SCM810

This eight-channel automatic mixer features the Shure patented 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.

• 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 48V phantom power per channel
• Level selectable peak output limiter
• Full rack width (single rack height)

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 ohms, Line 150 ohms terminations: Line 10 kilohms, Phones 300 ohms (tip-sleeve and ring-sleeve), Direct Out 10 kilohms; 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)

Input	Output
	Line	Headphones	Direct Out
Low-Impedance Mic (150 ohms)	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

Input	Impedance		Input Clipping Level
	Designed for use with	Actual (typical)
Mic	19-600 ohms	1.6 kilohms	-15 dBV
Line	<2 kilohms	10 kilohms	+22 dBV
Aux	<2 kilohms	10 kilohms	+22 dBV
Send/Return	<2 kilohms	10 kilohms	+18 dBV

Outputs

Output	Impedance		Output Clipping Level
	Designed for use with	Actual (typical)
Line	>600 ohms	60 ohms	+18 dBV
Headphones	8-200 ohms 60 ohms recommended	300 ohms	+12 dBV
Direct Out	>2 kilohms	1 kilohm	+18 dBV
Send/Return	>2 kilohms	1 kilohm	+18 dBV

Total Harmonic Distortion

<0.1% at +18 dBV output level, 50 Hz to 20 kHz (through 20 Hz-20 kHz filter; Input 1 and Master at 5, all other controls full counterclockwise)

Hum and Noise

Equivalent Input Noise: -125 dBV (150 ohm source; through 400 Hz - 20 kHz filter)

Equivalent Input Hum and Noise: -123 dBV (150 ohm source; through 20 Hz - 20 kHz filter)

Output Hum and Noise (through 20 Hz to 20 kHz filter; channel controls full counterclockwise))

Master full counterclockwise: -90 dBV

Master full clockwise: -70 dBV

Common Mode Rejection

>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 s (switchable to 1.0 s)

Decay Time: 0.5 s

Off-Attenuation

15 dB (switchable to infinity)

Overload and Shorting Protection

Shorting outputs, even for prolonged periods, causes no damage. 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 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

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 in User Guide), 50/60 Hz, 200 mA

SCM810E: 230 Vac rated nominal (see Voltage Selection in User Guide for 120 Vac operation), 50/60 Hz, 100 mA

Temperature Range

Operating: 0 degrees to 60 degrees C (32 degrees to 140 degrees F)

Storage: -30 degrees to 70 degrees C (-20 degrees to 165 degrees F)

Overall Dimensions

44.5 mm H x 483 mm W x 317 mm D (13/4 x 19 x 121/2 inches)

Net Weight

4.3 kg (9 lb 9 oz)