Shure SCM268

Overview

Product Details

Six Reasons the SCM268 Is The Right Choice:

Transformer. Transformer. Transformer. Transformer. Transformer. Transformer.

Great Value

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.

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, such as:

• 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

SCM268 TRANSFORMER BALANCED MICROPHONE MIXER

The Shure Model SCM268 is a transformer- balanced, four-channel microphone mixer. Its si mple, compact design delivers superior p erformance and exceptional sound quality with lo w noise and a flat frequency response.

Versatile in all types of applications, t he SCM268 integrates transformer-balanced XLR inputs, a switchable microphone/line lev el transformer-bal- anced XLR output, phono jack inputs and output, phantom power, and an auxiliary input channel. It can function as a primary or add-on mixer for sound reinforcement, recording, broadcast, or audio-visual presentation systems.

With the supplied hardware, the mixer's half- rack chassis mounts securely in single or dual rackmount installations. For fixed installations, the SCM268 can be fastened on or below a shelf, counter, or tabletop.

SYSTEM FEATURES

• Four transformer-balanced microphone inputs
• Transformer-balanced output-switchable mic/line level
• Five –10 dB line-level inputs
• Six-segment LED output level meter
• Built-in 12-volt phantom power
• Internal power transformer
• Built-in low-cut filter on microphone inputs (below 80 Hz)

SPECIFICATIONS

Measurement Conditions (unless other wise 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 Ω , Aux Level 150 Ω ; terminations: Line 600 Ω , Mic 600 Ω, Aux Out 10 k Ω. 12 V phantom power off

Frequency Response (Ref 1 kHz, controls centered)

• Microphone Inputs: 150 Hz to 20 Khz + 2 dB (built-in 80 Hz 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)

Hum and Noise (150 Ω source; through 22 Hz–22 kHz filter)

Equivalent Input Hum and Noise: –124 dBV

Output Hum and Noise (through 22 Hz–22 kHz filter; channel con-trols 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 Ω 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 ° to 49 ° C (20° to 120 ° F)
• Storage: -29 ° to 74 ° C (-20 ° to 165 ° 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)

Certifications

SCM268: UL & cUL Listed by Underwriters Laboratories, Inc. SCM268E: Eligible to bear CE Marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and perfor- mance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments.