Shure Microphone SCM268E User Manual

Model SCM268E User Guide  
ER  
AST  
M
N
I
AUX  
4
3
2
1
R
E
T
ME  
LEVEL  
UT  
0
P
OUT  
R
E
POW  
8
+1  
2
+1  
+6  
0
-1  
0
-2  
r
e
x
mi  
ophone  
cr  
mi  
268  
M
SC  
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
目录  
中文. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
连接 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
安装 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
规格 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
목차  
한국어 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
연결 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
설치 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
사양 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
3
 
ENGLISH  
! IMPORTANT SAFETY INSTRUCTIONS !  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
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 manu-  
facturer's instructions.  
DO NOT install near any heat sources such as radiators, heat registers, stoves,  
or other apparatus (including amplifiers) that produce heat.  
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.  
USE only with a cart, stand, tripod, bracket, or table  
12.  
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.  
13. UNPLUG this apparatus during lightning storms or when unused for long periods of  
time.  
14. 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 or objects have fallen into the apparatus, the apparatus  
has been exposed to rain or moisture, does not operate normally, or has been  
dropped.  
8.  
9.  
15. DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled  
with liquids, such as vases, on the apparatus.  
16. The MAINS plug or an appliance coupler shall remain readily operable.  
17. The airborne noise of the apparatus does not exceed 70dB (A).  
18. Apparatus with CLASS I construction shall be connected to a MAINS socket outlet  
with a protective earthing connection.  
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.  
19. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or  
moisture.  
20. Do not attempt to modify this product. Doing so could result in personal injury  
and/or product failure.  
This symbol indicates that there are important operating and  
maintenance instructions in the literature accompanying this unit.  
This symbol indicates that dangerous voltage constituting a  
risk of electric shock is present within this unit.  
WARNING: Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified service personnel. The  
safety certifications do not apply when the operating voltage is changed from the factory setting.  
4
 
SHURE SCM268  
DESCRIPTION  
The Shure Model SCM268 is a transformer-balanced, four-channel mi-  
crophone mixer. Its simple, compact design delivers superior perfor-  
mance and exceptional sound quality with low noise and a flat frequency  
response.  
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  
SCM268 can be fastened on or below a shelf, counter, or tabletop.  
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  
Built-in 12-volt phantom power  
Internal power transformer  
Built-in low-cut filter on microphone inputs (below 80 Hz)  
Six-segment LED output level meter  
FRONT PANEL  
1
2
3
4
5
Gain Controls (1-4). Adjusts gain for microphone level  
Master Gain Control (MASTER). Adjusts overall output  
1
2
3
4
5
inputs and auxiliary level inputs 1-4.  
level.  
Auxiliary Channel Gain Control (AUX IN). Adjusts the  
auxiliary channel input gain.  
Power Indicator (POWER). This LED illuminates when the  
unit is plugged in and receiving power.  
NOTE: The SCM268 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.  
Output Meter. LED meter indicates peak output signal  
level.  
REAR PANEL  
1
2
3
4
5
6
7
8
Power Connector. Accepts 100-120 Vac (SCM268) or  
Auxiliary Level Inputs (AUX LEVEL INPUTS, 1-4). Phono  
1
2
5
6
7
8
220-240 Vac (SCM268E).  
jacks connect to consumer-level audio sources.  
Output Connector (MIC/LINE OUT). Transformer-bal-  
anced XLR output connector. Switchable between line and  
microphone level.  
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.  
Output Level Switch (MIC/LINE OUT). Recessed switch  
changes the signal level of the XLR output connector:  
In = Microphone Level  
3
4
Microphone Level Inputs (MIC LEVEL INPUTS). Trans-  
former-balanced, microphone-level XLR inputs.  
Out = Line Level  
Auxiliary Output Connector (AUX OUT). Phono jack  
feeds consumer-level audio equipment. Not affected by  
MIC/LINE switch.  
5
 
