMENT EQUIPMENT MICROPHONE MICROPHONE MICROPHONE f OO CD PLAYER OR AM FM RECEIVER OR or LI 151 j TAPE DECK EE POWER SUPPLY AMPLIFIER LINE OUT AUX OUT HSITONA ENGLISH INSTALLATION SUPPLIED HARDWARE 4 rubber feet For stand alone installation 1 rackmount bracket long For half rack single unit instal lations 1 rackmount bracket short For half rack single or du al mount installations 2 straddle brackets For dual mount or fixed installations 12 bracket screws 1 4 in 6 mm For securing the brackets to th
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