Shure SCM410E User manual

Model SCM410E User Guide
©2010 Shure Incorporated
27AS8881 (Rev. 3)
Printed in U.S.A.
SCM410E
FOUR CHANNEL AUTOMATIC MICROPHONE MIXER
四频道麦克风自动混音器
2
46
8
2
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2
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I
NTELLI
M
IX
-20 -100+6 +12 +18
LIMIT ER

2
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 MIXER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
LIMITER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
EQUALIZER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ADVANCED FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LOGIC CONNECTION SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SUGGESTED LOGIC APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
INTERNAL MODIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
! IMPORTANT SAFETY INSTRUCTIONS !
1. READ these instructions.
2. KEEP these instructions.
3. HEED all warnings.
4. FOLLOW all instructions.
5. DO NOT use this apparatus near water.
6. CLEAN ONLY with dry cloth.
7. 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.
12.
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.
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.
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.
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.
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 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.
WARNING: This product contains a chemical known to the State of California to cause cancer and birth
defects or other reproductive harm.

3
DESCRIPTION
The Shure Model SCM410/E is a four-channel automatic microphone
mixer 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, and SCM800, mixers.
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 on 100-120 Vac power and the SCM410E
operates on 220-240 Vac power. Each mixer is supplied with a power
cord, rack-mounting hardware, and a link cable.
FEATURES
• Fast, noise-free microphone selection, which automatically
adjusts to changes in background noise
• Automatic gain adjustment as additional microphones are ac-
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
• 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
OPERATING PRINCIPLES
The operating concept behind the SCM410 Automatic Mixer is
Shure's patented* IntelliMix® circuitry. Intellimix delivers seamless
automatic mixing by combining three separate functions:
• 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.
•
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 micro-
phone 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 back-
ground ambience is always present.
*U.S. Patents 4,658,425 and 5,297,210. IntelliMix is a
registered trademark of Shure Incorporated.
FRONT PANEL
Microphone Channel Gain Controls 1 - 4: Allows adjust-
ment of microphone gain.
Input LED 1 - 4: Lights green when channel is active; lights
red at 6 dB below clipping level.
Low-Cut Filter 1 - 4: Provides adjustable low-frequency
rolloff (high pass), reducing presence of undesirable
low-frequency signals.
High-Frequency Shelving Filter 1 - 4: Provides level
boost or cut in mid/high-frequency region for reduced sibi-
lance from vocal microphones, or to compensate for
off-axis coloration in lavalier microphones.
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.
MASTER Level Control: Controls overall output level.
POWER LED: Lights green when mixer is plugged into a
power source.
1
2 3 4 5 6 7
1
2
3
4
5
6
7

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REAR PANEL
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.
DIP Switch: The 4-position DIP switch provides additional
functions. Refer to the “DIP Switch Functions”section.
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.
AUX OUT Phono Connector: Feeds consumer-level audio
equipment, such as a tape recorder, VCR, or video camera.
Not affected by MIC/LINE switch.
MIC/LINE XLR OUTPUT Connector: Can be set for micro-
phone or line-level output via a DIP switch.
LINK IN/OUT Connector: Permits multiple SCM410/E,
FP410, SCM810, SCM800, or AMS8100 mixers to be
linked, creating additional inputs.
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.
DIP SWITCH FUNCTIONS
The rear panel DIP switches, shown in Figure 1, provide the functions
listed in the table below.
*Factory setting.
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 dynamic0 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.
2 3 4 5 6 7
1
1
2
3
4
5
6
7
Last Mic
Lock-On
XLR
Output
Level
Limiter 12V
Phantom
Power
Switch
Number
1234
Switch Up All mics off
after hold time
Mic Level ON ON
Switch
Down
ON* Line Level* OFF* OFF*
1234
DIP SWITCHES
FIGURE 1

5
INSTALLATION
SUPPLIED HARDWARE
• 4 rubber feet
• 1 rackmount bracket, long
• 1 rackmount bracket, short
• 2 straddle brackets
• 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.)
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.
2. Place the mixer in an equipment rack and secure it with the
supplied rackmount screws and plastic washers.
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.
2. Fasten the straddle brackets using eight (8) bracket screws.
3. Attach the short rackmount brackets to the outsides of the
combined mixers with eight (8) of the bracket screws.
4. Place the mixer in an equipment rack, using the supplied rack-
mount screws and plastic washers.
INSTALLING HALF-RACK MOUNTING BRACKETS
RACK MOUNTING A SINGLE SCM410/E MIXER
INSTALLING STRADDLE BRACKETS
INSTALLING FULL-RACK MOUNTING BRACKETS
RACK MOUNTING DUAL SCM410/E MIXERS

6
TABLE-TOP MOUNTING
Adhere the four (4) supplied rubber feet to the bottom of the mixer at
each corner. 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 chas-
sis, using four (4) bracket screws.
2. Fasten the straddle brackets to the top of the mounting surface,
using the four (4) supplied wood screws.
HANGING MOUNT
Note: The hardware provided is for attachment to wood. Other
surfaces require the use of appropriate hardware rated for 15
lbs. or more.
1. Fasten the straddle brackets to the top of the mixer.
2. Fasten the straddle brackets to the bottom of the mounting sur-
face, using the four (4) supplied wood screws.
ATTACHING RUBBER FEET FOR TABLE-TOP MOUNTING
INSTALLING STRADDLE BRACKETS FOR TOP MOUNTING
SECURING MIXER TO TOP MOUNTING SURFACE
INSTALLING STRADDLE BRACKETS FOR
HANG MOUNTING
SECURING MIXER TO BOTTOM MOUNTING SURFACE