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 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).  
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  
Channel 1  
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).  
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.  
RED-Clip  
GREEN-Nominal  
Peak in dBu  
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.  
OFF  
ON  
NOTE: Phantom power does not affect the operation of balanced  
dynamic microphones. With phantom power on, they can be connected to  
the SCM268 in combination with condenser microphones that do use it.  
Phantom Power Switch  
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.  
LINE  
MIC  
NOTE: The output level switch does not affect the auxiliary output (AUX  
OUT) level.  
Output Level Switch  
6
 
CONNECTIONS  
The following diagram illustrates a few of the many types of connections  
auxiliary level input (AUX LEVEL INPUT 4). Connecting both auxiliary lev-  
el and microphone level inputs to a single channel is not recommended  
because the SCM268 would not be able to independently mix the two  
sources.  
possible with the SCM268. Note that nothing is connected to the channel  
4 microphone input (MIC LEVEL INPUT 4). This is because channel 4 is  
being used for the consumer-level equipment connected to the channel 4  
AUX IN  
CHANNEL 4  
CHANNEL 3  
CHANNEL 2 CHANNEL 1  
CONSUMER-LEVEL  
EQUIPMENT  
CONSUMER-LEVEL  
EQUIPMENT  
DYNAMIC  
MICROPHONE  
CONDENSER  
MICROPHONE  
DYNAMIC  
MICROPHONE  
CD PLAYER  
OR  
AM/FM RECEIVER  
OR  
VCR  
TAPE DECK  
POWER SUPPLY  
OR  
OR  
AMPLIFIER  
70 V P.A.  
Â
Â
Â
Â
LOUDSPEAKERS  
LINE OUT  
AUX OUT  
7
 
INSTALLATION  
SUPPLIED HARDWARE  
2. Attach the short rackmount brackets to the outsides of the com-  
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.  
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. For use with the supplied rackmount  
screws.  
3. After attaching the brackets, mount the unit in an equipment rack  
using the supplied rackmount screws and plastic washers.  
4 wood screws, 1/2 in. (1.25 cm). For fixed installations.  
Bracket Screw  
STAND-ALONE INSTALLATION  
Wood Screw  
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.  
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.  
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.  
Dual-mounted installation:  
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  
8
 
INTERNAL MODIFICATIONS  
WARNING! Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified service personnel.  
The following table lists the low-cut frequency corners for some of the  
most common capacitor values:  
DISASSEMBLY  
To access the printed circuit board (pc board) for internal modifications,  
use the following steps:  
Capacitor Value (μF)  
Low-Cut Frequency Corner (Hz)  
.033  
.047  
.068  
.1  
803  
564  
390  
265  
120  
80  
1. Unplug the power cord.  
2. Remove the knobs and retainer nuts from the front panel (See  
Figure 2).  
.22  
.33  
.47  
.68  
1.0  
2.2  
56  
39  
26.5  
12  
KNOB ASSEMBLY  
PHANTOM POWER DISABLE  
FIGURE 2  
To disable phantom power for a given microphone input, remove the  
specified resistor as listed in the following table:  
3. Remove the four screws at each corner of the back panel.  
4. Remove the two screws at each bottom corner of the front panel  
Channel  
Remove Resistor:  
5. Slide the back panel and pc board out from the rear of the chas-  
sis.  
1
2
3
4
R15  
R25  
R35  
R45  
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 Nm (5-7 inlb)). Damage to the internal components will result if  
too much force is used.  
LINE PAD  
To insert a 50 dB line pad for a given microphone input, remove the spec-  
ified resistor and short the solder points at the specified pc board loca-  
tions. Refer to the following table:  
LOW-CUT FILTER  
To bypass the built-in low-cut filter for a given channel, remove the spec-  
ified resistor and place a 10  
location (polarity does not matter). Refer to the following table:  
μF to 33μF capacitor in the specified pc board  
Channel  
Remove Resistors:  
R12, R13, R15  
R22, R23, R25  
R32, R33, R35  
R42, R43, R45  
Short Solder Points:  
X11 and X14  
1
2
3
4
Channel  
Remove Resistor from:  
Place 10μF to 33μF  
X21 and X24  
Capacitor in:  
X31 and X34  
1
2
3
4
R18  
R28  
R38  
R48  
X17  
X27  
X37  
X47  
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.  
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.  
1. Twist together the leads from one side of a 15 kΩ resistor and a  
0.1 μF capacitor:  
15 KΩ  
C = 26.5 F  
where:  
0.1 ΜF  
C = value of capacitor in μF  
F = corner frequency (-3 bB) for low-cut filter in Hz  
2. Solder the 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  
Resistor  
Insert Resistor-Capacitor  
Combination at Jumper  
1
2
3
4
R18  
R28  
R38  
R48  
X17  
X27  
X37  
X47  
9
 
