Shure SCM810 User's Guide

Á

Á

Model SCM810/SCM810E

MASTER

Á

Ć30 Ć12 0 +12

ÁÁ

+20

64

Á

2

8

100

7

ÁÁÁÁ

828

ÁÁÁÁ

64

100

54

ÁÁ

82

ÁÁÁ

64

Á

100

2

ÁÁÁ

64

0

10

1

64

Á

2

82

100

3

ÁÁÁÁ

64

100

82

ÁÁÁ

64

Á

2

100

6

ÁÁÁ

64

8

82

AUX

INPUT

100

8

Á

SCM810/SCM810E

EIGHT-CHANNEL MICROPHONE MIXER

ÁÁÁÁ

LIMITER

Á

Á

User Guide

SCM810

POWER

PHONES

2002, Shure Incorporated
27C8504 (BJ)

Printed in U.S.A.

TABLE OF CONTENTS

DESCRIPTION 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SYSTEM FEATURES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATING PRINCIPLES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FRONT PANEL FEATURES 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

REAR PANEL FEATURES 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DIP SWITCHES 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION AND SYSTEM SETUP 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RACK MOUNTING THE MIXER 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SCM810/E CONNECTIONS 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OUTPUT LIMITER SETTINGS 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EQUALIZER FUNCTIONS 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

USING AN EQUALIZER/FEEDBACK CONTROLLER WITH AN AUTOMATIC MIXER 7. .

BASIC MIXER OPERATION 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NETWORKING MULTIPLE MIXERS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GLOBAL/LOCAL FUNCTIONS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LINK CABLES 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SPECIFICATIONS 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ADVANCED FUNCTIONS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LOGIC CONNECTION SPECIFICATIONS 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SUGGESTED LOGIC APPLICATIONS 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VOLTAGE SELECTION 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTERNAL MODIFICATIONS 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

W ARNING: 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.

2

DESCRIPTION

The Shure Model SCM810/E is an eight-channel automatic mi­crophone mixer designed for use in sound reinforcement, audio
recording, and broadcast applications. The SCM810 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
SCM810/E. Multiple SCM810 mixers can be linked to other
SCM810/E mixers, as well as to Shure Models FP410, SCM410,
SCM800, and AMS8100 mixers.

SYSTEM FEATURES

 Fast-acting, noise-free microphone selection that automatical-

ly adjusts to changes in background room noise

 Automatic gain adjustment as additional microphones are acti-

vated

 Last Mic Lock-On circuit that maintains ambient sound
 Adjustable low-frequency rolloff and high-frequency shelving

for each channel

 Channel activation and clipping indicators

OPERATING PRINCIPLES

The operating concept behind the SCM810/E Automatic Mixer is
Shure’s patented* IntelliMixcircuitry. IntelliMix delivers seam-
less automatic mixing by combining three separate functions:

• Noise Adaptive Threshold. Distinguishes between constant

background noise (such as a ir c onditioning) and changing s ound
(such as speech) for e ach i nput c hannel. It continuously adjusts
the activation t hreshold s o t hat o nly s peech l evels louder than the
background noise activate a channel.

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 SCM810/E operates on 100–120 Vac power; the SCM810E
operates on 220–240 Vac power. Each mixer is supplied with a
power cord, rack-mounting hardware, and a link cable.

 Peak-responding output limiter with selectable thresholds and

LED indicator

• Active balanced microphone-level XLR inputs and an active

balanced Mic/Line level XLR output

 Aux-level input with manual level control
 Front-panel headphones output with level control
 Linking capability for up to 400 microphones

• 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 back­ground ambience is always present.

3

FRONT PANEL FEATURES

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

Á

ÁÁ

ÁÁÁÁ

Á

Á

1.Microphone Channel Gain Controls 1 - 8: Allows adjust­ment of microphone gain.

2.Input LED 1 - 8: Lights green when channel is active; lights red
at 6 dB below clipping level.

3.Low-Cut Filter 1 - 8: Recessed screwdriver adjustment pro­vides adjustable low-frequency rolloff (high pass) to reduce
undesirable low-frequency signals.

4.High-Frequency Shelving Filter 1 - 8: Provides level boost
or cut in mid/high-frequency region to compensate for off-axis
tone coloration, or for cutting high-frequency sibilance.

5.AUX Level Control: Sets the input level for aux-level equip­ment connected to the adjacent

1

/4-inch INPUT phone jack or

rear-panel 1/4-inch AUX input.

REAR PANEL FEATURES

Á

ÁÁ

Á

Á

11

120VAC 50/60 Hz 200mA

Á

Á

MICROPHONE LOGIC

ÁÁ

ÁÁÁ

Á

1312 18

LINK
OUT

14

17

AUX/D.O/D.O

LINK

IN

DIRECT

(SWITCH)

LINE

OUTPUT

+

OUT

AUX IN

MIC/PHM/LINE

SWITCH

Ć

+

15 16

1

6.Aux INPUT

/4-inch Phone Jack: Mixes external auxiliary- or

line-level sources into output. This out is not automatic. Signal
appears at output of all linked mixers.