7
SCM410 CONNECTIONS
1. Connect microphone signal sources to the Channel Input connec-
tors. Use conventional 2-conductor shielded audio cables.
2. If any condenser microphones are connected, set the +12V phantom
power DIP switch to ON.
3. Connect the SCM410 Mic/Line Level Output to the input of mixers,
EQs, amplifiers or recorders.
4. Connect the power cord to 100-120 Vac (SCM410) or 220-240 Vac
(SCM410E)
LINKING MULTIPLE MIXERS
If more than four inputs are needed, multiple Shure SCM410, FP410,
or SCM810 mixers can be linked by connecting the LINK OUT of the
first mixer to the LINK IN of the next mixer, and so on. See Figure 2.
Leave the LINK IN jack of the first mixer and the LINK OUT jack of the
last mixer unconnected.
When properly linked, the mixers will operate as a system. Automatic
mixing functions will be shared by all units. All input signals appear at
all linked mixer outputs. Each mixer's Master level control only controls
its own output. However, actual off-attenuation will increase as more
mixers are linked. This reduces excessive noise and reverberation
contributed by the increased number of microphones.
IMPORTANT: When using logic terminals on linked mixers,
connect the LOGIC GROUND terminals of each unit together.
NOTE: SCM410 link connections are unbalanced. To minimize
hum and noise, avoid using longer link cables. Use high
quality, shielded cable, and keep them away from sources of
magnetic or electrical noise, such as power transformers or
light dimmers. To minimize ground currents, make sure linked
mixers are connected to the same AC power mains.
SHURE
OR
LINKED SCM410 AND SCM810 MIXERS
FIGURE 2

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BASIC MIXER OPERATION
1. Adjust each channel level so that its Overload LED flickers only
during very loud speech or noise.
2. Adjust the Low-Cut and High-Frequency controls adjacent to each
Input Gain control so that the microphones sound similar.
3. Adjust the Master level control for the required output level, as
indicated by the output peak meter. The SCM410 is now ready for
use.
LIMITER
Output limiters prevent distortion during loud program peaks without
affecting normal program levels. This keeps the devices connected to
the SCM410 output from becoming overloaded. Increasing individual
or Master controls on the SCM410 increases average output and, in
turn, the amount of limiting.
The limiter may be turned on via the rear panel DIP switch. The default
limiter threshold is +16 dBu. As supplied, the limiter is defeated.
NOTE: Limiter thresholds can be changed from their factory
settings. Refer to the INTERNAL MODIFICATIONS section.
EQUALIZER FUNCTIONS
Low Cut Filter (High-Pass)
Low-cut filters are used to reduce unwanted low frequency sounds
such as footsteps, motorized traffic, and to control proximity effect. The
SCM410 has a one-pole, low-cut (high-pass) filter of 6 dB per octave.
The low-cut filter allows all frequencies above its cutoff point to pass
through unchanged. Frequencies below the cutoff are attenuated (see
Figure 3). The cutoff point is defined as the frequency where the signal
has dropped 3 dB relative to the flat, or bandpass, region. Below the
cutoff point, the filter exhibits increasingly more attenuation as the
frequency diminishes.
LOW-CUT FILTER EFFECTS
FIGURE 3
High-Frequency Shelving
The fixed-frequency equalizer produces a 6 dB boost or cut at 5 kHz
and above (see Figure 4). High-frequency shelving is extremely useful
for boosting flat frequency response and tempering sibilant vocal
microphones or enhancing the sound of off-axis lavalier microphones.
HIGH-FREQUENCY SHELVING EFFECTS
FIGURE 4
NOTE: The sensitivity of the Intellimix circuitry may allow some channel gating due to static discharge or electrical disturbance to the power or
signal lines. The unit will not be damaged; normal operation will resume after the disturbance ceases.
-10
-8
-6
-4
-2
0
+2
20 100 1,000 5,000
FULL CW
50%
ROTATION
FULL CCW
FREQUENCY
AMPLITUDE
200
-10
-8
-6
-4
-2
0
+2
+4
+6
+8
+10
1,000 10,000 20,000
FULL
CW
50%
ROTATE
FULL
CCW
FREQUENCY
AMPLITUDE

