Shure SCM810 User manual

SCM810 Automatic Microphone Mixer
Specification Sheet
TL1031 (Rev. 1)
©2009 Shure Incorporated
SCM810 EIGHT-CHANNEL AUTOMATIC MICROPHONE MIXER
The Shure Model SCM810 is an automatic microphone mixer using Shure's patented IntelliMix operational concept. Intellimix activates only those
microphones being addressed, 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 channels. The single-rack-height chassis is ideal for installations with limited rack space. The re-
movable header-type input and output connectors are quick, convenient, and eliminate the time and expense of wiring XLR microphone connectors.
SYSTEM FEATURES
• Reliable, quick-acting, noise-free microphone selection
which automatically adjusts to changes in background
room noise
• User-configurable parameters for automatic operation
• Automatic gain adjustment as additional microphones are
activated (NOMA: Number of Open Microphones Attenuator)
• Last Mic Lock-On circuit maintains ambient sound
• Adjustable EQ per channel: low-frequency rolloff and high-
frequency shelving
• 48 V phantom power selectable for each input
• Active balanced microphone- and line-level inputs and line-
level output
• Highly RF-resistant chassis and circuitry
• Bi-color LED indication of channel activation and clipping
• Linking capability for systems up to 400 microphones
• Non-automatic aux-level inputs with level control
• Front-panel headphones output with level control
• Peak-responding output limiter with selectable thresh olds
and LED indicator
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 , Line 150 ;
terminations: Line 10 k, Phones 300  tip-sleeve and ring-sleeve),
Direct Out 10 k; Auto mode, equalization controls adjusted for flat
response
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)
Inputs
Outputs
Total Harmonic Distortion (through 20 Hz–20 kHz filter; Input 1 and
Master at 5, all other controls full counterclockwise)
< 0.1% at +18 dBV output level, 50 Hz to 20 kHz
Hum and Noise (150 source; through 400 Hz–20 kHz filter)
Equivalent Input Noise: –125 dBV
Equivalent Input Hum and Noise (150 source; through
20 Hz–20 kHz filter)
–123 dBV
Output Hum and Noise (through 20 Hz–20 kHz filter; channel con-
trols full counterclockwise)
Master full counterclockwise: –90 dBV
Master full clockwise: –70 dBV
Common Mode Rejection
>70 dB at 1 kHz
Output
Input Line Headphones Direct Out
Low-impedance mic
(150 )
80 dB 88 dB 34 dB
Line 40 dB 48 dB -6 dB
Aux 44 dB 52 dB –
Send/Return 20 dB 28 dB –
Impedance
Input
Designed for
use with
Actual
(typical)
Input
Clipping Level
Mic 19-600 10 k-15 dBV
Line 32 k10 k+22 dBV
Aux 32 k10 k+22 dBV
Send/Return 32 k10 k+18 dBV
Impedance
Output
Designed for
use with
Actual
(typical)
Output Clipping
Level
Line >600 60 +18 dBV
Headphones 8-200 ,
60 
recommended
300 +12 dBV
Direct Out >2 k1 k+18 dBV
Send/Return >2 k1 k+18 dBV

SCM810 AUTOMATIC MICROPHONE MIXER SPECIFICATION SHEET
SHURE Incorporated http://www.shure.com
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: [phone] U.S. Fax: [phone] Intl Fax: [phone]
Europe, Middle East, Africa:
Shure Europe GmbH, Phone: [phone] Fax: [phone]
Asia, Pacific:
Shure Asia Limited, Phone: [phone] Fax: [phone]
Polarity
Mic/Line, Send inputs to all outputs are non-inverting; Aux input
to all outputs is inverting
Input Channel Activation
Attack Time: 4 msec
Hold Time: 0.4 sec (switchable to 1.0 sec)
Decay Time: 0.5 sec
Off-Attenuation
15 dB (switchable to )
Overload and Shorting Protection
Shorting outputs, even for prolonged periods, causes no dam
age. Microphone inputs are not damaged by signals up to 3 V;
Line and Monitor inputs by signals up to 20 V
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: Switchable: off, +4, +8, +16 (dBm at output)
Attack Time: 2 msec
Recovery Time: 300 msec
Indicator: Lights red when limiting occurs
Input LEDs
Green on channel activation, red at 6 dB below clipping
Phantom Power
46 Vdc open-circuit through 6.8 kseries resistance per
DIN 45 596
Operating Voltage
SCM810: 120 Vac rated nominal (see Voltage Selection for
230 Vac operation), 50/60 Hz, 200 mA
SCM810E: 230 Vac rated nominal (see Voltage Selection for
120 Vac operation), 50/60 Hz, 200 mA
Temperature Range
Operating: 0° to 60° C (32° to 140° F )
Storage: –30° to 70° C (–22° to 158°F)
Overall Dimensions
44.5 mm H x 483 mm W x 317 mm D (1¾ x 19 x 12½ in.)
Net Weight
4.3 kg (9 lb 9 oz)
Certifications
SCM810: UL LISTED (U.S.) and cUL Certified (Canada).
SCM810E: Conforms to European Union directives, eligible to
bear CE marking.
REPLACEMENT PARTS
Knob, Master & Phones (white)....................................95A8238
Knob, Channel Gain (blue)...........................................95B8238
Line (Power) Cord (SCM810).......................................95A8389
Line (Power) Cord (SCM810E) ....................................95A8247
Link Cable .................................................................... 95A1143
APPLICATIONS
The SCM810 has numerous applications in sound rein forcement,
audio recording, and broadcast. In any speech pickup application
where multiple microphones are required, the SCM810 dramatically
improves audio quality. Automatic operation allows an individual talk-
er's voice to rise above background noise and reverberation to be-
come clearer and more intelligible.
Each SCM810 handles up to eight microphone- or line-level sig-
nals and two aux-level signals. Any high quality, low-impedance, bal-
anced dynamic or condenser microphone (in cluding wireless) can be
used. Additional SCM810 mixers (up to 50) can be interconnected us-
ing the rear-panel link jacks. Non-automatic (manual) operation is also
available.