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 Ω, Aux Level 150 Ω; terminations: Line 600 Ω, Mic 600 Ω, Aux Out 10 kΩ. 12 V phantom power off.  
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 inputs only)  
3dB down at 80 Hz, 6 dB/octave  
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 are not damaged by signals up to +10  
dBV; Auxiliary inputs by signals up to +36 dBV  
Gain (typical, controls full clockwise)  
Phantom Power  
12 Vdc open-circuit through 340Ω series resistance  
Operating Voltage  
SCM268: 100—120 Vac rated nominal, 50/60 Hz, 60 mA  
SCM268E: 220—240 Vac rated 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  
Input  
Output  
Line  
Mic  
Aux Out  
Low-impedance mic  
38 dB  
76 dB  
65 dB  
(150 Ω)  
Aux Level  
3 dB  
40 dB  
29 dB  
Inputs  
Input  
Impedance  
Designed for  
use with  
Actual  
(typical)  
Input  
Clipping Level  
1.20 Kg (2 lbs, 10 oz)  
Mic  
19-600 Ω  
1.2 kΩ  
–5 dBV  
Certifications  
Aux Level  
21 kΩ  
>28 dBV  
2 kΩ  
SCM268: UL & 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-  
Outputs  
Output  
Impedance  
Designed for  
use with  
Actual  
(typical)  
Output  
Clipping Level  
ments.  
N 108  
Mic  
Line  
low-Z inputs  
>600 Ω  
0.2 Ω  
72 Ω  
–21 dBV  
+18 dBV  
+7 dBV  
Replacement Parts  
Knob, Master (blue) ............................................... 95B8752  
Knob, Channel Gain (white)................................... 95A8752  
Line (Power) Cords:  
Aux Out  
>2 kΩ  
870 Ω  
Total Harmonic Distortion  
SCM268: 100-120 Vac (US/Canada)................ 95A8762  
SCM268E: 220-240 Vac (EU)........................... 95A8778  
SCM268E (Australia/New Zealand) .................. 95A9128  
Fuse, SCM268 (5x20 mm,  
<0.25% 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 Ω source; through 22  
250V, 80mA, slow-blow)........................................... 80A730  
Fuse, SCM268E (5x20 mm,  
Hz—22 kHz filter)  
124 dBV  
250V, 40mA, slow-blow)............................................80J258  
Hardware Kit ........................................................90AF8100  
Link Bars (Bracket) ................................................ 53A8443  
Single Mount Bracket............................................. 53A8484  
Dual Mount Bracket ............................................... 53B8484  
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  
Optional Accessories  
>80 dB at 1 kHz  
Line (Power) Cord, 230-240 Vac (UK) ................... 95A8713  
10  
 
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  
SHURE Incorporated http://www.shure.com  
미국 , 캐나다 , 중남미 , 카리브해 지역 :  
美国、加拿大、拉丁美洲、加勒比海地区:  
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.  
电话:847-600-2000 美国 传真:847-600-1212 国际 传真:847-600-6446  
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.  
전화 : 847-600-2000 미국 팩스 : 847-600-1212 국제 팩스 : 847-600-6446  
유럽 , 중동 , 아프리카 :  
欧洲、中东、非洲:  
Shure Europe GmbH,电话:49-7131-72140 传真:49-7131-721414  
Shure Europe GmbH, 전화 : 49-7131-72140 팩스 : 49-7131-721414  
아시아 , 태평양 :  
亚太地区:  
Shure Asia Limited,电话852-2893-4290 传真:852-2893-4055  
Shure Asia Limited, 전화 : 852-2893-4290 팩스 : 852-2893-4055  
 

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