Shure m675 mix

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a PROFESSIONAL PRODUCTS DATA

222 HARTREV AVE., EVANSTON, |L.

$0204 u.s.At - AREA coDE 312/328-9000 o CABLE: SHUREMICRO

GENERAL

The Shure M675Broadcast Production Master is de-
signed for use in coniunction 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 Input control knob.

NOTE: Except as noted, references to M67 refer also
to operation with M63 or SE30.

Features

I Provides a complete compact portable production
console when used with M67 or other Shure Micro-
phone Mixers.

I Adds four channels with cue provision, when used
with the M67.

I Powered by either internal batteries (popular 9V
type) or by M67. Can also provide battery voltage
for.powering M67.

I Operator can hear program material at a reduced
level during cuing.

I Wide flat frequency response and low distortion.

I Extremely low noise and RF susceptibility.

I Four balanced line inputs with individual gain con-
trols.

I Two line inputs switchable to magnetic phono inputs
(RIAA equalization).

Copyright [776. Shun Brothers Inc.
27A652 (PF)

I Convertible line inputs are switchable at front panel.

I Two line inputs are switchable between high im-
pedance, bridging, or GOO-ohm terminating.

I Front-panel 600-ohm headphone output jack for

program monitor and cue. Rear panel headphone

output jack for program monitor.

External 8-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.

fiacking hardware included for mounting M675 to
67.

SPECIFICATIONS
Frequency Response:
Program Channel {measured at M67 output):
phono: :2 dB of standard RlAA
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 +13.5 :2 dB +835 :2 dB
Line1.2 -29 i2 dB +41 i2 dB
Line 3.4bridge -29 :2 dB +41 :2 dB
Line 3,4terminate -35 :2 dB +35 12 dB

NOTE: Gain to Mix Bus output will be approximately 13 dB higher

than shown above if loaded with high Impedance (50k).

B. Monitor Channel (to B-ohm speaker output loaded
with 8 ohms):

Input Condition Gain

Headphone cable

(from M67) No pets in cue +13 :2 dB

Phone This input [only +49 :2 dB
in cue

Line 1 or2 " +7.5 i2 dB

Line 3 or 4, bridge " + 7.5 :2 dB

Line 3 or 4, terminate +1.5 :2 dB

NOTE: Monitor channel gain to SOD-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.

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209 mm (ll-SIB IN.)

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Noise:

Phono: measured at Mix bus output, at least 71 dB
below 10 mV input, 20-20 kHz. Measured at M67
output, noise depends upon M67 master gain control.
With M67 master gain at 51/2" (-20 dB) noise output
of M67 will be -50 dBv maximum.

Line: will not add to noise of M67.

Distortion:

Program Channel: (measured at Mix Bus output)
Phono: Less than 1% THD with input level of 35 mV,
30 Hz-20 kHz.

Line: Less than 1% THD with input level of
+18 dBm, 30 Hz-20 kHz.

Monitor Channel: measured at B-ohm speaker output
with 8-ohm load. Less than 1.6% THD with output level
of .56 volts to 8 ohms (40 mW) 100 Hz-15 kHz. Less
than 2% THD with level of .31 volts at 40 Hz.

Control Interaction:
Under 11/: dB with any control combination.

Inputs:
Impedance
Input Designed Ior Actual Input
Use With (Internal) Clipping
Phono Magnetic 25 kilohms 90 mV
phono +350 pF
cartridges
Line Bridging Less than 75 kilohms Over +16
10 kilohms 110% dBV
(6.3 VRMS)
Llne Terminated 600 ohms 600 ohms Over +18
110% dBM
(6.3 VRMS)
Monitor Input M67 head- 1000 ohms Over +13
(via headphone phone 120% dBV
plug) jack (2.5 VRMS)
Corresponds
to +18 dBM
output from
M67

NOTEtThe input impedance is set (or 25k which is the correct load
(or I stereo cartridge operating with the L at R channels
parallel (monophonic mode). It an Input impedance of 47k is
desired, the 47k resistors (R226, R227) across the phona input
incite may be removed.

Minimum Common Mode Rejection:
80 dB with line input of 10 volts at 100 Hz.

\_/
F-5.t') mm
(7/32 INJ
Outputs:
I edanc
mp e Output
Designed For Actual Clipping
Output Use With (Internal) Level
Mix Bus M67 Mlx Bus 13 kilohms -
(3.5K load) i20%
or higher
Front-Panel 600 ohms or 70 ohms +17 dBV
Headphone Jack greater :10% (7 VRMS)
Rear-Panel Low 5 kilohms Same
Headphone Jack 1-20% as
High 1.1 kilohms M67
(See :20%
"Head-
phone
section)
8-ohm Speaker 8 ohms or 4 ohms max. - ZdBV
Output greater (0.3 V:
80 mW)

Overload and Shorting Protection:

Shorting the outputs will produce no damage. Overload
of phone inputs up to 3 volts will produce no damage.

Operating Voltage:

27 Vdc nominal supply from either internal supply
comprised of six 9V type 216 batteries or from the
associated M67 or M63 Audio Master. Minimum supply
is 21.5 Vdc; maximum is 35.0 Vdc.

Weight:

Without batteries: 2.38 kg (5 lb, 4 02)
With batteries: 2.61 kg (5 lb, 12 oz)

CONTROLS, CONNECTIONS
AND OPERATION

CONNECTIONS (T0 M67, M63 OR SE30)

Stacking hardware is included for mounting the M67
or M63 on top of the M675. See installation instruc-
tions for the A688 Stacking Kit provided in the data
sheet covering mixer and circuitry accessories. The
stacking kit is not used with the SE30. The plug on
the Headphones" output cable at the rear of the
M675 is inserted fully into the M67, M63 or SE30
Headphones jack. The phone-type plug on the Mix
Bus cable at the rear of the M675 is inserted into the
Mix Bus jack on the M67 or SE30, or High Level Input
of the M63. The red and black 30 VDC" wires at the
rear of the M675 should be connected to the 30 Vdc
connectors on the M67, M63 or $530. If rack mounting
is desired, the M67 and M675 can each be mounted in
A68Ft rack mount accessories. The connecting cables
on the M675 are of sufficient length to reach the M67
in this case.