Shure DJ Equipment SCM262 User Manual

Model SCM262 User Guide  
SCM262  
STEREO MIXER  
MÉLANGEUR STÉRÉO  
STEREOMISCHER  
MEZCLADORA ESTEREOFONICA  
MIXER STEREO  
©2012 Shure Incorporated  
27A15638 (Rev. 2)  
Printed in U.S.A.  
 
SHURE SCM262  
DESCRIPTION  
The Shure Model SCM262 is a stereo mixer intended for sound rein-  
forcement applications that integrate microphones with consumer stereo  
products. It incorporates two active-balanced microphone inputs with  
three unbalanced stereo aux level inputs.  
The SCM262 Stereo Mixer is designed for restaurants, classrooms,  
corporate training, aerobics classes, and other situations where a paging/  
public announcement system is combined with background music or oth-  
er program material.  
FEATURES  
Designed to combine paging with background music.  
One active-balanced, XLR microphone input channel.  
One active-balanced XLR microphone and 1/4-in. TRS line in-  
put channel.  
Three STEREO INPUT channels  
Stereo AUX level OUTPUTs  
BASS and TREBLE tone controls on the master output.  
1/2-rack chassis.  
12 V phantom power for condenser microphones.  
Internal power supply.  
Removable power cable.  
Ducking function (defeatable).  
Stereo MIC/LINE OUTPUTs  
Jukebox mute function (defeatable).  
FRONT PANEL  
2
3
4
5
1
6
MIC Channel Gain Controls, 1-2. Control the gain levels of  
POWER Indicator. Lights up to indicate when the unit is  
the MIC channels and LINE IN 2 (MIC 2).  
plugged in and receiving power.  
NOTE: The SCM262 does not have a 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.  
STEREO Channel Gain Controls, 1-3. Control the gain lev-  
els from CD players, juke boxes, VCRs, or other consumer  
stereo equipment connected to the STEREO inputs.  
BASS and TREBLE Controls. Control the boost/cut of the  
low- and high-frequency of the shelving filters.  
POWER Switch  
NOTE: Country dependent  
MASTER Gain Control. Allows adjustment of the overall out-  
put gain.  
REAR PANEL  
1
2
3
4
5
6
7
Power Connector. Accepts 100-120 Vac (SCM262) or 220-  
Left/Right STEREO INPUTS, 1-3. These phono jacks are  
240 Vac (SCM262E).  
stereo inputs for connection to consumer stereo devices.  
Left/Right MIC/LINE Output Connectors. These 1/4-in. con-  
nectors are stereo, balanced outputs for use with professional  
audio equipment. Controlled by DIP switch.  
MIC Channel 2 INPUT.  
Microphone channel 2 has two  
available inputs. There is a 1/4-in. connector for balanced/  
unbalanced line-level connections, or an XLR connector for  
balanced mic-level connections.  
Left/Right AUX Output Connectors. These phono jacks are  
stereo, unbalanced outputs for use with consumer stereo  
equipment.  
MIC Channel 1 INPUT. This is an XLR connector for bal-  
anced mic-level connections.  
DIP Switches. These allow you to adjust the SCM262 for  
specific applications. See DIP Switches.  
5
 
DIP SWITCHES  
DIP  
SWITCH  
FUNCTION  
POSITION  
UP  
UP (default)  
Line  
DOWN  
1
2
3
4
5
6
7
LEFT OUTPUT MIC/LINE  
RIGHT OUTPUT MIC/LINE  
MIC 1 DUCKING  
Mic  
Line  
Off  
Off  
 
