SCM800 Eight Channel Microphone Mixer

The Shure Model SCM800 is a full-featured, eight-channel microphone mixer for sound reinforcement, general audio recording, and audio-visual systems. Any low-impedance, balanced

dynamic or condenser microphone, including a wireless microphone system, can be used with the SCM800 mixer.

Each SCM800 accepts up to eight microphone- or line–level inputs and one aux-level input (two input jacks feed the same channel). Up to four SCM800 mixers can be linked to provide up to 32 input channels. Each input channel has a two-band equalizer, switchable microphone- or line-level operation, switchable 48 V phantom power, and a 1/4-inch send/receive insert jack.

This full-featured, non-automatic version of the SCM810 features adjustable channel EQ, quick microphone connection and linking capability for up to 32 microphones.

• Compatible with Shure SCM410, SCM810 and FP410 automatic microphone mixers
• 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
• LED indication of channel clipping
• Linking capability for systems up to 32 microphones
• Two Aux-level input jacks that feed one channel
• Insert jack on each channel
• Manual mixing of input channels
• Internal Modification permits 230 V operation (SCM800) or 120 V operation (SCM800E)
• Front-panel headphones output with level control
• Peak-responding output limiter with selectable thresholds and LED indicator

Specification Sheet (pdf)

 

Measurement Conditions (unless otherwise specified):

Line voltage 120 Vac, 60 Hz (SCM800) or 230 Vac, 50 Hz (SCM800E); full gain; 1 kHz.

Source impedances: Mic 150 ohms, Line 150 ohms

Terminations: Line 10 kilohms, Phones 300 ohms (tip-sleeve and ring-sleeve), Direct Out 10 kilohms.

Equalization controls adjusted for flat response, Channel 1 gain control full clockwise, other gain controls full counter-clockwise

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	10 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 Hz­20 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: -62 dBV 8

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

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

Light at 6 dB below clipping

Phantom Power

46 Vdc open-circuit through 6.8 kilohm series resistance per DIN 45 596

Operating Voltage

SCM800: 120 Vac rated nominal (see Voltage Selection for 230 Vac operation in User Guide), 50/60 Hz, 200 mA

SCM800E: 230 Vac rated nominal (see Voltage Selection for 120 Vac operation in User Guide), 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 (-22 degrees to 158 degrees F)

Overall Dimensions

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

Net Weight

4.3 kg (9 lb 9 oz)