SCM268 SHURE, SCM268 Datasheet
SCM268
Manufacturer Part Number
SCM268
Description
Microphone Mixer, Transformer Balanced
Manufacturer
SHURE
Datasheet
1.SCM268.pdf
(2 pages)
Specifications of SCM268
Temperature Max
49°C
Size
44 Mm H X 218 Mm W X 162 Mm D
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
TL1028 (CB)
©2008 Shure Incorporated
SYSTEM FEATURES
SPECIFICATIONS
and exceptional sound quality with low noise and a flat frequency response.
anced XLR output, phono jack inputs and output, phantom power, and an auxiliary input channel. It can function as a primary or add-on mixer for
sound reinforcement, recording, broadcast, or audio-visual presentation systems.
SCM268 can be fastened on or below a shelf, counter, or tabletop.
Input
Low-impedance mic
(150 Ω)
Aux Level
Input
Mic
Aux Level
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)
Low-Cut Filter (Microphone inputs only)
Gain (typical, controls full clockwise)
Inputs
The Shure Model SCM268 is a transformer-balanced, four-channel microphone mixer. Its simple, compact design delivers superior performance
Versatile in all types of applications, the SCM268 integrates transformer-balanced XLR inputs, a switchable microphone/line level transformer-bal-
With the supplied hardware, the mixer's half-rack chassis mounts securely in single or dual rackmount installations. For fixed installations, the
Microphone Inputs: 150 Hz to 20 Khz + 2 dB (built-in 80 Hz low-cut)
Auxiliary Inputs: 20 Hz to 20 kHz + 2 dB
3dB down at 80 Hz, 6 dB/octave
• Four transformer-balanced microphone inputs
• Transformer-balanced output-switchable mic/line level
• Five –10 dB line-level inputs
• Six-segment LED output level meter
Impedance
Designed for
use with
19-600 Ω
32 kΩ
Output
Mic
38 dB
3 dB
SCM268 TRANSFORMER BALANCED MICROPHONE MIXER
Actual
(typical)
1.2 kΩ
21 kΩ
Line
76 dB
40 dB
Input
Clipping Level
–5 dBV
>28 dBV
Aux Out
65 dB
29 dB
Output
Mic
Line
Aux Out
Outputs
Total Harmonic Distortion
Hum and Noise (150 Ω source; through 22 Hz–22 kHz filter)
Output Hum and Noise (through 22 Hz–22 kHz filter; channel con-
trols full counterclockwise)
Common Mode Rejection
Polarity
Overload and Shorting Protection
<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: –124 dBV
Master full counterclockwise: –92 dBV
Master full clockwise: –70 dBV
>80 dB at 1 kHz
All inputs to all outputs are non-inverting
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
• Built-in 12-volt phantom power
• Internal power transformer
• Built-in low-cut filter on microphone inputs (below 80 Hz)
Impedance
Designed for
use with
low-Z inputs
>600 Ω
>2 kΩ
SCM268 Microphone Mixer
Actual
(typical)
0.2 Ω
72 Ω
870 Ω
Specification Sheet
Output Clipping
Level
–21 dBV
+18 dBV
+7 dBV
Related parts for SCM268
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
CARDIOID DYNAMIC, LOW Z, HEAD WORN WITH SINGLE EARPHONE
Manufacturer:
SHURE
Part Number:
Description:
PTH Control Device, 2 Detachable Cables (9" And 3)
Manufacturer:
SHURE
Part Number:
Description:
Omnidirectional Whip Antenna For UR1 Bodypack Transmitters, 518-578MHz
Manufacturer:
SHURE
SCM268 Summary of contents
Page 1
... SCM268 TRANSFORMER BALANCED MICROPHONE MIXER The Shure Model SCM268 is a transformer-balanced, four-channel microphone mixer. Its simple, compact design delivers superior performance and exceptional sound quality with low noise and a flat frequency response. Versatile in all types of applications, the SCM268 integrates transformer-balanced XLR inputs, a switchable microphone/line level transformer-bal- anced XLR output, phono jack inputs and output, phantom power, and an auxiliary input channel ...
Page 2
... Phantom Power 12 Vdc open-circuit through 340Ω series resistance Operating Voltage SCM268: 100-120 Vac rated nominal, 50/60 Hz SCM268E: 220-240 Vac rated nominal, 50/60 Hz Temperature Range Operating: –7° to 49° C (20° to 120° F) Storage: –29° to 74° C (–20° to 165° F) ...