Off  
Off  
Mic  
On  
On  
DOWN  
MIC 2 DUCKING  
DUCKING LEVEL  
–20 dB  
On  
STEREO 3 JUKEBOX MUTE  
12 V PHANTOM  
On  
6
1
2
3
4
5
7
LEFT/RIGHT OUTPUT MIC/LINE: DIP switches 1 and 2 adjust the left  
and right outputs for line- or mic-level operation.  
STEREO 3 JUKEBOX MUTE: This DIP switch turns the Juke Box  
Mute feature on or off. When on, any source connected to STEREO 3 will  
mute STEREO 1 and 2 inputs.  
MIC 1/MIC 2 Ducking: When ducking is on, the SCM262 will automat-  
ically lower the gain of all STEREO inputs when someone is speaking into  
one of the microphones.  
PHANTOM POWER: When in the down position, this switch activates  
a 12 V phantom power source for condenser microphones. Phantom  
power does not affect the operation of balanced, dynamic microphones,  
so one can be connected to the SCM262 in combination with a condenser  
microphone.  
DUCKING LEVEL: Adjusts the amount of STEREO channel gain re-  
duction when ducking is activated.  
APPLICATIONS  
General Application  
so the talker can be heard more clearly. Once the talker is finished, the  
music resumes.  
This is a general setup for most situations which require the combined  
use of professional microphones and consumer stereo equipment. Using  
this general setup, there are several other options available for further ad-  
justing the SCM262 for your sound system. See the diagram on the fac-  
ing page.  
NOTE: Use a microphone with an ON/OFF or pushbutton  
switch for the Paging with Ducking Application. A microphone  
without a switch will false-trigger, causing unwanted  
interruptions in the program material.  
1. Turn all gain controls counterclockwise.  
1. Connect the SCM262 to the sound system as described in Gen-  
eral Application.  
2. Set DIP switch 3 or 4 to the down position to activate ducking for  
microphone channel 1 or 2, respectively.  
2. Connect L/R STEREO INPUTS of the SCM262 to the L/R stereo  
outputs of the desired stereo audio equiment (CD players, VCRs,  
televisions, juke boxes, etc.).  
3. Connect microphone(s) to the MIC INPUTS on the SCM262.  
4. For microphones which require phantom power, such as con-  
denser microphones, place DIP switch 7 in the down position  
(phantom power on).  
5. Connect the L/R outputs of the SCM262 to the L/R inputs of the  
amplifier.  
3. Set DIP switch 5 position. The Down position sets the ducking so  
that the program sound is lowered 20 dB when someone uses a  
microphone. The Up position sets the ducking so that the pro-  
gram sound is muted when someone uses a microphone.  
Jukebox Mute Application  
In this application, designed primarily for Jukeboxes, any sound  
source connected to the STEREO 3 channels will automatically mute any  
sound coming over the STEREO 1 and 2 channels. This way, a CD play-  
er can be playing music, and then when someone plays a song on the  
Jukebox, the SCM262 will automatically mute the CD player channels  
and switch to the Jukebox. STEREO 1 and 2 channels will remain muted  
for about 30 seconds after program material is finished, to allow the juke-  
box time to move on to the next song.  
NOTE: If you are using a consumer stereo amplifier, use the  
AUX OUTs. If you are using a professional audio power  
amplifier, use the LINE OUTs. The MIC/LINE and AUX  
OUTPUTs can be used simultaneously to feed two separate  
amplifiers.  
6. Apply power to the mixer by connecting the supplied power cable  
between the power connector on the mixer and the appropriate  
AC power supply. The green POWER LED will illuminate to indi-  
cate that the mixer is powered on.  
1. Connect the SCM262 to the sound system as described in Gen-  
eral Application.  
*NOTE: The SCM262 has no power switch. It is designed to  
be plugged into a power strip which supports the whole sound  
system. A typical power strip will have a power switch, so that  
when the power strip is powered on, the SCM262 is powered  
on.  
2. Connect the L/R audio outputs of the jukebox to the L/R inputs of  
STEREO 3.  
NOTE: This feature is designed especially for use with  
jukeboxes, but will work for any equipment connected to  
STEREO 3.  
*Power Switch, country dependent.  
3. Set DIP Switch 6 to the down position (Jukebox Mute on).  
Paging with Ducking Application  
NOTE: If the ducking application is used in conjunction with the  
Jukebox Mute application, then activated microphones will  
mute or duck the STEREO 3 input.  
With Ducking on, the SCM262 will automatically sense when someone  
is talking into one of the microphones and lower the volume of the music  
6
 
