Shure SCM410, SCM410E User Manual 2
Shure Brothers Incorporated
222 Hartrey Avenue
Evanston IL 60202-3696 U.S.A.
Model SCM410/SCM410E User Guide
SCM410/SCM410E
FOUR CHANNEL AUTOMATIC MICROPHONE MIXER
1999, Shure Brothers Incorporated
27A8690 (SG)
U.S. Patents 4,658,425; 5,297,210
Printed in U.S.A.
TABLE OF CONTENTS
DESCRIPTION 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FEATURES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATING PRINCIPLES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FRONT PANEL 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REAR PANEL 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIP SWITCH FUNCTIONS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SUPPLIED HARDWARE 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RACK MOUNTING 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TABLE-TOP MOUNTING 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIXED MOUNTING 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCM410 CONNECTIONS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LINKING MULTIPLE MIXERS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BASIC OPERATION 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LIMITER 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EQUALIZER FUNCTIONS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADVANCED FUNCTIONS 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LOGIC CONNECTION SPECIFICATIONS 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SUGGESTED LOGIC APPLICATIONS 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INTERNAL MODIFICATIONS 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
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.
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DESCRIPTION
The Shure Model SCM410/E is a four-channel automatic microphone mixer designed for use in sound reinforcement, audio recording, and broadcast applications. The SCM410 dramatically improves audio quality in any application where multiple microphones are required. Any low-impedance dynamic
or condenser microphone (including wireless) can be used
with the SCM410. Multiple SCM410 mixers can be linked to
other SCM410 mixers, as well as to Shure Models FP410,
SCM810, SCM800, and AMS8100 mixers.
FEATURES
• Fast, noise-free microphone selection, which automatically
adjusts to changes in background noise
•Automatic gain a djustment a s additional m icrophones a re a c-
tivated–NOMA (Number of Open Microphones Attenuated)
• Last Mic Lock-On circuit maintains ambient sound
• Fits in half-rack space
• Adjustable EQ for each channel
OPERATING PRINCIPLES
The operating concept behind the SCM410 Automatic Mixer is
Shure’s patented*
less automatic mixing by combining three separate functions:
IntelliMix
circuitry.
Intellimix
delivers seam-
• Noise Adaptive Threshold. Distinguishes between constant
background noise (such as air conditioning) and changing
sound (such as speech) for each input channel. It continuously
adjusts the activation threshold so that only speech levels
louder than the background noise activate a channel.
FRONT PANEL
Each input channel has a two-band equalizer and three logic
terminals. The equalizer reduces unwanted low-frequency audio pickup and makes different microphone types—lavaliers,
boundary and handheld—sound similar. The logic terminals
can be used to control external devices.
The SCM410 operates o n 100–120 Vac power and t he S CM410E
operates on 220–240 Vac power. Each mixer is supplied with a
power cord, rack-mounting hardware, and a link cable.
•Active balanced microphone-level XLR inputs and an active
balanced Mic/Line level XLR output
• Unbalanced auxiliary-level phono output
• Bi-color channel activation and clipping LEDs
• Peak-responding output limiter with LED indicator
• Peak-responding output level meter
•MaxBus. Controls the number of channels that may be acti-
vated for a single sound source. One talker activates only
one channel, even if multiple microphones “hear” that talker.
• Last Mic Lock-On. Keeps the most recently activated mi-
crophone open until another microphone is activated. Without Last Mic Lock-On, a long pause in conversation would
cause all microphones to turn off, which would sound as if
the audio signal had been lost. Last Mic Lock-On ensures
that background ambience is always present.
MODEL SCM410 FRONT PANEL
FIGURE 1
1.Microphone Channel Gain Controls 1 - 4: Allows adjustment of microphone gain.
2.Input LED 1 - 4: Lights green when channel is active; lights
red at 6 dB below clipping level.
3.Low-Cut Filter 1 - 4: Provides adjustable low-frequency rol-
loff (high pass), reducing presence of undesirable low-fre-
quency signals.
4.High-Frequency Shelv i n g F ilter 1 - 4: Provides level boost
or cut in mid/high-frequency region for reduced sibilance
from vocal microphones, or to compensate for off-axis col-
oration in lavalier microphones.
5.Output Level Meter: Six-segment LED meter indicates
peak output signal level in dBu (0 dBu = 0.775V). The red
LED illuminates when the output is 6 dB below clipping. The
last LED indicates limiter action.
6. MASTER Level Control: Controls overall output level.
7.POWER LED: Lights green when mixer is plugged into a
power source.
*U.S. Patents 4,658,425 and 5,297,210.
IntelliMix
3
is a registered trademark o f S hure Brothers I ncorporated.
REAR PANEL
MODEL SCM410 REAR PANEL
FIGURE 2
1.Power Connector: Unit is energized when the power cord
is plugged into a 100–120 Vac (SCM410) or 220–240 Vac
(SCM410E) power source. Can be internally modified.Refer
to the “Internal Modification” section. NOTE: There is no
power On/Off switch on this mixer.
2.DIP Switch: The 4-position DIP switch provides additional
functions. Refer to the “DIP Switch Functions”section.
3.Microphone Logic Connector: High density DB-15 male
connector provides connection to GATE OUT, MUTE IN,
and OVERRIDE IN logic terminals on each channel. Refer
to the “Advanced Functions” section. NOTE: THIS IS NOT
A VGA MONITOR PORT.
