Advertisement
Quick Links
222 HARTREY AVE
.
EVANSTON, I L 60204 U S A
MICROPHONES AN0 ELECTRONIC COMPONENTS
1
: / E T
MODEL M68P
@
A R E A C O D E 3 1 2 / 3 2 8 9 0 0 0
CABLE SHUREMICRO
MICROPHONE MIXER
I
GENERAL
The Shure Model M68P is a five-channel, completely
transistorized, portable microphone mixer for use with
sound reinforcement, tape recording and audio-visual
systems.
The Mixer features:
w
A high-impedance (unbalanced) microphone level
output.
Four microphone inputs for high-impedance (un-
balanced) microphones.
m
One high-level auxiliary input suitable for tape,
tuner, and accessories such as the A68P Phono
Preamplifier.
Individual volume controls to balance each of the
five inputs.
w
A master volume control to simultaneously con-
trol level of all inputs.
w
A low-impedance (balanced or unbalanced) rni-
crophone level output.
A high-impedance, high-level auxiliary output.
A dc power supply jack. This jack supplies 28
volts dc for use with accessories such as the
Model A68P Phono Preamplifier or M62V Level-
Loc or it may be used as power input in connec-
tion with the Model A67B Battery Power Supply
(Accessory).
A facilitv for connectina two or more mixers to-
gether i o obtain addithnal microphone inputs.
For example, two mixers connected together will
give a total of eight microphone inputs and one
auxiliary input.
Listing by Underwriters' Laboratories Inc. and
listing by Canadian Standards Association as
certified.
SPECIFICATIONS
Gain
At 1,000 Hz
OUTPUTS
INPUT
Mic.
Mic.
Microphone
5 mV
produces
Auxiliary
50 mV
produces
Frequency Response
Flat within + 3 dB from 40 Hz to 20,000
Hz
Hum and Noise
70 dB below rated output (Aux. Output)
Equivalent lnput Noise
33 kilohm source, 103 dB below 1 volt
Impedance
' v
INPUT
DESIGNED
FOR
USE
WITH
ACTUAL IMPEDANCE
-
-
;
Microphone
Unbalanced 10 to 50
60 kilohms
kilohm microphones
Auxiliary
100 ohm to 10 kilohm
40-70 kilohms*
unbalanced high-level
sources
Copyright 1972, Shure Brotherj Inc.
27A545 (NG)
OUTPUT
DESIGNED FOR USE WITH
ACTUAL IMPEDANCE
Low Imp.
Mic.
Balanced or unbalanced
150-300 ohms*
25 to
600
ohm
microphone-level circuits
High Imp. Mic. Unbalanced 10 to 50
30-40 kilohms*
kilohm microphone-level
circuits
Auxiliary
Unbalanced high-imped-
2.5-3 kilohms*
ance (10 kilohms or
greater) auxiliary circuits
* Depending upon control settings
Distortion
Less than 1 % total harmonic distortion when low-
impedance microphone output is at 20 mV level,
high-impedance microphone output is at 200 rnV
level, and auxiliary output is at 2.0 volt level.
Phase
All microphone inputs and outputs are in phase.
Auxiliary input and output are out of phase with the
microphone inputs and outputs.
Clipping Levels, Minimum
Input
Clipping Level
Microphone
450 mV
Output
Clipping Level
Microphone, High Imp.
850 mV
Microphone, Low Imp.
60 rnV
Auxiliary
4 volts
Operating Voltage
108-132 volts, 50160 Hz, 3 watts
D.C. Operation
28 volts dc a20%, 5 mA
Dimensions
See Figure
A
Overall
Dimensions
:;;;";,
FIGURE A
Net Weight
1.25 kg (2% Ib)
INSTALLATION
Connection Between Mixer and Components
For balanced-line microphone level output connec-
tion, use two-conductor, low capacity shielded cable.
For unbalanced (high-impedance) microphone level or
auxiliary high-level output connection, use single-con-
ductor, low capacity shielded cable.
Printed in U.S.A.
Advertisement