CONNECTIONS  
MIC INPUT 2  
WIRELESS MICROPHONE SYSTEM  
MIC INPUT 1  
MICROPHONE  
AUX INPUTS  
AUX INPUT 3  
JUKEBOX  
AUX INPUTS  
TELEVISION  
CD PLAYER  
OR  
L
AM/FM RECEIVER  
VCR  
OR  
R
TAPE DECK  
R
L
R
L
L/R AUX OUTPUTS  
L/R MIC/LINE  
OUTPUTS  
POWER SUPPLY  
VIDEO CAMERA  
R
L
OR  
OR  
R
L
CONSUMER  
STEREO  
AMPLIFIER  
PROFESSIONAL  
AUDIO POWER  
AMPLIFIER  
OR  
VCR  
OR  
TAPE DECK  
LOUDSPEAKERS  
LOUDSPEAKERS  
7
 
INTERNAL MODIFICATIONS  
WARNING! Voltages in this equipment are hazardous to life. No user-serviceable parts  
inside. Refer all servicing and modifications to qualified service personnel.  
DISASSEMBLY  
To access the printed circuit board (pc board) for internal modifica-  
tions, use the following steps:  
To remove MIC 2/LINE 2 from the left outputs, remove R910. To re-  
move MIC 2/LINE 2 from the right outputs, remove R911.  
1. Unplug the power cord.  
2. Remove the knobs and retainer nuts from the front panel.  
Low-Cut Filter  
To eliminate the 80 Hz, low-cut filter, remove resistor R501 (mic 1), or  
resistor R519 (mic 2). Place a 10 to 33 F capacitor in X501 (mic 1) or  
R502 (mic 2). The polarity of the capacitor does not matter.To change the  
frequency of the low cut filter, remove resistor R501 (mic 1) or R519 (mic  
2), and place the proper capacitor into X501 (mic 1) or X502 (mic 2) to get  
the desired corner frequency.  
The following tables list the low-cut frequency corners for some of the  
most common capacitor values:  
Capacitor  
Value  
Corner  
Capacitor  
Value  
Corner  
3. Remove the two screws at each bottom corner of the front panel.  
4. Remove the four screws at each corner of the back panel.  
5. Slide the back panel and pc board out from the rear of the chas-  
sis.  
Frequency  
Frequency  
.033 F  
.047 F  
.068 F  
.1 F  
803 Hz  
564 Hz  
390 Hz  
265 Hz  
120 Hz  
.33 F  
.47 F  
.68 F  
1.0 F  
2.2 F  
80 Hz  
56 Hz  
39 Hz  
26.5 Hz  
12 Hz  
CAUTION: When reassembling the SCM262, DO NOT  
OVERTIGHTEN the knob retainer nuts. Use a minimal amount  
of force to secure the nut (0.6-0.8 Nm (5-7 inlb)). Damage to  
the internal components will result if too much force is used.  
.22 F  
Ducking Depth  
This modification adjusts the level of ducking depth attenuation of the  
input channels when ducking is activated.  
Mono Mixer Modification  
This modification allows all the inputs to be mixed to a single mono sig-  
nal sent over both the left and right outputs.  
The aux ducking depth may be changed by removing resistor R213  
and inserting a resistor into jumper X202. Use the following tables to de-  
termine the proper resistor value for the desired ducking depth.  
Short jumper X203.  
Phantom Power Disable  
Ducking  
Depth  
Resistor  
Value  
Ducking  
Depth  
Resistor  
Value  
This modification disables the phantom power per channel.  
6 dB  
9 dB  
4,000   
5,000   
7,500   
10,000   
12,000   
15,000   
36 dB  
42 dB  
47 dB  
50 dB  
55 dB  
20,000   
25,000   
30,000   
33,000   
40,000   
To disable the phantom power from mic 1, remove resistor R121. To  
disable the phantom power from mic 2, remove resistor R122.  
15 dB  
20 dB  
24 dB  
29 dB  
15 dB Mic Preamplifier Pad  
When a microphone has an extremely high signal, getting the desired  
gain might be difficult -- a small turn of the gain control might change the  
sound from a whisper to deafeningly loud. This modification adds a 15 dB  
Mic preamplifier pad to allow more accurate gain adjustment with ex-  
tremely high microphone signals.  
Ducking Threshold  
This modification adjusts the threshold for activating the ducking cir-  
cuit.  
Remove R160 (mic 1) or R183 (mic 2).  
The ducking threshold can be raised or lowered by first removing re-  
sistor R333, and then placing a resistor (R) at jumper X303. To lower the  
ducking threshold, use a resistor value (R) less than 2k ohms. To raise  
the ducking threshold, use a resistor value (R) greater then 2k ohms.  
Hard Panning MIC Channels  
To remove MIC 1 from the left outputs, remove R912. To remove MIC  
1 from the right outputs, remove R913.  
8
 
