User guide

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MODEL M367 AND M367E MICROPHONE MIXERS

The Shure Model M367 is a six-input, portable microphone

mixer/remote amplifier specifically designed for professional ap-

plications in electronic news gathering (ENG), electronic field

production (EFP) and general audio mixing. It sets a new stan-

dard for portable mixer performance and features. Exceptionally

low–noise design makes the M367 ideal for use with digital trans-

mission links and digital video/audio recording media, including

ISDN and DAT. Compact and rugged, the M367 is built to with-

stand the most demanding field production conditions. In addi-

tion, its excellent performance, versatility and features make it an

ideal choice for studio, remote, or sound reinforcement use, and

as an add-on mixer for expanding existing facilities.

Each M367 handles up to six microphones or line-level sig-

nals. Any high-quality, low-impedance, balanced microphone

using a dynamic or condenser* transducer (including wireless

and shotgun types) can be used. Additional M367 or other Shure

mixers can be linked using the rear–panel mix bus jacks.

The M367 is supplied with rubber feet, detachable power cord,

and spare power line fuse. Model A367R is an optional rack

mount kit enabling the M367 to be mounted in a standard 483

mm (19–inch) audio equipment rack (two rack units).

The M367 is supplied for operation at 100–120 Vac, 50/60 Hz,

and the M367E for operation at 220–240 Vac, 50/60 Hz. Each

model is internally switchable to the other’s operating voltage

range.

*Self-powered or operable on 12 or 48 Vdc phantom power.

Features

 Exceptionally quiet design, suitable for use with DAT, record-

able CD, and other digital formats

 Extended frequency response of 20 Hz to 20 kHz

 Dynamic range greater than 100 dB

 Transformer–balanced inputs and outputs for superior rejec-

tion of RFI and electromagnetic hum

 Six selectable mic/line inputs

 Selectable mic/line output and dedicated line output

 Metal XLR input and output connectors

 Wide–range input gain controls handle hot signal levels with-

out attenuators

 48 V or 12 V phantom power for condenser microphones

 Switchable low-cut filters on each input

 Peak indicator LED on each input

 Professional mechanical VU meter—LED backlighting for

high reliability, no lamp replacement

 Bi–color output LED shows output limiting and peak indication

 Output peak limiter with switchable threshold

 1 kHz tone oscillator

 Mix bus jack to link M367s or other mixers

 Balanced Mix Bus connection to other M367s

 Monitor input via Phones push/pull control

 Headphones volume control

 1/4” and 3.5 mm jacks for stereo headphones

 Customized operation via internal DIP switches, trim pots, and

optional alternate wiring

 Regulated voltage rails (±15 Vdc) provide exceptional head-

room

 Power-on LED

 Battery check switch and low battery warning indication

 AC power operating range from 100 to 120 volts, 50/60 Hz or

220–240 Vac, 50/60 Hz

 Soft-touch, color-coded control knobs with raised position indi-

cators

 Rugged all metal chassis with protective end caps

 Detachable ac power cord

 Backup/field operation powering with two 9–volt batteries

 Automatically and silently switches to battery operation should

ac voltage fail

 Designed and manufactured in U.S.A. with legendary Shure

reliability and performance

IF YOU’VE USED THE M267...

Your new M367 mixer contains numerous features and im-

provements not found in the M267 model. If you don’t have the

time or inclination to read this informative data sheet, these fea-

tures are identified in the box below. You will then be familiar with

the most important new capabilities of your M367.

Output peak/limiter LED

Selectable mix bus, balanced for M367s

12–, 48–volt phantom power

Input clipping LEDs

Detachable power cord

Two XLR outputs

Side battery compartment

Power–on LED

Headphones monitor circuit

Adjustable limiter threshold

Meter LED backlighting

VU lamp mode selector

Monitor input sensitivity selector

Program/monitor input selector

•

Model M367 AND M367E User Guide

27A8511 (TG)

2000, Shure Incorporated

Printed in U.S.A.

