Specifications

6
English –
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 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 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)
Inp t
Output
Input
Mic
Line Aux Out
Low-impedance
mic (150 Ω)
38 dB 76 dB 65 dB
Aux Level 3 dB 40 dB 29 dB
Inputs
Impedance
Input
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
Outputs
Impedance
Output
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
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 counterclockwise)
Hum and Noise
Equivalent Input Hum and Noise –124 dBV . . . . . . . . . . . . . . . .
(150 Ω source; through 22 Hz - 22 kHz filter)
Output Hum and Noise (through 22 Hz to 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 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, 11 oz)
Certifications
SCM268: UL & cUL Listed by Underwriters Laboratories, Inc.
SCM268E: Conforms to European Union directives, eligible to
bear CE marking; VDE GS-Certified to EN 60 065; meets Euro-
pean Union EMC Immunity Requirements (EN 50 082–1, 1992)
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.
Optional Accessories
Line (Power) Cord, 230–240 Vac (UK) 95A8713. . . . . . . . . . . . .