Shure M68 User Manual

OPTIONAL ACCESSORIES
Battery Power Supply
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Cable Kit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locking Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phono Preamp
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rack Panel Kit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stacking Kit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interconnecting Cable
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attach6 Case ..........................................................................................
Model A68B
Model A68C
Model A68L
Model A68P
Model A68R
Model A68S
Model A68SC
Model AC68
SPECIFICATIONS
Gain: At 1,000 Hz. (cps).
o u t p u t s
Low Imp. High Imp. High Imp.
Input Mic. Mic. Aux.
Low Imp. Mic. f 9 d b +33 db +60 db
.5 mv produces 1.4 mv 22 mv 500 mv
High Imp. Mic. -13 db f l l d b 4-38 db
5 mv produces 1.1 mv 18 mv 400 mv
AUX. -35 db -11 db f 1 6 d b
50 mv produces
0.9
mv 14 mv 320 mv
ii3f8
1 2 8 8 9 m m l - I
I
n
I
u -
---
- \
1 -
I V
-
--$32 aPPnoxU
U J
( 5
5mm)
O V E R ALL DIMENSIONS
-
FIGURE B
Frequency Response: The frequency response is flat & f : b from ,30 Hz. (cps)
to 20,000 Hz. (cps)
.
Hum-Noise:
Equivalent I n p u t Noise: 150 ohm source, 123 db below 1 volt.
I n p u t Impedance: Microphone inputs suitable for high or low impedance dynamic
and ribbon microphones. Auxiliary-50,000 ohms.
Recommended Load Impedance:
2 f L O
7
70 db below rated output.
Low Impedance Microphone
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25 to 600 ohms
High Impedance Microphone
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20,000 ohms or greater
Auxiliary High Impedance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50,000 ohms or greater
Distortion: Less than 1
%
total Harmonic Distortion when low impedance micro-
phone output is a t 20 mv level, high impedance microphone output is a t 200 mv
level, and Aus. high impedance output is a t 2.0 volt level.
O u t p u t Clipping Level:
o u t p u t Min. Clipping Level
Mic. Low Impd. 60 mv
Mic. High Impd. .85 volts
Aux. High Impd.
4.0 volts
Operating Voltage
:
Model M68: 105-130 volts 50/60 cycle
Models M68-2 and M68-2E: 105-130 volts 50/60 cycle or 210-240 volts 50/60
cycle.
Case: Painted Metal.
Dimensions: See Figure B.
Net Weight: 4 pounds.
27A477 ( I 1-67)
Copyright
1967,
Shure Brothers, Inc.
2 2 2 H A R T R E Y A V E E V A N S T O N , I L L . ( 6 0 2 0 4 ) U . S . A .
A R E A C O D E 3 1 2 / 3 2 8 - 9 0 0 0
'
C A B L E S H U R E M I C R O
MODELS M68, M68-2, AM) M68-2E MICROPHONE MIXERS
lk I?
*'?
General: T h e Shure Models M68, M68-2, and M68-2E are five channel, completely
transistorized, portable microphone mixers for use with public address systems and tape
recorders.
The Mixers Feature:
Four microphone inputs with individual slide switches mounted on rear panel
for selection of low impedance (balanced or unbalanced) or high impedance
(unbalanced).
One high level auxiliary input suitable for tape, tuner, and accessories.
Individual volume control to balance each of the five inputs.
*
A master volume control to simultaneously control level of all inputs.
*
A high (unbalanced)
or
low impedance (balanced or unbalanced) microphone
level output. Impedance selected with slide switch to match the microphone
input of associated amplifier.
*
A high impedance 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
it may be used as power input
in connection with the Model A68B Battery Power Supply (Accessory).
*
A facility for connecting two or more mixers together to obtain additional
microphone inputs. For example, two mixers connected together will give a total
of eight microphone inputs and one auxiliary input.
0
U.S. Underwriters Laboratory approval for use in commercial applications.
(Applies to Model M68 and M68-2).
INSTALLATION
:
CONNECTION BETWEEN COMPONENTS
For balanced-line connection use two conductor, shielded, low capacity cable for
connections. For unbalanced (high impedance), use single conductor, shielded, low
capacity cable for connections.