Shure Clothes Dryer M367 User Manual

Model M367 User Guide  
SIX CHANNEL MICROPHONE MIXER  
! IMPORTANT SAFETY INSTRUCTIONS !  
1.  
2.  
3.  
4.  
5.  
6.  
7.  
READ these instructions.  
KEEP these instructions.  
HEED all warnings.  
FOLLOW all instructions.  
DO NOT use this apparatus near water.  
CLEAN ONLY with dry cloth.  
DO NOT block any ventilation openings. Install in accordance with the manu-  
facturer's instructions.  
DO NOT install near any heat sources such as radiators, heat registers, stoves,  
or other apparatus (including amplifiers) that produce heat.  
DO NOT defeat the safety purpose of the polarized or grounding-type plug. A  
polarized plug has two blades with one wider than the other. A grounding type  
plug has two blades and a third grounding prong. The wider blade or the third  
prong are provided for your safety. If the provided plug does not fit into your out-  
let, consult an electrician for replacement of the obsolete outlet.  
USE only with a cart, stand, tripod, bracket, or table  
specified by the manufacturer, or sold with the  
apparatus. When a cart is used, use caution when  
moving the cart/apparatus combination to avoid  
injury from tip-over.  
12.  
13. UNPLUG this apparatus during lightning storms or when unused for long periods of  
time.  
14. REFER all servicing to qualified service personnel. Servicing is required when the  
apparatus has been damaged in any way, such as power-supply cord or plug is dam-  
aged, liquid has been spilled or objects have fallen into the apparatus, the apparatus  
has been exposed to rain or moisture, does not operate normally, or has been  
dropped.  
8.  
9.  
15. DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled  
with liquids, such as vases, on the apparatus.  
16. The MAINS plug or an appliance coupler shall remain readily operable.  
17. The airborne noise of the apparatus does not exceed 70dB (A).  
18. Apparatus with CLASS I construction shall be connected to a MAINS socket outlet  
with a protective earthing connection.  
10. PROTECT the power cord from being walked on or pinched, particularly at plugs,  
convenience receptacles, and the point where they exit from the apparatus.  
11. ONLY USE attachments/accessories specified by the manufacturer.  
19. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or  
moisture.  
20. Do not attempt to modify this product. Doing so could result in personal injury  
and/or product failure.  
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 input  
1/4 in. return monitor input  
AC power or (2) 9V battery operation  
DESCRIPTION  
The Shure M367 is a portable, six  
battery-powered microphone and line level mixer/preamplifier. Its  
transformer isolated design, low-noise performance, and compact  
-input, two-output (mono),  
-
and rugged construction make the M367 an ideal choice for studio  
and mobile broadcast, electronic news gathering (ENG), and  
electronic field production (EFP) applications.  
ADDITIONAL FEATURES  
This versatile mixer can also be used for the following:  
48 Vdc or 12 V phantom power for condenser microphones  
1 kHz tone oscillator  
Digital transmission links  
Digital video/audio recording media (ISDN, hard disk  
recording, and DAT)  
Mutes all input channels when activated  
Tone level control is on the master  
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.  
Wide–range input gain controls handle hot signal levels without  
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  
FEATURES  
Six selectable mic/line inputs  
Selectable mic/line output and dedicated line output  
Transformer-balanced inputs and outputs for superior rejection  
of RFI and electromagnetic hum  
Professional mechanical VU meter–LED backlighting for high  
reliability, no lamp replacement  
©2008 Shure Incorporated  
27C8511 (Rev. 5)  
Printed in U.S.A.  
 
REAR PANEL CONNECTORS AND CONTROLS  
1
2
3
4
LEVEL  
MIC LINE PHANTOM MIC LINE MIC LINE MIC LINE MIC LINE MIC LINE MIC LINE  
OFF ON  
100-120 VAC 50/60 Hz 100 mA  
M267 M367  
LINE  
MONITOR  
IN  
MIX  
BUS  
6
5
4
3
2
1
OUTPUT  
INPUT  
SPARE  
8
9
7
6
5
10  
REAR PANEL CONNECTORS AND CONTROLS  
FIGURE 2  
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 con-  
necting to a SHURE M267, FP42, FP51, M67, or SE30. Use  
the M367 setting with another M367 or SHURE FP32A.  
BALANCED  
TO M367 #1  
TO M367  
TO M367 #2  
UNBALANCED  
N.C.  
TO M267  
MIX BUS CONNECTIONS  
FIGURE 3  
IMPORTANT  
6. Channel Inputs: These female XLR inputs are transformer-  
balanced 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 chan-  
nel input. See Pull/Monitor switch description.  
Unless required, leave the mix bus LEVEL switch in the  
M367 position. The M367 setting may increase mixer out-  
put noise up to 30 dB, depending on the MASTER output  
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.  
You can also modify the MONITOR IN jack to accept a stereo  
input and provide a stereo sum monitor signal (see Internal  
Modificable Functions).  
8. Mixer Output: These male XLR outputs are transformer-balanced.  
The Line output is preset to line level, but can be modified to a true  
600Ω  
output impedance or changed to microphone level (see Inter-  
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  
NOTE  
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).  
M367E: 0.063A, 250V fuse  
WARNING  
For continued protection against fire, replace with the same  
type and rating of fuse.  
3
 