7.MASTER Level Control: Determines the overall mix level.

8.Output Level Meter: Nine-segment LED meter indicates
peak output signal level. Last LED indicates limiter action.

9.PHONES Control and 1/4-inch Phone Jack: Permits moni­toring of mixer output through headphones. The PHONES
knob controls headphones output level.

10. POWER LED: Lights green when unit is powered.

DIRECT

OUT

78

Ć

MIC/PHM/LINE

MIC/PHM/LINE

SWITCH

SWITCH

Ć

+

DIRECT

OUT

MIC/PHM/LINE

SWITCH

Ć

+

DIRECT

OUT

MIC/PHM/LINE

SWITCH

Ć

+

DIRECT

OUT

MIC/PHM/LINE

SWITCH

+

MIC/PHM/LINE

SWITCH

Ć

+

DIRECT

OUT

MIC/PHM/LINE

SWITCH

Ć

+ +

DIRECT

OUT

Ć

PHANTOM

19

MIC

LEVEL

DIRECT

OUT

123456

MIC/PHM/LINE

SWITCH

Ć

LINE

LEVEL

Á

Á

Á

MODEL SCM810 REAR PANEL

11 . AC Power Connector and Rocker Switch: Connector sup-

plies AC power to unit when plugged into a power source: the
rocker switch turns the unit on.

12. Microphone Logic: DB-25 male connector interfaces with
each channel’s GATE OUT, MUTE IN, and OVERRIDE IN
logic terminals. See the Suggested Logic Applications sec­tion. NOTE: THIS IS NOT AN RS-232 PORT.

13. DIP Switch: The 7-position DIP switch provides setup op­tions for the mixer (see DIP Switches section).

14. LINK IN/OUT Jacks: Allow multiple m ixers to be stacked for
additional inputs. Up to 50 SCM810 mixers can be linked.

15. LINE OUTPUT Removable Block Connector: Active bal­anced line-level signal for connection to amplifiers, recorders
or other mixers. Output can be modified to microphone level
(see Internal Modifications).

(SWITCH BEHIND

FIGURE 2

16. DIRECT OUT

1

/4-inch Phone Jacks: P rovides non-gated aux-

CONNECTOR)

level signal from each channel. Direct outs are wired pre-fader
and pre-EQ. C an b e m odified f or u se a s a gated channel output,
send/receive insert point, or external speech gate for mixing
consoles (see Internal Modifications section).

17. AUX/D.O./D.O. Switch: Located behind the Line Output con ­nector, t his s witch s elects either aux input f unction o r d irect o ut­put function for channel 8 D irect O ut j ack. L eft switch p osition i s
AUX IN; center and right positions are DIRECT OUT.

18. INPUT 1-8 Removable Block Connectors: Active balanced
microphone- or line-level inputs.

19. Input 1 - 8 MIC/PHM/LINE Switch: Located behind the re­movable block connector, this switch selects operation at ei­ther microphone-level (left), microphone-level with 48 V
phantom power (center), or line-level (right) signals.

4

DIP SWITCHES

The rear-panel DIP switch provides the following setup options.
The positions shown in bold type are the factory settings.

(MIXER

REAR

PANEL)

1 2 3 4 5 6 7

MODIFIABLE FUNCTION SWITCHES

FIGURE 3

DIP SWITCH SW702 FUNCTIONS

Switch

Function

Switch Position

Number→

Switch Up Auto On 0.4 second 15 dB

Manual/Auto Last Mic

Lock-On

1 2 3 4 5,6 7

Hold Time Off-Attenuation

NOTE: Switch positions and effects are shown in Figure 3 and

also on the mixer label.

Level

DIP

SWITCH

SW702

Limiter

Threshold

5 Up
= Limiter off
6 Up

5 Down
= +8 dBm
6 Up

5 Up
= +16 dBm
6 Down

Link

Local/Global

Global

Switch Down Manual All mics off after

hold time

1.0 second

Manual/Auto: Automatic activation is defeated in the Manual
position. In Manual mode, functions as a standard 8x1 mixer.

Last Mic Lock-On: Last Mic Lock-On feature keeps the most re­cently activated microphone turned on until a newly activated mi­crophone takes its place. When defeated, microphones turn off
after their preset hold time.

Hold Time: Adjusts the time an activated microphone (which is
not locked on) remains on after the talker stops talking. Settings
are 0.4 seconds or 1.0 second.

5 Down
= +4 dBm
6 Down

∞ (completely off)

Local

Off-Attenuation: Changes the off-attenuation level from 15 dB
to infinity (∞). With the 15 dB setting, an unused microphone is 15
dB lower in level than when it is activated. With the ∞ setting, an
unused microphone is completely off.

Limiter Threshold: Changes the output limiter threshold. Set­tings are OFF (factory setting), +16 dBm, +8 dBm, or +4 dBm
(see Internal Modifications for other threshold settings).

Link Global/Local: Determines whether each linked SCM810
output contains only its own program output, or that of all linked
mixers (see Mixer Linking for more information).

5