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 k

Ω

–5 dBV

Aux Level

21 k

Ω

>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 k

Ω

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 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, 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

. . . . . . . . . . . . .