E2002, Shure Incorporated
TL1031(BH)
SCM810 STEREO MIXER
The Shure Model SCM810 is an automatic microphone
mixer using Shure’s patented IntelliMix
operational con-
cept. Intellimix activates only those microphones being ad-
dressed, minimizing the poor audio caused by multiple open
microphones. The SCM810 is an eight-channel mixer capa-
ble of being linked for installations as large as 400 input chan-
nels. The single-rack-height chassis is ideal for installations
with limited rack space. The removable header-type input
and output connectors are quick, convenient, and eliminate
the time and expense of wiring XLR microphone connectors.
SYSTEM FEATURES
S Reliable, quick-acting, noise-free microphone selection
which automatically adjusts to changes in background
room noise
S User-configurable parameters for automatic operation
S Automatic gain adjustment as additional microphones
are activated (NOMA: Number of Open Microphones At-
tenuator)
S Last Mic Lock-On circuit maintains ambient sound
S Adjustable EQ per channel: low-frequency rolloff and
high-frequency shelving
S 48 V phantom power selectable for each input
S Active balanced microphone- and line-level inputs and
line-level output
S Highly RF-resistant chassis and circuitry
S Bi-color LED indication of channel activation and clipping
S Linking capability for systems up to 400 microphones
S Non-automatic aux-level inputs with level control
S Front-panel headphones output with level control
S Peak-responding output limiter with selectable thresh-
olds and LED indicator
S Internal modification permits 120 V operation (SCM810)
or 230 V operation (SCM810E)
SPECIFICATIONS
Measurement Conditions (unless otherwise specified):
Line voltage 120 Vac, 60 Hz (SCM810) or 230 Vac, 50 Hz
(SCM810E); full gain; 1 kHz, one channel activated; source
impedances: Mic 150 Ω, Line 150 Ω; terminations: Line 10
kΩ, Phones 300 Ω (tip-sleeve and ring-sleeve), Direct Out 10
kΩ; Auto mode, equalization controls adjusted for flat re-
sponse
Frequency Response (Ref 1 kHz, channel controls centered)
50 Hz to 20 kHz ±2 dB; -3 dB corner at 25 Hz
Voltage Gain (typical, controls full clockwise)
Output
Input Line Head-
phones
Direct Out
Low-impedance
mic (150 Ω)
80 dB 88 dB 34 dB
Line 40 dB 48 dB –6 dB
Aux 44 dB 52 dB —
Send/Return 20 dB 28 dB —
Inputs
Impedance
Input
Designed
for use with
Actual
(typical)
Input
Clipping
Level
Mic 19-600 W 10 kW -15 dBV
Line
32 kW
10 kW +22 dBV
Aux
32 kW
10 kW +22 dBV
Send/Re-
turn
32 kW
10 kW +18 dBV
SCM 810 Automatic Microphone Mixer
Specification Sheet
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