Shure SCM268E, User Manual, Page: 8 / 28

8
Hot Mic Pad
Some condenser mics have a high output. In order to avoid overdriving the
input stage, the user may need to set the input pot lower than desired. To
fix this problem, the user can place an 11 dB pad into the input gain stage
of a selected channel.
1. Twist together the leads from one side of a 15
kΩ resistor and a 0.1 µF capacitor:
0.1 µF
2. Solder the free ends of the resistor-capacitor combination into
the holes at the jumper position indicated by the following ta-
ble and remove the corresponding surface mount resistor.
Channel Remove Resistor
Insert Resistor-Capacitor
Combination at Jumper
1 R18 X17
2 R28 X27
3 R38 X37
4 R48 X47
Specifications
Frequency Response
at 1 kHz
Mic/Line Switch 150 Hz to 20 kHz ±2 dB
Aux Input 20 Hz to 20 kHz ±2 dB
Low-Cut Filter
-6 dB/octave below 80 Hz
Total Harmonic Distortion
1 kHz, +4 dBu out, mix output (MASTER) at +0 dB
<0.25%
Equivalent Input Noise
150Ω balanced source, A-Weighted
-130 dBV
Output Noise
channel controls full counterclockwise, A-Weighted
Master full counterclockwise -107 dBV
Master full clockwise -73 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; Line and Aux inputs by signals up to +28 dBV
Phantom Power
12 Vdc open-circuit through 680 Ω resistors
Operating Voltage
SCM268 100–200 V AC, 50/60 Hz, 60 mA
SCM268E 220–240 V AC, 50/60 Hz, 30 mA
Temperature Range
Operating Temperature -7° – 35 ° C (20° – 95 ° F)
Storage Temperature -29° – 74° C (-20° –165° F)
Dimensions
44 x 218 x 162 mm (1.72 x 8.60 x 6.37 in.)
Net Weight
1.20 kg (2 lbs, 10 oz.
Optional Accessories and Replacement
Parts
Knob, Master (blue) 95B8752
Knob, Channel Gain (white) 95A8752
Line (Power) Cords: SCM268: 100-120 Vac (US/
Canada) 95A8762
Line (Power) Cords: 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 90AW8100
Link Bars (Bracket) 53B8443
Single Mount Bracket 53A8484
Dual Mount Bracket 53E8484
Line (Power) Cord, 230-240 Vac (UK) 95A8713
Certifications
This product meets the Essential Requirements of all relevant European
directives and is eligible for CE marking.
The CE Declaration of Conformity can be obtained from: www.shure.com/
europe/compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
Jakob-Dieffenbacher-Str. 12
75031 Eppingen, Germany
Phone: 49-7262-92 49 0
Fax: 49-7262-92 49 11 4
Email: info@shure.de
15 KΩ