9
SPECIFICATIONS
Measurement Conditions (unless otherwise specified): Line voltage 120 Vac, 60 Hz (SCM410) or 230 Vac, 50 Hz (SCM410E); full gain;
1 kHz, one channel activated; source impedances: Mic 150 ; terminations: Line/Mic Aux 10 k
Frequency Response (at 1 kHz, channel controls centered)
50 Hz to 20 kHz 2 dB; –3 dB corner at 25 Hz
Voltage Gain (typical, controls full clockwise)
Inputs
Outputs
Total Harmonic Distortion
<0.1% at +4 dBu output level, 50 Hz to 20 kHz (through 22 Hz to 22
kHz filter; Input at 12 o' clock and Master at 12 o' clock, all other con-
trols full counterclockwise)
Hum and Noise (150 source; through 22 Hz to 22 kHz filter)
Equivalent Input Hum and Noise: –123 dBV max., –125 dBV typical
Output Hum and Noise (channel controls full counterclockwise):
Master full counterclockwise: –90 dBV
Master full clockwise: –70 dBV
Common Mode Rejection
>70 dB at 1 kHz
Polarity
All inputs to all outputs are non-inverting
Input Channel Activation
Attack Time: 4 ms
Hold Time: 0.4 s
Decay Time: 0.5 s
Off-Attenuation
13 dB
Overload and Shorting Protection
Shorting outputs, even for prolonged periods, causes no damage.
Microphone inputs are not damaged by signals up to +10 dBV (3V)
Equalization
Low-frequency: 6 dB/octave cut, adjustable corner from 25 to 320
Hz
High-frequency: 6 dB at 5 kHz, 8 dB at 10 kHz, shelving
Limiter
Type: Peak
Threshold: +16 dBu (at output)
Attack Time: 2 ms
Recovery Time: 300 ms
Indicator: Lights red when limiting occurs
Input LEDs
Green on channel activation, red at 6 dB below clipping
Phantom Power
12 Vdc open-circuit through 680 resistors
Operating Voltage
SCM410: 100-120 Vac rated nominal, 50/60 Hz,
100 mA (maximum)
SCM410E; 220-240 Vac rated niminal, 50/60 Hz,
50 mA (maximum)
Mains Inrush Current (230 Vac, SCM410E only)
0.7 A peak
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 219 mm W x 267 mm D (1-3/4x 8-5/8x 10-1/2in.)
Net Weight
1.75 kg (3.86 lbs)
Certifications
SCM410 : UL LISTED to UL 60065 and cUL LISTED to CAN/CSA-C22.2
No. 60065-3 Canada.
SCM410E: Conforms to applicable European Union Directives.
Low Voltage Directive, 2006/95/EC: Certified to EN
60065. Eligible to bear CE marking. Conforms to European
EMC Directive 2004/108/EC. Meets Harmonized Standards
EN55103-1:1996 and EN55103-2:1996 for residential (E1)
and light industrial (E2) environments.
Authorized European Representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
Wannenacker Str. 28
D-74078 Heilbronn, Germany
Phone: [phone]
Fax: [phone]
Email: [email protected]
Electromagnetic Compatibility (EMC) Statement
The SCM410E mixer is intended for use in E1 (residential) and E2
(light industrial) environments, as defined in European EMC stan-
dard EN 55103. It meets the applicable tests and performance cri-
teria found in the standard for these environments. EMC
conformance is based on the use of recommended and supplied
cables.
NOTE: Under certain circumstances, the SCM410E may be exposed to
outside electromagnetic interference levels beyond what is typical in the
intended environment. Should this occur, additional measures may be
required to reduce interference to acceptable levels. The following table
identifies possible sources of unwanted interference.
Output
Input Line Mic Aux
Low-impedance mic (150 ) 80 dB 40 dB 68 dB
Impedance
Input Designed for
use with
Actual
(typical)
Input Clipping
Level
Mic 19-600 1.4 k–14 dBV
Impedance
Output Designed for
use with
Actual
(typical)
Output Clipping
Level
Line 5k 300 +24 dBV
Mic 600 3 –18 dBV
Aux 10k 1.5 k +14 dBV
Decreased
Signal-to-Noise
Ratio
Erratic LED
and/or Channel
Operation
Signal
Distortion
High RF Field
(generated by
nearby radio
transmitter)
XXX
Electrostatic
Discharge XX
Magnetic Fields
(close proximity to
mains power lines
or CRTs)
XX
Mains Power Line
Interruptions/Dips
(poor power grid
qualtiy/storms)
XX
Mains Surges and
Line Transients
(nearby lightning
strikes/mains
arcs)
XX
N108

10
Replacement Parts
Knob, Master (white) .................................................... 95A8238
Knob, Channel Gain (blue)........................................... 95B8238
Line (Power) Cord (SCM410)....................................... 95B8389
Line (Power) Cord (SCM410E) .................................... 95B8778
Line (Power) Cord Australia/New Zeland
(SCM410E/AZ)............................................................. 95A9128
Link Cable .................................................................... 95A8889
Fuse, SCM410
(5 x 20 mm, T 125mA L, 250V, time delay).................. 80AA730
Fuse, SCM410E
(5 x 20 mm, T 50mA L, 250V, time lag)........................... 80J380
Long Rack Mount Bracket............................................ 53A8484
Short Rack Mount Bracket ........................................... 53E8484
Straddle Bracket........................................................... 53B8443
Bagged Hardware Kit................................................ 90AW8100
Optional Accessories
Line (Power) Cord, 230-240 Vac (UK) ......................... 95A8713
External 50 dB Line Pad .................................................. A15LA
Service Statement
For additional technical assistance, phone Shure at
1-847-600-8440. In Europe, phone [phone].

