Shure M367 User Manual 2

SIX CHANNEL MICROPHONE MIXER

Model M367 User Guide

DESCRIPTION

The Shure M367 is a portable, six–input, two-output (mono), battery-powered microphone and line level mixer/preamplifier. Its transformer–isolated design, low-noise performance, and compact and rugged construction make the M367 an ideal choice for studio and mobile broadcast, electronic news gathering (ENG), and electronic field production (EFP) applications.

This versatile mixer can also be used for the following:

• Digital transmission links

• Digital video/audio recording media (ISDN, hard disk recording, and DAT)

• Sound reinforcement

The M367 comes with rubber feet, detachable power cord, and spare power line fuse. It can be rack mounted using the optional Model A367R rack mount kit.

FEATURES

• Six selectable mic/line inputs

• Selectable mic/line output and dedicated line output

• Transformer-balanced inputs and outputs for sup erior

of RFI and electromagnetic hum

• Professional mechanical VU meter–LED backlighting for high

reliability, no lamp replacement

• Headphone monitoring 3.5 mm, (1/4 in.)

• Output peak limiter with switchable threshold and bi-colored

LED indicator

• Peak indicator LED, and switchable low-cut filters on each

1/4 in. return monitor input

• AC power or (2) 9V battery operation

rejection

input

ADDITIONAL FEATURES

• 48 Vdc or 12 V phantom power for condenser microphones

• 1 kHz tone oscillator

• Mutes all input channels when activated

• Tone level control is on the master

• Wide–range input gain controls handle ho t signal levels attenuators

• Customized operation via internal DIP switches, trim pots, and optional alternate wiring

• Battery check switch and low battery warning indication

• Power-on LED

• Input expansion via mix bus jack to link M367s or other mixers

• Rugged all metal chassis with protective end caps

• Detachable AC power cord

without

C8511 (Rev. 4)

Printed in U.S.A.

FRONT PANEL CONTROLS AND INDICATORS

2 3

PEAK

543

FRONT PANEL CONTROLS AND INDICATORS

FIGURE 1

1. Input Gain Control: For best performance, adjust each Input

Gain Control so the associated Input Peak LED illuminates red only on the loudest signal peaks.

2. Input Low-Cut Filter Switch: Provides low-frequency roll–off

to reduce wind noise and rumble. When using the filter, the frequency response is down 7 dB at 150 Hz. Roll-off slope is 6 dB per octave.

3. Input Peak LED: Illuminates at 6 dB below clipping.

4. Limiter Switch: Activates a fast-acting, peak-responding

limiter optimized for speech. An internal modification can provide a slower release time for music signals (see DIP Switches).

5. Output Peak/Limiter Bi-Color LED:

8 9

1kHz TONE

OFF ON

PEAK

OFF ON

-20

LIMITER

MASTER

PEAK

+12

M367

9. Power-On/Off Switch: Turns the mixer on and off.

10. Power-On LED:

Green = power on

Flashing =

low batteries (about 30 minutes of operation remaining)

11. Dual function control knob:

Headphones Gain Control: Rotate to adjust headphone level. Pull/Monitor Switch: When using headphones, pull out to listen to audio from the MONITOR IN jack. Add attenuated program signal using DIP switch 4 (see DIP Switches).

BATT

CHECK

PULL/MONITOR

POWER

PHONES

Red = output signal at +12 dBm

(6 dB below clipping)

Green = output signal at limiter threshold

(when limiter is on)

6. Output Level (VU) Meter: Meter response approximates true

VU characteristics (about 300 ms rise and fall, 1% to 5% over shoot). For a slower response, see Internal Modifiable Func-

tions. 0 VU is switchable between +4 and +8 dBm (see DIP Switches). When using batteries, use the BATT CHECK

switch to illuminate the meter.

7. 1 kHz Tone Oscillator Switch: Sends a 1 kHz tone to all out-

puts and mutes all inputs. The MASTER control adjusts tone level.

8. Battery Check Button: Press and hold to show battery level

on the VU meter. Press once to illuminate the VU meter for 10 seconds, or set DIP switch 6 to toggle the meter light (see DIP Switches).

WARNING

The headphones circuit can produce high volume levels that can damage the user’s hearing. Make sure headphone volume setting (PHONES) is low (Full CCW before putting headphones on.

12. Headphones Outputs: Stereo 1/4 in. and 3.5 mm phone

jacks.

13. Master Gain Control: Sets mixer output gain. Set to 0 dB

position for unity gain.

REAR PANEL CONNECTORS AND CONTROLS

FIGURE

1. Mic/Line Level Output Switch: Sets output to microphone or line level.

2. Phantom Power Switch: Adds 12-volt phantom power to all inputs set to MIC. Use DIP switch 7 to increase voltage to 48 volts (see DIP Switches).

3. Mic/Line Level Input Switches 1-6: Sets input to microphone or line level. Phantom power is disabled for inputs set to LINE.

4. M267/M367 Mix Bus Level Switch: Set to M267 when connecting to a SHURE M267, FP42, FP51, M67, or SE30. Use the M367 setting with another M367 or SHURE FP32A.

IMPORTANT

Unless required, leave the mix bus LEVEL switch in the M367

position. The M267 setting may increase mixer out-

t noise up to 30 dB, depending on the MASTER output

pu setting.

