1.) Gain Controls (1-4) - Adjusts gain for microphone level inputs and auxiliary level inputs 1-4

2.) Auxiliary Channel Gain Control (AUX IN) - Adjusts the auxiliary channel input gain

3.) Output Meter - LED meter indicates peak output signal level

4.) Master Gain Control (MASTER) - Adjusts overall output level

5.) Power Indicator (Power)  - This LED illuminates when the unit is plugged in and receiving power

Rear Panel Features:

1.) Power Connector - Accepts 100-200 Vac (SCM268) or 220-240 Vac (SCM268E)

2.) Output Connector (MIC/LINE OUT) - Transformer-balanced XLR output connector. Switchable between line and microphone level

3.) Output Level Switch (MIC/LINE OUT) - Recessed switch changes the signal level of the XLR output connector: In = Microphone Level Out  = Line Level

4.) Auxiliary Output Connector (AUX OUT) - Phono jack feeds consumer-level audio equipment. Not affected by MIC/LINE switch

5.) Auxiliary Level Inputs (AUX LEVEL INPUTS 1-4) - Phono jacks connect to consumer-level audio sources

6.) Auxiliary Input Channel (AUX IN) - A dedicated auxiliary-level input for the auxiliary channel

7.) Phantom Power Switch (12V Phantom) - Recessed switch turns on phantom power for microphone inputs 1-4

8.) Microphone Level Inputs (MIC LEVEL INPUTS) - Transformer-balanced, microphone-level XLR inputs

Sample Connections:

Specifications:

Inputs

• 4 - Balanced XLR Microphone
• 2 - Stereo (L/R) RCA line inputs

Output

• 1 - Balanced XLR output (mic/line level)
• 1 - AUX unbalanced RCA Phono

Monitor/Headphone Out .............No - AUX output serves as secondary output and cab be used as a monitor source

ALT I/O...............................2- AUX RCA phono as described under outputs

Link Input/Output .........................No

Impedance

Input

• MIC (XLR): Designed for use with 19-600 ohm load, 1.2k ohms actual, -5dBV clipping level
• AUX: Designed for use with - / < 2k ohm load, 21k ohms actual, >28 dBV clipping level

Outputs

• MIC: Designed for use with low-Z inputs, 0.2 ohms actual, -21 dBV clipping level
• LINE: Designed for use with > 600 ohms, 72 ohms actual, +18 dBV clipping level
• AUX: Designed for use with > 2k ohms, 870 ohms actual, +7dBV clipping level

Gain

• Low-Impedance Mic Input (150 ohms): MIC 32dB, LINE 72dB, AUX 60dB - Outputs
• Line Input: MIC -9dB, LINE 31dB, AUX 19dB - Outputs
• Stereo Input: MIC -5dB, LINE 35dB, AUX 23dB - Outputs

Hum & Noise

• Equivalent Input Hum and Noise: -124 dBV (150 ohm source; 22Hz to 22kHz)
• Output Hum and Noise: (22 Hz to 22kHz; channel controls full counterclockwise)
• Master full counterclockwise -92dBV
• Master full clockwise -70dBV

Frequency Response

•  (Ref 1kHz, channel and master controls centered) MIC/LINE Inputs: 150Hz to 20kHz + / - 2dB
• AUX Inputs: 20Hz to 20kHz + / -2dB

Distortion..................<0.25% at +4 dBu output level, (through 22Hz -22kHz filter; MIC inout 1 and Master at center, all other controls full counterclockwise)

Metering...................6-segment LED meters

Controls

• Sealed Rotary Potentiometers: MIC 1-2, STEREO 1-3 and MASTER gain controls. BASS and TREBLE control.
• DIP Switches

Control Voltage Out...................No

Phantom Power..............................12 Vdc open-circuit through 340 ohm series resistors

Operating Temperature

• Operating: -7 to 49 degrees C (20 to 120 degrees F)
• Storage: -29 to 74 degrees C (-20 to 165 degrees F)

Power

• SCM268: 100 - 120 Vac, 50/60 Hz, 60mA
• SCM268E: 220 - 240 Vac, 50/60 Hz, 30mA

Dimensions..............1.72 x 8.60 x 6.37 in. (43 x 218 x 162mm)

Weight........................ 2.62 lbs (1.20 kg)