11
ADVANCED FUNCTIONS
LOGIC CONNECTION SPECIFICATIONS
The SCM410 logic functions expand the range of installation and control
options. Logic can be used for everything from simple cough switches to
elaborate computer-controlled room systems. (Shure's AMS Update pub-
lication contains additional applications of advanced logic. This publica-
tion is available by contacting the Shure Applications Department.) The
following logic functions are available for each channel:
GATE OUT: Follows channel gating and goes to logic “low” (sinks cur-
rent) when microphone is gated on. 500 mA of current sinking ability is
provided (see Figure 5A).
MUTE IN: Applying logic “low” (from GATE OUT or a switch closure to logic
ground) gates channel off (see Figure 5B). Channel output drops to -
 .
OVERRIDE IN: Applying logic “low” (from GATE OUT or a switch closure
to logic ground) forces channel on (see
Figure 5B ). When both Mute and
Override are activated, Mute takes precedence (see Internal Modifica-
tions for Override precedence).
LOGIC GROUND: Logic ground is distinct from audio ground. Make all
logic ground connections to this pin, including power supply ground of ex-
ternal logic circuitry. To avoid switching clicks, do not connect logic
ground to audio, chassis or rack grounds.
Logic controls are accessed through the high density DB-15 multi-pin
connector on the rear panel (Figure 6). Pin connections are shown in the
following table.
LOGIC CONNECTIONS
CAUTION: Use of Advanced Functions is recommended only for qualified audio technicians.
55K
10K
+5 V +5 V
AB
LOGIC EQUIVALENT CIRCUIT DIAGRAM
FIGURE 5
FROM
SCM410
CIRCUIT
GATE
OUT
LOGIC
GROUND
MUTE IN
OR OVER-
RIDE IN
TO
SCM410
CIRCUIT
LOGIC CONNECTOR
FIGURE 6
Pin
No.
Logic Function Logic Function Pin
No.
1 OVERRIDE IN 1 GATE OUT 1 6
2 OVERRIDE IN 2 GATE OUT 2 7
3 OVERRIDE IN 3 GATE OUT 3 8
4 GATE OUT 4 GATE OUT 4 4
5 LOGIC GROUND OVERRIDE IN 1 1
6 GATE OUT 1 OVERRIDE IN 2 2
7 GATE OUT 2 OVERRIDE IN 3 3
8 GATE OUT 3 OVERRIDE IN 4 14
9 NO CONNECTION MUTE IN 1 11
10 MUTE IN 4 MUTE IN 2 12
11 MUTE IN 1 MUTE IN 3 13
12 MUTE IN 2 MUTE IN 4 10
13 MUTE IN 3 LOGIC GROUND 5
14 OVERRIDE IN 4 NO CONNECTION 15
15 NO CONNECTION NO CONNECTION 9

12
SUGGESTED LOGIC APPLICATIONS
This section contains suggestions on the uses of the SCM410's logic ca-
pabilities. Note that uses of these functions are not limited to the listed ap-
plications. The user is limited only by imagination and creativity. For
additional suggestions and solutions to installation problems, contact the
Shure Applications Department.
COUGH BUTTON
The talker can turn off his or her microphone during coughing or private
conversations by installing an SPST pushbutton switch between the
MUTE IN and Logic Ground pins for each channel to be modified (see Fig-
ure 7). When a channel is muted, no audio is passed. (See Dead Zone on
MUTE IN Defeat paragraph in the Internal Modifications section for more
information on MUTE IN logic.)
CHAIRPERSON-CONTROLLED MUTING
The chairperson can, by activating a switch, silence all other microphones
and be heard without interruption. For operation in this mode, connect all
the MUTE IN pins together except that of the chairperson's channel, and
wire an SPST pushbutton or toggle switch between those MUTE IN and
Logic Ground pins (see Figure 8).
An alternative to a switch is to connect the chairperson's GATE OUT to
the MUTE IN of other channels. When the chairperson's microphone ac-
tivates, all other microphones mute.
REMOTE CHANNEL-ON INDICATORS
Remote indicators can be used to indicate when a talker's microphone is
on. Connect the LEDs and a 5-volt supply to the GATE OUT pins (See
Figure 9). To avoid switching clicks in the audio output, do not ground the
power supply negative terminal in the audio system or rack ground.
IMPORTANT: If a single cable is used for the microphone audio
signal and the LED dc power, separate shielded pairs must be
used. Failure to carry the dc power on a shielded pair may result in
audible clicking due to capacitive coupling between the dc power
lines and microphone lines.
DISABLING THE GATING FUNCTION (BYPASS)
To keep certain microphones on at all times, wire the desired microphone
channel's OVERRIDE IN pins together to the Logic Ground pin. The se-
lected channels now function as they would in a non-automatic mixer (see
Figure 10). To perform this modification internally on the mixer, refer to
the Shorting Override In to Logic Ground Internally paragraph in the Inter-
nal Modifications section.
M1
M3
M2
COUGH BUTTONS
FIGURE 7
LOGIC
GROUND
M2 M3 M4
CHAIRPERSON-CONTROLLED MUTING
FIGURE 8
LOGIC
GROUND
+
G1 G3
470 ,
1/4 W
470
1/4 W
470
1/4 W
G2
7
7
7
,,
REMOTE CHANNEL-ON INDICATORS
FIGURE 9
LOGIC
GROUND
5 V POWER
SUPPLY
O2O1 O3
GATING BYPASS
FIGURE 10
LOGIC
GROUND

