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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 Ω, Aux Level 150 Ω; terminations: Line 600 Ω, Mic 600 Ω, Aux Out 10 kΩ. 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
Gain (typical, controls full clockwise)
Inputs
Outputs
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 Ω source; through 22
Hz—22 kHz filter)
124 dBV
Output Hum and Noise (through 22 Hz—22 kHz filter; chan-
nel 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 340Ω 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 Euro-
pean EMC Directive 89/336/EEC. Meets applicable tests and
performance criteria in European Standard EN55103 (1996)
parts 1 and 2, for residential (E1) and light industrial (E2) en-
vironments.
Replacement Parts
Knob, Master (blue) ............................................... 95B8752
Knob, Channel Gain (white)................................... 95A8752
Line (Power) Cords:
SCM268: 100-120 Vac (US/Canada)................95A8762
SCM268E: 220-240 Vac (EU) ........................... 95A8778
Fuse, SCM268 (5x20 mm,
250V, 80mA, slow-blow)........................................... 80A730
Fuse, SCM268E (5x20 mm,
250V, 40mA, slow-blow)............................................80J258
Hardware Kit ........................................................90AF8100
Link Bars (Bracket) ................................................ 53A8443
Single Mount Bracket............................................. 53A8484
Dual Mount Bracket ............................................... 53B8484
Optional Accessories
Line (Power) Cord, 230-240 Vac (UK) ...................95A8713
Input Output
Mic Line Aux Out
Low-impedance mic
(150 Ω)
38 dB 76 dB 65 dB
Aux Level 3 dB 40 dB 29 dB
Input Impedance
Designed for
use with
Actual
(typical)
Input
Clipping Level
Mic 19-600 Ω 1.2 kΩ –5 dBV
Aux Level
≤2 kΩ
21 kΩ >28 dBV
Output Impedance
Designed for
use with
Actual
(typical)
Output
Clipping Level
Mic low-Z inputs 0.2 Ω –21 dBV
Line >600 Ω 72 Ω +18 dBV
Aux Out >2 kΩ 870 Ω +7 dBV