Summary of content (10 pages)

PAGE 1
Model M367 AND M367E User Guide MODEL M367 AND M367E MICROPHONE MIXERS Professional mechanical VU meter—LED backlighting for high reliability, no lamp replacement Bi–color output LED shows output limiting and peak indication Output peak limiter with switchable threshold 1 kHz tone oscillator Mix bus jack to link M367s or other mixers Balanced Mix Bus connection to other M367s Monitor input via Phones push/pull control Headphones volume control 1/4” and 3.
PAGE 2
(6 dB below clipping). If the limiter is switched on, the LED illuminates green to indicate limiter operating threshold has been reached. The LED will still illuminate red if the preset peak level is reached before the limiter activation point is reached. 7. Battery Check Switch: When pressed, the status of the two 9V batteries is indicated on the VU meter: an indication in the red portion of the scale indicates adequate battery power. When the meter reads 0 VU, the batteries are at about 13.5 volts.
PAGE 3
1 2 3 4 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ Á ÁÁÁÁÁÁ ÁÁ ÁÁ Á Á ÁÁÁ Á ÁÁÁÁÁ ÁÁÁ Á Á ÁÁ Á ÁÁ Á Á ÁÁÁ ÁÁ Á Á ÁÁÁÁ ÁÁÁ Á Á ÁÁÁ Á Á ÁÁÁ Á Á ÁÁ Á Á Á Á Á Á ÁÁÁÁ ÁÁ ÁÁ ÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁ Á Á Á ÁÁÁÁÁÁÁÁ Á Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁ ÁÁÁ ÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ ÁÁ Á Á ÁÁÁÁÁÁÁÁ Á MIC LINE PHANTOM MIC LINE 100/120 VAC 50/60 Hz 100 mA OFF LINE SPARE LINE MIC LINE MIC LINE MIC LINE MIC LINE LEVEL M267 M367 ON MONITOR IN 6 OUTPUT 9 MIC 8 5 4 INPUT 7 3 2 1 6 REAR PANEL C
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NOTE: This unit is not disconnected from the mains supply when the Power switch is off. Remove the power connector from the ac source when the mixer is not in use. (MIXER SIDE VIEW) BATTERY COMPARTMENT (right side of mixer) 1. Battery Compartment: Holds two 9–volt batteries. Two fresh 9–volt alkaline batteries will power the unit for at least eight hours under normal conditions.
PAGE 5
pressed again. (Note that this mode will drain batteries faster than the Timed mode.) WARNING The headphones circuit is capable of producing high volume levels that can damage the user’s hearing. Make sure the headphones volume setting is low (full CCW) before putting the headphones on. 3. If greater clearance for the Input Channel 1 Gain knob is desired, the left end cap can be removed, rotated 180°, and replaced.
PAGE 6
Phantom Power 12 V Phantom: 12 V through 340 Ω 48 V Phantom : 48 V through 3.4 kΩ Inputs Input IMPEDANCE Designed Actual for Use With (Internal) Input Clipping Level Mic 19 to 600 Ω 1 kΩ –10 dBV +36 dBV Line ≤10 kΩ 50 kΩ Monitor ≤1 kΩ 13 kΩ 0 dBV Mix Bus (M367) 930 Ω bal.; 1860 Ω unbal. 930 Ω bal.; 1860 Ω unbal. +23 dBV Mix Bus (M267) 3.5 kΩ 3.5 kΩ –17 dBV Mixer Power AC.
PAGE 7
INTERNAL ADJUSTMENTS WARNING All internal modifications must be performed by qualified service technicians. WARNING All internal adjustments must be performed by qualified service technicians. Disassembling the M367 1. Remove the mixer top cover as described above. NOTE: All internal adjustments require only removal of the top cover. 1. Remove battery compartment. 2. Carefully remove three multi–pin cable assembly connectors from upper front PC board (nearest front panel).
PAGE 8
Changing Low–Cut Filter Corner Frequency (3 dB down point) A. To decrease corner frequency: 1. Calculate new capacitor value for lower low–cut corner frequency.
PAGE 9
Master Gain Remote Control Note: This modification will disable both the M367’s monitor function and its front–panel Master gain control, 1. Locate resistor R641 (near Monitor In jack J863) and remove it. 2. Locate resistor R746 (near Master potentiometer R706) and remove it. 3. Locate empty pad X702 (near Master potentiometer R706). Solder one end of a 100 Ω, 1/4 W resistor in the hole of X702. Solder an insulated wire to the other end of the 100 Ω resistor. Locate empty pad X644 (near jack J863).
PAGE 10
APPENDIX Changing Limiter Threshold Presets: Samples Calculations For the following limiter thresholds: Limiter Threshold DIP Switch S701 Requiv Position 2 Position 3 — dBm — up up high 12 105 kΩ=R1 down up med. high 8 62 kΩ=R2 up down med. low 4 35 kΩ=R3 down down low 0 18 kΩ=R4 1. Obtain a 105 kΩ, 1/4 Ω, 1% resistor and solder it to the holes of X732. 2. 1 R5 = 1 1 62,000 105,000 = 151.4 kΩ Obtain a 150 kΩ, 1/4 W, 1% resistor and solder it to the holes of X733. 3.