13
INHIBITING GATING FOR UNWANTED SOUNDS
MaxBus attempts to activate only one microphone per sound source.
Muting a microphone channel prevents its audio from appearing at the
mixer's output. However, the muted microphone still communicates
with other mic channels via MaxBus. A sound source picked up by a
muted microphone will not activate other microphones.
Sound sources that may cause unwanted microphone channel activa-
tion include:
• Heating, ventilation, or air conditioning systems
• A noisy fax machine or printer
• A squeaky door
• A paging system loudspeaker
• An audio teleconferencing return signal loudspeaker
The SCM410 can prevent these and similar sounds from activating
microphones as follows:
1. Place one microphone near the unwanted sound source. Con-
nect that microphone's signal to a channel input, -or- connect the
unwanted sound source directly into a channel input.
2. Mute that channel using the logic terminal (see Figure 11). To
perform this modification internally on the mixer, refer to the
Shorting Mute In to Logic Ground Internally paragraph in the
Internal Modifications section.
3. Adjust the channel gain control just past the level where
unwanted sounds do not activate other microphones in the
system. If the channel gain is set too high, the other micro-
phones may not be activated by the desired sounds. If set too
low, unwanted sounds will continue to activate other micro-
phones.
LOUDSPEAKER MUTING
Some applications require a loudspeaker to be placed near each talker to
provide audio reinforcement, or to permit telephone conversation or con-
ference monitoring. Each loudspeaker can cause feedback unless it is au-
tomatically switched off when the talker near it speaks. To provide this
function, connect the GATE OUT terminal of each channel to a separate
loudspeaker muting relay (See Figure 12). Recommended relays are Ra-
dio Shack 275-248, Omron G2R-14-DC12 (Digi-Key number Z745-ND),
Potter & Brumfield R10-E1Y2-V185 (Newark number 45F106), or equiv-
alent.
NOTE:A diode across each relay coil is required to suppress
inductive voltage spikes which may damage the SCM410.
An existing sound system using 24-volt relays can be used with the
SCM410 without modification if the relay coil current draw is under 500 mA.
“FILIBUSTER” MODE
Normally, when several people talk, each microphone gates on so that no
speech is missed. In “filibuster” mode, a microphone remains gated on
until the talker pauses long enough for that microphone to gate off. No
other microphone can gate on until that microphone gates off. This pre-
vents talkers from being interrupted.
To establish filibuster mode, refer to Figure 13 and proceed as follows:
1. Perform the Mute to Inhibit modification as presented in the
Internal Modifications section.
2. Connect all the MUTE IN pins together on the modified channels.
3. Connect all the GATE OUT pins together on the modified channels.
4. Connect the GATE OUT pin of one modified channel to the
MUTE IN pin of another modified channel .
5. Turn the Last Mic Lock-On switch to OFF.
NOTE: To prevent high-frequency oscillation, do not wire a GATE
OUT pin to a MUTE IN pin on the same channel unless the Mute to
Inhibit modification has been made.
M1
INHIBITING GATING FOR UNWANTED SOUNDS
FIGURE 11
LOGIC
GROUND
+
–
G3G1
DD
D = 1N4148
LOUDSPEAKER MUTING
FIGURE 12
LOGIC
GROUND
12 V
POWER
SUPPLY
G1
M1
G3
M3M2
G2
“FILIBUSTER” MODE
FIGURE 13
LOGIC
GROUND

14
INHIBIT FUNCTION
For information on the inhibit function, refer to the Internal
Modifications section.
REMOTE VOLUME CONTROL
The level of the Aux or Master output can be controlled from an
external VCA (Voltage Controlled Amplifier) such as the RU-VCA1
from Radio Design Labs (Tel. [phone], or www.rdlnet.com). To
connect a VCA to the SCM410, proceed as follows:
1. Connect the SCM410 Line output to the VCA line input.
2. Connect the VCA line output to the external device.
3. For remote Master level control, set the SCM410 Master control
to 5.
DIODE ISOLATION OF LOGIC CONTROLS
Two or more control functions that use the same logic pins can be
isolated with diodes, as shown in Figure 14. With this modification, a
channel can be muted by an overall group mute switch, or by its own
cough button.
EXTERNAL LOGIC DEVICES
SCM410 logic levels are directly compatible with TTL and 5V CMOS
logic families. Mixer logic may be used with 15V CMOS logic if a
pull-up resistor is used with each GATE output. See Figure 15.
NOTE: For information on logic gate use, refer to the TTL
Cookbook and CMOS Cookbook, both by D. Lancaster, Howard
Sams Publishing Co.
DIGITAL CONTROLS OR MICROCOMPUTERS
The SCM410 logic pins can interface with custom-designed digital
control circuitry or microcomputers for unlimited possibilities of system
control functions.
M1
M3
DD
DIODE ISOLATION OF LOGIC TERMINALS
FIGURE 14
LOGIC
GROUND
GROUP
MUTE
COUGH
BUTTONS
D = 1N4148 OR
EQUIVALENT
+
–
5.1 K
G1
M1
O1
15V CMOS
FIGURE 15
LOGIC
GROUND
CMOS
GATES
15 V
POWER

