8-channel automatic mixer improves audio quality in any application in which multiple microphones are required. Features include fast microphone selection, adjustable EQ, adjustable low-frequency roll off, and peak-responding output limiter. Eight balanced mic-line input channels (Phoenix block connectors) One unbalanced 1/4" aux level input Eight unbalanced 1/4" direct line level outputs One balanced master line level output (Phoenix block connector) Selectable 46V phantom power per channel Level selectable peak output limiter Full rack width (single rack height) This eight-channel automatic mixer features the Shure IntelliMix®, which activates only microphones being addressed, minimizing poor audio caused by multiple open microphones. The SCM810 is designed specifically for installed sound applications. Features include adjustable EQ per channel, 48 V phantom power, active balanced microphone - or line-level inputs, line-level outputs, highly RF resistant chassis and circuitry, complete logic control of microphone activation, linking capacity for up to 400 microphones, with an internal power supply. 120/230 Vac power. General 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 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 SCM810 operates on 120 Vac power; the SCM810E operates on 230 Vac power. Each mixer is supplied with a power cord, rack-mounting hardware, and a link cable. System Features Fast-acting, noise-free microphone selection that automatically adjusts to changes in background room noise Automatic gain adjustment as additional microphones are activated 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 Peak-responding output limiter with selectable thresholds and LED indicator Active balanced mic/line inputs and line/level output Aux-level input with manual level control Front-panel headphones output with level control Linking capability for up to 400 microphones Specifications (typical, controls full clockwise) Line Headphone Direct Output (typical, controls full clockwise) Low Impedance Mic (150 Ω) 80 dB 88 dB 34 dB Line 40 dB 48 dB -6 dB Aux 44 dB kΩ 52 dB - Send/Return 20 dB 28 dB - Inputs Impedance Designed for use with Typical Output Clipping Level Mic 19-600 Ω 1.6 kΩ -15 dBV Line ≤2 kΩ 10 kΩ +22 dBV Aux ≤2 kΩ 10 kΩ +22 dBV Send/Return ≤2 kΩ 10 kΩ +18 dBV Outputs Impedance Designed for use with Typical Output Clipping Level Line >600 Ω 60 Ω +18 dBV Headphone 8-200 Ω, 60 Ω recommended 300 Ω +12 dBV Direct Output >2 kΩ 1 kΩ +18 dBV Send/Return >2 kΩ 1 kΩ +18 dBV Total Harmonic Distortion 70 dB at 1 kHz Polarity Mic/Line, Send inputs to all outputs are non-inverting; Aux input to all outputs is inverting Input Channel Activation Attack Time 4 ms Hold Time 0.4 ms (Switchable to 1.0 s) Decay Time 0.5 s Off-Attenuation 15 dB (switchable to∞) Overload and Shorting Protection Shorting outputs, even for prolonged periods, causes no damage. Microphone inputs are not damaged by signals up to 3 V; Lines and Monitor inputs by signals up to 20 V Equalization Low-frequency 6 dB/octavecut, adjustable corner from 25 to 320 Hz High-Frequency ±6 dBat 5 kHz, ±8 dBat 10 kHz, shelvingat 5 Limiter Type Peak Threshold Switchable: off, +4, +8, +16 ( dBm at output) Attack 2 ms Recovery 300 ms Indicator Lights red when limiting occurs Input LEDs Green on channel activation, red at 6 dBbelow clipping Phantom Power 46 V DC open-circuit through 6.8 k Ω series resistance per DIN 45 596 Operating Voltage SCM810 120 V AC rated nominal, 50/60 Hz, 200 mA SCM810E 230 V AC rated nominal, 50/60 Hz, 100 mA Temperature Range Operating Temperature 0° to 60° C (32° to140° F) Storage Temperature -30° to 70° C (-20° to165° F) Dimensions 44.5 mm H x 483 mm W 317 mm D (1¾ x 19 x 12½ in.) Net Weight 4.3 kg (9 lb ., 9 oz.)
