Shure SCM268 4-Channel Microphone Mixer

The competitively-priced SCM268 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. Additionally, it has 5 -10 dB line-level inputs, 12 volt phantom power, and built-in low-cut filter. The unit delivers superior performance and excellent sound quality with low noise and a flat frequency response.

Many Benefits, Little Space
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 SCM268 will easily fit into the widest range of smaller applications includng:

• Meeting rooms
• Houses of worship
• Broadcast
• Educational paging and public address
• 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.

Features:

• 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.

Specifications:

• 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

  Temperature Range:

• Operating: -7 degrees to 49 degrees C (20 degrees to 120 degrees F)
• Storage: -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)

Applications:

• Meeting rooms
• Houses of worship
• Broadcast
• Educational paging and public address
• Sound system rental