15
INTERNAL MODIFICATIONS
• Only make changes to jumpers (X) and resistors (R). The cir-
cuit board contains holes where resistors are to be added.
• For Channel modifications, the first character of the reference
designator indicates the channel number,(i.e., R1027 refers to
a Channel 1 resistor, X2001 refers to a Channel 2 jumper,
etc.). Modifications affecting the Master section are preceded
by a “9" (i.e., X9001).
• All Channel modifications in this section use Channel 1 as an
example.
DISASSEMBLING THE SCM410/SCM410E
To access the printed circuit board for internal modifications, proceed
as follows:
1. Remove the power cord from the ac power source.
2. Remove the knobs, retainer nuts, and washers from the front
panel, as shown in Figure 16
3. Remove the four screws at each corner of the rear panel.
4. Remove the two screws at each bottom corner of the front panel.
5. Slide the back panel and printed circuit board out from the rear of
the chassis.
CAUTION: When reassembling the SCM410, DO NOT OVERTIGHTEN
the knob retainer nuts.Damage to the internal components will result if too
much force is used.
MODIFYING THE SCM410 FOR 220-240 VAC, 50/60 HZ OPERATION
As supplied, the SCM410 uses 100-120 Vac, 50/60 Hz power. To
modify if for use with 220-240 Vac, 50/60 Hz power, proceed as
follows:
1. Disassemble the SCM410 according to the procedures in the
Disassembling the SCM410/SCM410E paragraph.
2. Locate Voltage Selector switch SW9001 adjacent to power trans-
former T9000.
3. Using a screwdriver, turn the center rotor to the 230 position.
4. Locate Fuse F9000 and replace it with a T 50 mA L, 250 V, time
lag fuse for 220-240 Vac operation.
5. Replace the power cord with a cord rated for 220-240Vac operation.
MODIFYING THE SCM410E FOR 100-120 VAC, 50/60 HZ OPERATION
As supplied, the SCM410E uses 220-240 Vac, 50/60 Hz power. To modify
it for use with 100-120 Vac, 50/60 Hz power, proceed as follows:
1. Disassemble the SCM410E according to the procedures in
the Disassembling the SCM410/SCM410E paragraph.
2. Locate Voltage Selector switch SW9001 adjacent to power trans-
former T9000.
3. Using a screwdriver, turn the center rotor to the 115 position.
4. Locate Fuse F9000 and replace it with a T 125 mA L, 250 Vac,
time delay fuse for 100-120 Vac operation.
5. Replace the power cord with a cord rated for 100-120 Vac
operation.
INSERTING A 12 DB MIC PREAMPLIFIER PAD
A microphone preamplifier channel gain can be reduced by 12 dB. This
may be desirable with high-output microphones.
Procedure:
1. Short jumper X1000.
2. Remove resistor R1006.
DISABLING PHANTOM POWER BY CHANNEL
To disable phantom power for a given microphone input channel, remove
the resistor specified in the following table
WARNING: Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified
service personnel.
KNOB ASSEMBLY AND DISASSEMBLY
FIGURE 16
Channel Remove Resistor
1 R1005
2 R2005
3 R3005
4 R4005

16
INSERTING AN INPUT LINE PAD
To insert a 40 dB line pad for a given microphone input, remove the
resistors specified in the following table.
DISABLING THE MASTER LEVEL CONTROL
The Master gain control can be disabled to prevent tampering. Refer
to the following table for gain levels and resistor values.
Procedure:
1. Remove resistor R9203.
2. Install new resistor at jumper R9173.
CHANGING THE LIMITER THRESHOLD
To change the limiter threshold from the preset value of +16 dBu,
modify the circuitry according to the following table.
CHANGING HOLD TIME
To change the hold time from the preset value of 0.4 seconds, modify
the circuitry according to the following table.
LOCAL AUX OPERATION
This modification removes the auxilliary audio from the SCM410
outputs. Auxilliary audio originates from the aux inputs of the Shure
SCM810, SCM800, and AMS8100 mixers when linked to the SCM410.
Procedure:
1. Remove resistor R9187.
Channel Remove Resistor
1 R1005, R1006
2 R2005, R2006
3 R3005, R3006
4 R4005, R4006
Master Section Gain Resistance
-6 dB 5.1 k
0 10 k
6 dB 20 k
CHANGE LIMITER THRESHOLD
Limiter
Threshold (dBu)
Limiter
DIP switch
X9003 R9149 R9142
0 On -- Remove 20k
+4 On Short -- --
+8 Off Short -- --
+12 On -- Remove 110k
+16
(default)
n------
+20 On -- Remove 300k
+24 On -- Remove 400k
CHANGE HOLD TIME
Hold Time
(seconds)
X9000 R9073 R9079
0.3 ----2M
0.4 (default) -- -- --
1.0 Short -- --
1.5 Short 470k --

17
MUTE IN PRECEDENCE TO OVERRIDE IN PRECEDENCE
When both MUTE IN and OVERRIDE IN logic are grounded, the
Override mode will take precedence (as supplied, the MUTE IN takes
precedence over OVERRIDE IN).
Procedure:
1. Short jumper X1005.
2. Remove resistor R1087.
DEAD ZONE ON MUTE IN DEFEAT
As supplied, MUTE IN is intended for use as a momentary cough
button or privacy function (mute when necessary). However, if the
MUTE IN is intended to be used so that the talker must unmute
microphones to enable speech pickup (unmute when needed), this
modification is needed. This removes the muted channel from the
MaxBus which eliminates “dead zones.” A dead zone is an area in
which a microphone picks up a talker through a muted microphone and
other microphones do not activate for that talker.
Procedure:
1. Short jumper X1002.
CHANGING MUTE IN TO INHIBIT
As supplied, a channel will mute when its MUTE IN terminal is
grounded. The mute function for each channel can be modified so that
a logic “low” at the MUTE IN terminal prevents that channel from gating
on if it is off, but allows it to remain on if it is already on. Use this
modification to enable Filibuster Mode.
IMPORTANT: To prevent high-frequency oscillation, never connect the
GATE OUT to the MUTE IN of the same channel unless the “Inhibit”
modification has been made.
Procedure:
1. Short jumper X1007.
CHANGING OVERRIDE IN TO MUTE IN (FILIBUSTER MODE)
This modification should only be performed with the Change MUTE IN to
Inhibit modification described above. This is only necessary if the Mute
function is desired along with Filibuster Mode.
Procedure:
1. Short jumper X1006.
2. Remove resistors R1087 and R1082.
CHANGING THE OFF-ATTENUATION LEVEL
This procedure changes the off-attenuation level from -13 dB (as sup-
plied). Refer to the following table for attenuation levels and resistor
values.
NOTE: As more Input channels are added to the system, the
off-attenuation increases slightly.
Procedure:
1. Remove resistor R9178.
2. Install new resistor at jumper points R9177.
GROUP GATING
With this modification, several channels can be grouped together so that
all of them activate whenever one of them activates. This is useful for
miking choirs.
Procedure:
1. Locate pad PD1000.
2. Solder a wire from PD1000 to the other channels in the group.
For example, to gate channels 1-3 as a group, solder a wire
connecting PD1000, PD2000, and PD3000.
Off-Attenuation Level Resistor Value
10 dB 18 k
13 dB
(default)
30 k
20 dB 75 k
30 dB 250 k
dB open circuit

