Shure M268 Datasheet

GENERAL
The Shure Model M268 is a highly versatile portable
microphone mixer designed for use with sound rein-
forcement, tape recording and audio-visual systems. Its
excellent operational characteristics, compact size,
and functional capabilities make the M268 a fine choice
as a primary or add-on mixer in any sound system.
222 HARTREY AVENUE S H U m e
EVANSTON. ILLINOIS 6 0 2 0 2 - 3 6 9 6 U.S.A.
T H E SOUND OF T H E W F E S S I O N A U B \VORLWIDE
MICROPHONES AND ELECTRONIC COMPONENTS
M268 Features:
DATA SHEET
MODEL M268
MICROPHONE MIXER
Wide, flat frequency response and extremely low
distortion at full output
Very low line noise and radio frequency in-
terference susceptibility
Four low-impedance balanced and four high-
impedance unbalanced inputs
High-level auxiliary input for tape, tuner and
accessories
Individual feedback-type active gain controls for all
five inputs
Master volume control sets overall output level
Phantom power for condenser microphones
High- (unbalanced) and low-impedance (balanced)
microphone-level output matches most amplifier
inputs
High-impedance auxiliary outputs for high-level
equipment inputs
Direct mix bus for simple mixer interconnection
("stacking")
Automatic muting circuit prevents speaker damage
during turn-on and -off
Regulated power supply is unaffected by line
voltage fluctuations
Compact and lightweight, with rugged, abrasion-
resistant case
Listed by Underwriters' Laboratories, Inc. and listed
by Canadian Standards Association as Certified
SPECIFICATIONS
Frequency Response
40 Hz to 20,000 Hz,
+
3 dB
Voltage Gain (at 1,000 Hz)
(Outputs terminated: mic 150 ohm133 kilohms;
aux 47 kilohms; mix bus 3.3 kilohms)
INPUT
High-Impedance
Micro~hone
!
+5dB r 3 l d B + 5 5 d B
I
OdB
/
Low-Impedance
Microphone
OUTPUT
Inputs
Lo Imp
Mic
I I I
+28 dB
Aux In
Mix Bus
'
Depending on control setting
Hi Imp
Mic
+54 dB
Distortion
0.2% or less THD from 40 to 20,000 Hz with lo imp
mic output at 60 mV level, hi imp mic output at 1.5V
-16dB
-8dB
Input Clipping
Level
-32 to - 5 dBV*
(25 mV to 0.56V)
-
I 0 to
+
18 dBV'
(0.32V to 7.9V)
+ I 4 to +30 dBV'
(5.OV to 32V)
+ 8 dBV
(2.5V)
INPUT
Lo Imp Mic
Hi Imp Mic
Aux
Mix Bus
level, and aux out at 7.OV level
Aux Out
+78 dB
+ I 0 dB
+ 1 8 d B
+ 3 4 d B
+ 4 2 d B
Copyright 1995, Shure Brothers Inc.
27A8432 (OH) Pr~nted ln U.S.A
Mix Bus
+23 dB
-21 dB
- -
IMPEDANCE
Designed
for use with
Bal or unbal
19 to 600 ohms
Unbal 10 to 50
kilohms
100 ohms to 10
kilohms high-
level unbalanced
3.3 kilohms
Actual
(Internal)
1,000 ohms
140 kilohms
43 kilohms
3.3 kilohms