5. Mix Bus Jack: Allows you to connect the M367 to another mixer. The mix bus connection is "two-way" and pre-master. When two M367 mixers are connected, all 12 inputs appear at both mixers' outputs. The MASTER gain control of either M367 can be adjusted without affecting the other mixer’s output.

The output level of each M367 mixer drops by 6 dB when connected through the MIX BUS, increase the Master Gain to compensate.

For a balanced mix bus connection between two M367s, use a mix bus cable with two 1/4 in. stereo (tip, ring, sleeve) plugs. When connecting other types of Shure mixers, construct a mix bus cable with a 1/4 in. mono phone plug (tip = signal, sleeve = ground) and the appropriate connector for the other mixer's mix bus jack (see Figure 3).

NOTE

BALANCED

TO M367 #1 TO M367 #2

UNBALANCE

TO M367 TO M267

MIX BUS CONNECTIONS

FIGURE 3

6. Channel Inputs: These female XLR inputs are transformerbalanced to provide superior rejection of hum, RFI, and other interference.

7. Monitor In Jack: Accepts mono line-level signals (tip = signal, sleeve = ground) for "tape return" or a communications channel input. See Pull/Monitor switch description.

You can also modify the MONITOR IN jack to accept a stereo

input and provide a stereo sum monitor signal (see Internal Modificable Functions ).

Mixer Output:

The Line output is preset to line level, but can be modified to a true

output impedance or changed to microphone level (see Inter-

600 nal Modifiable Functions ).

9. Power Connector: See AC Operation .

10. Time Delay Fuses: The slide-out compartment contains two power line fuses. The outer (toward you) is a spare.

M367: 0.125A, 250V fuse M367E: 0.063A, 250V fuse

For continued protection against fire, replace with the same type and rating of fuse.

These male XLR outputs are transformer-balanced.

WARNING

N.C.

AC OPERATION

Limiter Threshold

= +16 dBm

= +8 dBm = +4 dBm = 0 dBm

Use the supplied power adapter to connect the M367 to a power

outlet.

M367: 100-120 VAC, 50/60 Hz M367E: 220-240 VAC, 50/60 Hz

The operating voltage can be switched internally (see Internal

Modifiable Functions).

NOTE

Appliance inlet is the main disconnect device (to power off the

M367, you must unplug the power supply).

BATTERY OPERATION

Open the battery compartment by grasping the sides of the compartment, squeezing to release the locks, and pulling the compartment outward. Insert two 9-volt batteries.

During battery operation, use the BATT CHECK button. Press and hold to show battery level on the VU meter. Press once to illuminate the VU switch for 10 seconds, or set DIP switch 6 for continuous illumination (see DIP Switches).

BATTERY LIFE

With two fresh 9-volt alkaline batteries, the M367 operates for about eight hours. Some mixer features decrease battery life, as illustrated in the following table.

SETTING LEVELS

1. Set the MASTER gain knob to the full off position.

2. Activate the 1 khz tone oscillator by setting the 1 KHZ TONE switch to ON. Adjust the MASTER gain until the VU meter needle indicates "0". Adjust the input levels on the equipment connected to the M367 outputs accordingly. Deactivate the tone by setting the 1 KHZ TONE switch to OFF.

3. Adjust the Input gain controls based on the incoming signal levels. The input PEAK LEDs should flicker red only on loud input peaks.

4. Observe the output on the VU meter and adjust the MASTER gain to obtain the desired levels. try to keep the average levels around "0 VU". The PEAK LED adjacent to the VU meter should illuminate only on loud output peaks.

DIP SWITCHES

234567

Access the DIP switches by removing the battery compartment

and top cover. Use the following table to set the switches (Bold = factory setting.)

S701

Momentary use of headphones or meter illumination will not appreciably affect battery life.

Mixer Operation Battery

No Signal 40 9

With +4 dBm continuous output 45 8

With six mics at 12 V phantom power 55 6.5

With six mics at 48 V phantom power 70 5

With output to headphones 50 7

With meter illumination continuously on 75 4.5

*until Power LED begins to flash, allowing approximately 30 minutes to replace batteries.

NOTE

Current

(mA)

Battery

Life

(hours)*

CONNECTING M367 OUTPUTS TO TELEPHONE LINES

Use the XLR outputs at line level to drive dc-biased, "dialed up" telephone lines. A slight increase in distortion may occur. Use the M367 limiter with the limiter threshold set to +4 dBm. Modify the M367 output impedance to 600 W for proper fidelity (see Internal Modifiable Functions). When connecting the M367 to a telephone line, you must use an FCC-Registered interface adapter between the mixer and telephone line.

Function Up

Switch

1 Meter 0 VU 0 VU = +4 dBm 0 VU = +8 dBm

2 Limiter

Threshold

4 Program to

Monitor

5 Monitor In

Gain

6 VU Lamp (Batt

Check button)

7 Phantom

Power

Normal High

Timed (Turns off

after 10 seconds)

12 Vdc 48 Vdc

See Figure 4

Off On (adds attenu-

Down

ated program signal

in headphones with

Pull/Monitor switch

on)

Toggled (press on,

press off)

LIMITER THRESHOLD SETTINGS

FIGURE 4

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