Shure M675 Manual

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GENERAL
The Shure M675 Broadcast Production Master is de-
signed for use in conjunction with a Shure M67 or
M67-2E Professional Microphone Mixer, M63 Audio
Master, or SE30 Gated Compressor/Mixer. The com-
bination of the two units provides a complete, compact
console permitting mixing of a number of microphones,
high level sources (such as tape or tape cartridge or
cassette machines) and turntables. By making an in-
ternal jumper change, the two phono inputs may be
used for tape head or high impedance microphone
inputs.
The M675 is not a complete mixer in itself. It may be
thought of as two separate sections: a four-input mixer,
and a monitor amplifier and speaker. The mixer sec-
tion adds four more inputs to the M67, M63 or SE30.
Two inputs are line level (switchable to "Bridge" or
"Terminate"), and the other two are switchable be-
tween "Phono" (RIAA equalized preamplifier) and
"Bridging" line level.
The primary purpose of the monitor amplifier and
speaker section of the M675 is to allow the operator
to audibly monitor the output of the M67, M63 or SE30.
Note that the output of the associated mixer consists
of its own signals plus those from the M675 inputs.
The M675 speaker reproduces the M67, M63 or SE30
output signal, and the M675 "Monitor" control adjusts
the speaker volume. A second function of the M675
monitor amplifier and speaker is to "cue" or preview
the signals entering the M675 mixer section without
having these signals appear at the M67, M63 or SE30
output. This is accomplished using the "Cue" position
of the appropriate M675 "lnput" control knob.
NOTE: Except as noted, references to M67 refer also
to operation with M63 or SE30.
Features
m Provides a complete compact portable production
console when used with M67 or other Shure Micro-
phone Mixers.
Adds four channels with cue provision, when used
with the M67.
Powered by either internal batteries (popular 9V
type) or by M67. Can also provide battery voltage
for powering M67.
Operator can hear program material at a reduced
level during cuing.
Wide flat frequency response and low distortion.
Extremely low noise and RF susceptibility.
Four balanced line inputs with individual gain con-
trols.
Two line inputs switchable to magnetic phono inputs
(RIAA equalization).
Copyright 1976, Shure Brothers Inc.
27A1336 (PJ)
Convertible line inputs are switchable at front panel.
Two line inputs are switchable between high im-
pedance, bridging, or 600-ohm terminating.
Front-panel 600-ohm headphone output jack for
program monitor and cue. Rear panel headphone
output jack for program monitor.
External &ohm speaker output jack for monitoring
program and cue, with provision for external muting.
Internal monitor speaker for program and cue.
All connections are phase-matched to M67.
Compact, lightweight.
Stacking hardware included for mounting M675 to
M67.
SPECIFICATIONS
Frequency Response:
Program Channel (measured at M67 output):
phono: t 2 dB of standard RIAA
line: +2 dB, 30-20 kHz
Monitor Channel: response tailored to - 5 dB @ 40 Hz,
- 3 dB @ 15 kHz.
Gain at 1 kHz:
A. Program Channel:
Mix Bus Output
Input
(with 3.5k load) M67 Output
Phono + 1 3 . 5 & 2 d B + 8 3 . 5 - + 2 d B
Line 1, 2 - 2 9 k 2 dB + 4 1 t 2 dB
Line 3 , 4 bridge - 2 9 f 2 dB +41 * 2 dB
Line 3, 4 terminate - 3 5 t 2 dB +35 t 2 dB
NOTE: Gain to Mix Bus output will b e approximately 13 dB higher
than shown above if loaded with high impedance (50k).
B. Monitor Channel (to &ohm speaker output loaded
with 8 ohms):
Input Condition Gain
Headphone cable
(from M67) No pots in cue
+
13 t 2 dB
Phono This hput only +49 +-2 dB
in cue"
Line 1 or 2
R
+7.5 +-2 dB
Line 3 or 4, bridge
,I +7.5 +-2 dB
Line 3 or 4, terminate
,t +1.5 f 2 dB
NOTE: Monitor channel gain to 600-ohm output loaded
by 600 ohms is 19 dB higher than gain shown
in above table.
NOTE: Connections of M675 to M67 will reduce gain
on M67 inputs by 3 dB.
Printed in U.S.A.