DIP SWITCH FUNCTIONS
The rear panel DIP switches, shown in Figure 3, provide the
functions listed in the table below.
(MIXER
REAR
PANEL)
DIP SWITCH FUNCTIONS
Last Mic
Lock-On
Switch
Number
Switch Up All mics off
Switch
Down
1 2 3 4
after hold time
ON* Line Level* OFF* OFF*
DIP SWITCHES
FIGURE 3
1 2 3 4
XLR
Output
Level
Mic Level ON ON
Limiter 12V
Phantom
Power
4.AUX OUT Phono Connector: Feeds consumer-level audio
equipment, such as a tape recorder, VCR, or video camera.
Not affected by MIC/LINE switch.
5.MIC/LINE XLR OUTPUT Connector: Can be set for micro-
phone or line-level output via a DIP switch.
6.LINK IN/OUT Connector: Permits multiple SCM410/E,
SCM810, SCM800, or AMS8100 mixers to be linked, creat-
ing additional inputs.
7.MIC LEVEL XLR INPUT Connectors: Active balanced microphone-level XLR inputs. For instructions on how to
modify the level of these inputs, refer to the “Internal Modifi-
cations” section.
Last Mic Lock-On: Keeps the most recently activated microphone turned on until another microphone is activated. When
defeated, microphones turn off after their default hold time.
XLR Output Level: Sets the level of the XLR output to line or
microphone level. Make sure the output level matches the input level of the device connected to the SCM410.
NOTE: The output level does not affect the auxiliary output
(AUX OUT) level.
Limiter: Activates the output limiter and sets it to a default
threshold of +16 dBu (see
Internal Modifications
for other
threshold settings).
12V Phantom Power: When this switch is in the ON position,
the SCM410 provides 12Vdc phantom power to each XLR microphone input. This function is particularly useful when using
condenser microphones, since most condenser microphones
require phantom power.
NOTE: Phantom power does not affect the operation of balanced dynamic microphones. They can be connected to the
SCM410 in combination with condenser microphones that use
phantom power. For instructions on how to disable phantom
power by channel, refer to the “Internal Modifications” section.
*Factory setting.
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INSTALLATION
SUPPLIED HARDWARE
4 rubber feet
1 rackmount bracket, long
1 rackmount bracket, short
2 straddle brackets
RACK MOUNTING
The SCM410 is supplied with hardware for mounting one or
two units to a 19-inch audio equipment rack. The hardware can
also be used to rack mount other Shure products, including the
SCM268, SCM262, DFR11EQ, and the DP11EQ.
Single Mixer (Half Rack) Installation
1.Attach the short and long rackmount brackets to the
SCM410/E with eight (8) of the supplied bracket screws, as
shown in Figure 4.
10 bracket screws, 6 mm (1/4 in.)
4 rackmount screws, 2.54 cm (1 in.)
4 plastic washers
4 wood screws, 1.25 cm (1/2 in.)
Dual Mixer (Full Rack) Installation
1.Place the two mixers side-by-side and connect them with
two (2) straddle brackets. The brackets should straddle the
recessed edges on the top and bottom of each mixer. See
Figure 6.
INSTALLING HALF–RACK MOUNTING BRACKETS
FIGURE 4
2. Place the mixer in an equipment rack and secure it with
the supplied rackmount screws and plastic washers. See
Figure 5.
RACK MOUNTING A SINGLE SCM410/E MIXER
FIGURE 5
INSTALLING STRADDLE BRACKETS
FIGURE 6
2.Fasten the straddle brackets using eight (8) bracket screws.
3.Attach the
combined mixers with eight (8) of the bracket screws. See
Figure 7.
INSTALLING FULL–RACK MOUNTING BRACKETS
4. Place the mixer in an equipment rack, using the supplied
rackmount screws and plastic washers. See Figure 8.
short
rackmount brackets to the outsides of the
FIGURE 7
RACK MOUNTING DUAL SCM410/E MIXERS
FIGURE 8
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TABLE-TOP MOUNTING
Adhere the four (4) supplied rubber feet to the bottom of the
mixer at each corner, as shown in Figure 9. This will keep it
from sliding and protect the table surface.
FIXED MOUNTING
Top Mount
1. Fasten the straddle brackets to the recessed edges of the
chassis, using four ( 4) b racket s crews, a s shown i n F igure 1 0.
ATTACHING RUBBER FEET FOR TABLE–TOP MOUNTING
FIGURE 9
Hanging Mount
1. Fasten the straddle brackets to the top of the mixer, as
shown in Figure 12.
INSTALLING STRADDLE BRACKETS FOR TOP MOUNTING
FIGURE 10
2.Fasten the straddle brackets to the top of the mounting surface, using the four (4) supplied w ood s crews. S ee F igure 11.
SECURING MIXER TO TOP MOUNTING SURFACE
FIGURE 11
INSTALLING STRADDLE BRACKETS FOR
HANG MOUNTING
FIGURE 12
2. Fasten the s traddle b rackets t o t he b ottom o f t he m ounting s urface, using the four (4) supplied wood screws. See Figure 13.
SECURING MIXER TO BOTTOM MOUNTING SURFACE
FIGURE 13
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