4-Channel Microphone Mixer

The Shure Mixer & DSP Series SCM 268 microphone mixer features six transformers inside: four transformer balanced XLR microphone-level inputs, one transformer balanced XLR mic/line output, and one internal low stray field, toroidal power transformer.

All those audio transformers provide protection from RF interference, prevent ground loops, and make the SCM268 exceptionally quiet. The internal toroidal power transformer means you no longer have to deal with that annoying "wall wart."

Add to this a rugged half-rack chassis -- with exceptionally solid rack mounting hardware -- and the SCM-268 will easily fit into the widest range of smaller applications, such as: Meeting rooms, Houses of worship, Broadcast, Educational paging and public address and Sound system rental.

For over a generation, Shure mixers, as well as a host of other Shure products, have been chosen for installed sound applications with unparalleled peace-of-mind. The SCM268 continues this tradition of quality performance at a great value. If you want half a dozen transformers in a half-rack space, choose the SCM268.

→ Five unbalanced aux level inputs (Phono connectors)
→ LED peak output meter
→ One unbalanced aux level output (Phono connector)
→ IEC power cord connector
→ 12V phantom power for condenser microphones
→ Built-in low cut filters on mic inputs
→ Unit fits into a half-rack space and includes all the necessary rack mounting hardware

Measurement Conditions (unless otherwise specified)	Line voltage 120 Vac, 60 Hz (SCM268) or 230 Vac, 50 Hz (SCM268E); full gain; 1 kHz, one channel activated; source impedances= Mic 150 ohms, Aux Level 150 ohms; terminations= Line 600 ohms, Mic 600 ohms Aux Out 10 kilohms 12 V phantom power off
Frequency Response (Ref 1 kHz, controls centered)	Microphone Inputs= 150 Hz to 20 Khz /- 2 dB (built-in 80Hz low-cut); Auxiliary Inputs= 20 Hz to 20 kHz /- 2 dB
Low-Cut Filter (Microphone inputs only)	3dB down at 80 Hz, 6 dB/octave
Total Harmonic Distortion	<0.25% at 4 dBu output level (through 22 Hz-22 kHz filter; Input 1 and Master centered, all other controls full counter-clockwise)
Equivalent Input Hum and Noise(150 ohm source; through 22 Hz-22 kHz filter)	124 dBV
Output Hum and Noise (through 22 Hz-22 kHz filter; channel controls full counterclockwise)	Master full counterclockwise= -92 dBV; Master full clockwise= -70 dBV
Common Mode Rejection	>80 dB at 1 kHz
Polarity	All inputs to all outputs are non-inverting
Overload and Shorting Protection	Shorting outputs, even for prolonged periods, causes no damage. Microphone inputs are not damaged by signals up to 10 dBV; Auxiliary inputs by signals up to 36 dBV
Phantom Power	12 Vdc open-circuit through 340 ohm series resistance
Operating Voltage	SCM268= 100-120 Vac rated nominal, 50/60 Hz, 60 mA; SCM268E= 220-240 Vac rated nominal, 50/60 Hz, 30 mA
Operating Temperature Range	-7 degrees to 49 degrees C (20 degrees to 120 degrees F)
Storage Temperature Range	-29 degrees to 74 degrees C (-20 degrees to 165 degrees F)
Overall Dimensions	44 mm H x 218 mm W x 162 mm D (1.72 x 8.60 x 6.37 inches)
Net Weight	1.20 Kg (2 lbs, 10 oz)