18
SHORTING OVERRIDE IN TO LOGIC GROUND INTERNALLY
This modification is equivalent to shorting one of the channel OVERRIDE
IN to the LOGIC GROUND pin via the high density DB-15 logic connector.
With this modification, a channel is always on.
Procedure:
1. Short jumper X1003.
SHORTING MUTE IN TO LOGIC GROUND INTERNALLY
This modification is equivalent to shorting a channel MUTE IN to the
LOGIC GROUND pin via the high density DB-15 logic connector. With this
modification, a channel is always muted.
Procedure:
1. Short jumper X1004.
DISABLING AUTOMATIC MIXING FUNCTION BY CHANNEL
This modification removes a given channel from the IntelliMix automatic
mixing circuitry, so that a source such as music can be played through a
channel of the SCM410 without affecting the automatic mixing of the un-
modified channels.
Procedure:
1. If necessary, modify the channel input to accept line level
signals. Refer to the Inserting an Input Line Pad paragraph.
2. Modify the channel's Override In to On. Refer to the Shorting
Override In to Logic Ground Internally paragraph.
3. Short jumper X1001 to remove the channel from the MaxBus.
4. Remove R1064 to remove the channel from the Last Mic
Lock-On Bus.
MANUAL MODE ENABLE
This modification defeats the automatic mixing functionality of the
SCM410, so that it operates as a standard 4 x 1 mixer.
Procedure:
1. Short jumper X9001.

1
SCM410E
目录
说明. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
特性 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
工作原理 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
前面板 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
后面板 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DIP 开关功能. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
安装. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
附带硬件 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
机架安装 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
桌面安装 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
固定安装 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SCM410 连接 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
连接多个混音器 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
混音器基本操作. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
限幅器 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
均衡器功能 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
规格. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
高级功能 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
逻辑连接规格. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
建议的逻辑应用. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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ₜ尐⦷槯扠㻃䤓⦿㡈∎䞷㦻幍⮖ᇭ5.
♹厌䞷㄁を㝵㕼幍⮖ᇭ6.
ₜ尐⫄⫭↊⇤抩歝♲ᇭ挄㈹Ⓟ抯⟕䤓広㢝扪嫛⸘孔ᇭ7.
ₜ尐⺕㦻幍⮖⸘孔⦷↊⇤䍼䄟棓扠᧨Ⱁ㟲䍼⣷ᇬ庒䂸⣷ᇬ䋺䌘㒥␅8.
⸒♾厌ℶ䞮䍼摞䤓孔函᧤▔㕻┮䘖㟍⮶⣷᧥ᇭ
ₜ尐䫃⧞サ㨐㊶㒥㘴⦿伊⨚㙡⯃䤓⸘⏷┮厌ᇭ㨐㊶㙡⯃サ㦘₳₹9.
㙡䓖᧨␅₼₏₹戒♵₏₹⹌ᇭ㘴⦿伊⨚㙡⯃サ㦘₳₹㙡䓖✛䶻ₘ
₹㘴⦿㙡厩ᇭ戒⹌䤓㙡䓖㒥䶻ₘ₹㙡厩㢾⃉⸘⏷䥽䤓幍函䤓ᇭⰑ
㨫㙟∪䤓㙡⯃㡯㽤㙡⏴㌷䤓㙡ㄶ᧨庆⚠䟄ぴ✷幱Ⱁ⇤㦃㗱扖㢅䤓
㙡ㄶᇭ
≬㔳䟄䄟兎棁㷱嬺厩悸悞㒥嬺⯈侶᧨⺳␅㢾⦷㙡⯃ᇬ㡈≎㙡ㄶ✛㧉10.
愺䟄䄟兎ㆤ⒉⮓ᇭ
♹厌∎䞷Ⓟ抯⟕㖖⸩䤓扭㘴ↅ棓ↅᇭ11.
12.
⦷榆䟄⮸㺣㒥栎㢅梃ₜ∎䞷㢅᧨ㄣ㕣⒉幍⮖䤓㙡⯃ᇭ13.
㓏㦘冃≽⧖ㄣ䟀⚗㫋䤓冃≽ⅉ⛧㓶嫛ᇭ⦷幍⮖⥯ⅴₚ㍔⑄嬺㗮⧞14.
㢅᧨ㄣ扪嫛冃≽᧶䟄䄟兎㒥㙡⯃㗮⧞ᇬ䁁⇢㾋䄔Ⓙ幍⮖㒥㆑䓸扪
⏴幍⮖᧨幍⮖㥃槁⦷楷㻃㒥䇽䄎䘾⬒₼力㡯㽤㷲デぴ⇫᧨㒥㛣囌
Ⓙ⦿ₙᇭ
ₜ尐⺕㦻幍⮖㥃槁⦷♾厌䆃㻃✛䄔㻃䤓⦿㡈ᇭₜ尐⺕孔㦘䁁⇢䤓15.
⹈⣷᧤Ⱁ啀䞅䷘᧥㟍⦷㦻幍⮖ₙᇭ
䟄䄟㙡⯃㒥䟄⣷懻㘴⯃ㄣ≬㖐⦷椞㢅♾䞷䕅㊐ᇭ16.
㦻孔函䤓䴉㺣⣹⭿⇝ℝG%$ᇭ17.
ㄣ⺕䶵⚗,伊㪖⑕䤓幍⮖扭㘴Ⓙサ㦘㘴⦿≬㔳孔函䤓⃊䟄䄟㙡18.
ㄶᇭ
⃉棜⇝怆䋺㒥䟄⒊☀棸᧨ₜ尐⺕㦻幍⮖㥃槁⦷楷₼㒥䇽䄎䘾⬒ₚᇭ19.
ₜ尐⢦峵㟈孬㦻䞱❐ᇭ抨㲲⋩㦒⺝咃ⅉ愺⍆⹂✛㒥䞱❐㟔椫ᇭ20.
摜尐⸘⏷ℚ欈
扨₹䶵⚆嫷䯉㦻幍⮖₼ⷧ⦷♾厌⺋咃屵䟄䤓☀棸䟄☚ᇭ
扨₹䶵⚆嫷䯉㦻幍⮖棓サ䤓広㢝󱂖₼␆㦘摜尐䤓㝜⇫✛冃㔳広㢝ᇭ
巵⛙᧶㷳幍⮖₼䤓䟄☚␆㦘咃✌☀棸ᇭ幍⮖␔捷㼰㦘䞷㓆♾冃≽䤓捷ↅᇭ㓏㦘冃≽⧖ㄣ䟀⚗㫋䤓冃≽ⅉ⛧㓶嫛ᇭⰑ㨫㟈♧ℕ☑㡈幍函䤓ぴ⇫䟄☚᧨⒨⸘
⏷⚗㫋幐󱂖ₜ␜抑䞷ᇭ
♹厌∎䞷Ⓟ抯⟕㖖⸩䤓㒥椞幍⮖➽⒉䤓㓚㘷懵ᇬ㞾ㄶᇬₘ屡㩅ᇬ
㓧㩅㒥㞾㜠♿ᇭⰑ㨫∎䞷㓚㘷懵᧨⦷䲊┷孔㦘幍⮖䤓㓚㘷懵㢅
ㄣ㽷㎞⸘⏷᧨挎⏜幍⮖劊囌ᇭ

