Shure SCM268E manual Specifications

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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.

ENGLISH

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)

Input		Output
	Mic	Line	Aux Out
Low-impedance mic	38 dB	76 dB	65 dB
(150 Ω)
Aux Level	3 dB	40 dB	29 dB

Inputs

Input	Impedance
	Designed for	Actual	Input
	use with	(typical)	Clipping Level
Mic	19-600 Ω	1.2 kΩ	–5 dBV
Aux Level	≤	21 kΩ	>28 dBV
	2 kΩ
Outputs
Output	Impedance
	Designed for	Actual	Output
	use with	(typical)	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 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 dam- age. 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

1.20Kg (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) environ-

ments.

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
SCM268E (Australia/New Zealand)	95A9128
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

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