INSTALLATION  
2. Attach the short rackmount brackets to the outsides of the com-  
SUPPLIED HARDWARE  
bined units with eight (8) of the bracket screws.  
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.  
1
12 bracket screws, / -in. (6 mm). For securing the brackets  
4
to the chassis.  
4 rackmount screws, 1 in. (2.5 cm). For mounting the unit in  
a rack.  
4 plastic washers. For use with the supplied rackmount  
screws.  
4 wood screws, 1/2 in. (1.25 cm). For fixed installations  
3. After attaching the brackets, mount the unit in an equipment rack  
using the supplied rackmount screws and plastic washers.  
Bracket Screw  
Wood Screw  
Rackmount Screw  
STAND-ALONE INSTALLATION  
RACKMOUNT INSTALLATION  
1. 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.  
The SCM262 can be mounted as a single unit or dual-mounted with ei-  
ther another SCM262 or another Shure half-rack unit such as the  
SCM268 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 SCM262 with  
eight (8) of the supplied bracket screws.  
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.  
Dual-mounted installation:  
2. Fasten the straddle brackets to the surface using the four (4) sup-  
plied wood screws.  
1. Connect the 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.  
TOP MOUNT  
HANGING MOUNT  
9
 
SPECIFICATIONS  
Measurement Conditions (unless otherwise specified):Tone controls  
Ducking  
Mic channels 1 and 2 Levels .................................... –20 dB or –dB  
Activation time ............................................................. 10 ms (typical)  
Mic Deactivation time ........................................................ 2 s (typical)  
Jukebox Mute Deactivation Time .................................... 30 s (typical)  
centered; Line voltage 120 Vac, 60 Hz (SCM262) or 230 Vac, 50 Hz  
(SCM262E); full gain; 1 kHz, one channel activated; source impedances:  
Mic 150 ; Line/Aux 40 , terminations: Line/Mic/Aux 20 k  
Phantom Power  
12 Vdc open-circuit through 680 resistors  
Operating Voltage  
SCM262: 100—120 Vac, 50/60 Hz, 60 mA  
SCM262E: 220—240 Vac, 50/60 Hz, 30 mA  
Temperature Range  
Frequency Response (Ref 1 kHz, channel and master controls  
centered)  
MIC/LINE Inputs: 150 Hz to 20 kHz 2 dB  
AUX Inputs: 20 Hz to 20 kHz 2 dB  
Low-Cut Filter (Microphone inputs only)  
3dB down at 80 Hz, 6 dB/octave  
Voltage Gain (typical, controls full clockwise)  
Operating...............................................–7to 49C (20to 120F )  
Storage.................................................–29to 74C (–20to 165F)  
Overall Dimensions  
43 x 218 x 162 mm (1.72 x 8.60 x 6.37 in.)  
Net Weight:1.1 kg (2 lbs, 5 oz)  
Output  
Input  
Mic  
Line  
Aux  
Low-impedance mic  
32 dB  
72 dB  
60 dB  
Certifications  
(150 )  
SCM262: UL, cUL listed by Underwriters Laboratories.  
Line  
–9 dB  
–5 dB  
31 dB  
35 dB  
19 dB  
23 dB  
SCM262E: Conforms to European Union directives, eligible to bear CE  
marking; Certified to EN 60 065; meets European Union EMC Immunity  
Requirements (EN 50082-1: 1992, EN 50082-2: 1992)  
Stereo  
Inputs  
Conforms to European Regulation (EC) No. 1275/2008, as amended.  
Impedance  
The CE Declaration of Conformity can be obtained from Shure  
Incorporated or any of its European representatives. For contact  
Designed  
Actual  