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说明
Shure 型号 SCM410E 是一台 8 频道麦克风自动混音器，适用于扩
声、录音和广播等应用。SCM410E 可在需要多个麦克风的应用场合
大幅度提高音响质量。可以将低阻抗动态麦克风或电容麦克风 （包括
无线式）与 SCM410E 一起使用。可以将多个 SCM410E 混音器连接
到其它 SCM410E 混音器和 Shure 型号 FP410、SCM810、SCM800
和AMS8100 混音器。
每个输入频道都有一个两波段均衡器和三个逻辑接线端。均衡器可
以减少不必要的低频拾音，以使领夹式、界面式和手持式等不同麦克
风类型声音统一。可以使用逻辑接线端控制外部设备。
SCM410 使用 100-120 伏交流电源工作； SCM410E 使用 220 伏交
流电源工作。 每个混音器都配有电源线、托架安装硬件和一条连接缆线。
特性
• 能够自动调节以适应背景噪声变化的快速无噪声麦克风选择
• 在启用其它麦克风的 NOMA （打开麦克风衰减数量）时自动
进行增益调节
• 可保持环境音的最后麦克风锁定电路
• 可装入半高机架空间
• 用于每个频道的可调节均衡器
• 有源平衡麦克风电平 XLR 输入和有源平衡麦克风 /
线路电平 XLR 输出
• 非平衡辅助电平 Phono 输出
• 频道活动和削波双色指示灯
• 带有发光二极管指示灯的峰值响应输出限幅器
• 峰值响应输出电平表
工作原理
SCM410E 自动混音器的工作原理源自 Shure 的专利技术
*IntelliMix 电路。Intellimix 通过结合以下三项独立功能提供了平滑的自
动混音：
• 噪声适应阈值。 为每个输入频道区分恒定背景噪声（例如空调
等）和变化音 （例如语音等）。 它能够持续调整启动阈值，从
而只有在语音电平高于背景噪声时才启用频道。
• MaxBus 。 可以控制为单个声源启用的频道数。 即使多个麦克
风“听到了”讲话者的声音，一个讲话者也只能启用一个频道。
• 最后麦克风锁定。 可让最后启用的麦克风保持打开，直到启用
另一个麦克风为止。
如果不使用 “最后麦克风锁定功能”，谈
话过程中的长时间停顿会导致所有麦克风关闭，就如同丢失了
所有音频信号。
“最后麦克风锁定功能”可以确保背景环境始
终存在。
*美国专利号 4,658,425 和5,297,210。IntelliMix 是Shure
Incorporated 的注册商标。
前面板
麦克风频道增益控制器 1-4：允许调节麦克风增益。
输入指示灯 1-4：启用频道时绿灯亮起，低于削波电平 6 分
贝时红灯亮起。
低切滤波器 1-4：用于提供可调节的低频释放 （高通） ，从
而减少不需要的低频信号。
高频栅形均衡滤波器 1-4：用于在中 /高频区域提供电平升
高或降低以减少声乐麦克风的咝咝声，或用于补偿领夹式麦
克风的离轴音调。
输出电平表： 六段式指示灯表用于指示以 dBu (0 dBu =
0.775V) 为单位的峰值输出信号电平。在输出低于削波 6 dB
的情况下，红色指示灯点亮。最后一个指示灯用于显示限幅
器操作。
主电平控制器：用于控制整体输出电平。
电源指示灯：在将混音器电源插头插入电源插座时呈绿色
点亮。
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