(typical)  
Input  
Clipping Level  
Input  
Mic (XLR)  
Line  
for use with  
<600   
<10 k  
<2 k  
1.4 k  
155 k  
21 k  
–16 dBV  
+24 dBV  
>28 dBV  
The CE Declaration of Conformity can be obtained from:  
ww.shure.com/europe/compliance  
Authorized European representative:  
Shure Europe GmbH  
Stereo  
Headquarters Europe, Middle East & Africa  
Department: EMEA Approval  
Jakob-Dieffenbacher-Str. 12  
Outputs  
75031 Eppingen, Germany  
Impedance  
Phone: 49-7262-92 49 0  
Designed for  
use with  
Actual  
(typical)  
Output  
Fax: 49-7262-92 49 11 4  
Output  
Mic  
Clipping Level  
Replacement Parts  
> 600   
>5k   
3   
–22 dBV  
+18 dBV  
+5 dBV  
Knob, Master (blue) ............................................... 95B8752  
Knob, Channel Gain (white)................................... 95A8752  
Line (Power) Cords:  
Line  
300   
1.5k   
Aux  
10 k  
SCM262: 100—120 Vac (US/Canada) ............. 95B8762  
SCM262E: 220—240 Vac (EU)......................... 95B8778  
Fuse:  
Total Harmonic Distortion  
<0.25% at +4 dBu output level, (through 22 Hz—22 kHz filter; MIC Input  
1 and Master at center, all other controls full counterclockwise)  
SCM262 (5x20 mm, 250V,  
Equivalent Input Noise (150 source; A-Weighted)  
100mA, time delay) ............................................ 80Z730  
SCM262E (5x20 mm, 250V,  
–128 dBV  
Output Noise (channel controls full counterclockwise,  
A-Weighted)  
Master full counterclockwise.................................................. –95 dBV  
Master full clockwise.............................................................. –59 dBV  
Common Mode Rejection  
>70 dB at 1 kHz  
Polarity  
All inputs to all outputs are non-inverting.  
Overload and Shorting Protection  
Shorting outputs, even for prolonged periods, causes no damage.  
Microphone inputs are not damaged by signals up to +10 dBV; Line and  
Aux inputs by signals up to +28 dBV  
40mA, time delay).............................................. 80M258  
Hardware Kit .......................................................90AW8100  
Link Bars (Bracket) ................................................ 53B8443  
Single Mount Bracket............................................. 53A8484  
Dual Mount Bracket .............................................. 53E8484  
Optional Accessories  
Line (Power) Cord, 230—240 Vac (UK)................. 95A8713  
Service Statement  
For additional service or parts information, please contact Shure's  
Service department at 1-847-600-8699. Outside the United States,  
please contact your authorized Shure Service Center.  
Equalization  
Bass (Low-frequency shelving,  
corner frequency at 250 Hz)  6 dB  
Treble (High-frequency shelving,  
corner frequency at 4 kHz)  6 dB  
10  
 
United States, Canada, Latin  
America, Caribbean:  
Shure Incorporated  
Asia, Pacific:  
Europe, Middle East, Africa:  
Shure Asia Limited  
22/F, 625 King’s Road  
North Point, Island East  
Hong Kong  
Shure Europe GmbH  
Jakob-Dieffenbacher-Str. 12,  
75031 Eppingen, Germany  
5800 West Touhy Avenue  
Niles, IL 60714-4608 USA  
Phone: 847-600-2000  
Fax: 847-600-1212 (USA)  
Fax: 847-600-6446  
Phone: 49-7262-92490  
Fax: 49-7262-9249114  
Phone: 852-2893-4290  
Fax: 852-2893-4055  
©2011 Shure Incorporated  
 

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