SETTING LEVELS  
AC OPERATION  
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.  
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).  
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.  
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 com-  
partment outward. Insert two 9-volt batteries.  
DIP SWITCHES  
During battery operation, use the BATT CHECK button. Press  
and hold to show battery level on the VU meter. Press once to illu-  
minate the VU switch for 10 seconds, or set DIP switch 6 for con-  
tinuous illumination (see DIP Switches).  
1 2 3 4 5 6 7  
S701  
BATTERY LIFE  
Access the DIP switches by removing the battery compartment  
and top cover. Use the following table to set the switches  
(Bold = factory setting.)  
With two fresh 9-volt alkaline batteries, the M367 operates for  
about eight hours. Some mixer features decrease battery life, as il-  
lustrated in the following table.  
NOTE  
Down  
Momentary use of headphones or meter illumination will not  
appreciably affect battery life.  
Function  
Up  
1
2
Meter 0 VU  
0 VU = +4 dBm  
0 VU = +8 dBm  
Mixer Operation  
Battery  
Current  
(mA)  
Battery  
Life  
See Figure 4  
Limiter  
(hours)*  
Threshold  
No Signal  
40  
45  
55  
70  
50  
75  
9
8
3
4
With +4 dBm continuous output  
With six mics at 12 V phantom power  
With six mics at 48 V phantom power  
With output to headphones  
Program to  
Monitor  
Off  
On (adds attenu-  
ated program signal  
in headphones with  
Pull/Monitor switch  
on)  
6.5  
5
7
With meter illumination continuously on  
4.5  
5
6
7
Monitor In  
Gain  
Normal  
High  
*until Power LED begins to flash, allowing approximately 30 minutes  
to replace batteries.  
VU Lamp (Batt  
Check button)  
Timed (Turns off  
Toggled (press on,  
press off)  
after 10 seconds)  
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 Ω 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.  
Phantom  
Power  
12 Vdc  
48 Vdc  
Limiter Threshold  
= +16 dBm  
= +8 dBm  
= +4 dBm  
= 0 dBm  
2
3
LIMITER THRESHOLD SETTINGS  
FIGURE 4  
4
 
SPECIFICATIONS  
Frequency Response  
Polarity  
20 to 20,000 Hz ± 2.0 dB (channel controls centered)  
Total Harmonic Distortion  
0.25% THD at +4 dBm output, 55 to 20,000 Hz  
Voltage Gain  
Mic/Line In to Mic/Line Out  
Non-Inverting  
Non-Inverting  
Inverting  
Mic/Line In to Phones  
Mic/Line In to Mix Bus (tip)  
Monitor to Phones  
Output  
Non-Inverting  
Inverting  
MixBus  
(M367)  
Mix Bus to Mic/Line Out  
Input  
Line  
Mic  
Phones  
Mix  
Bus  
Overload and Shorting  
(M267)  
Shorted outputs, even for prolonged periods, cause no damage.  
Microphone inputs of up to 3 Vrms cause no damage. Line and  
monitor can withstand signals of up to 30 Vrms.  
Input Peak Indicators  
6 dB below clipping level  
Output Peak Indicator  
Lights red at 6 dB below clipping level  
Output Clipping Level  
+18 dBm at line output into 600 Ω  
Low-Cut Filters  
Low-Z Mic  
87 dB  
40 dB  
103 dB  
66 dB  
27 dB  
(150  
Ω)  
Line  
37 dB  
--  
-11 dB  
--  
53 dB  
12 dB  
26 dB  
15 dB  
-25 dB  
Monitor  
--  
--  
--  
--  
Mix Bus  
(M367)  
10 dB  
-38 dB  
MixBus  
(M267)  
50 dB  
2 dB  
66 dB  
--  
--  
7 dB down at 150 Hz; 6 dB/octave slope (3 dB down at 260 Hz)  
Tone Oscillator  
1 kHz ± 20%  
Limiter  
Inputs  
Threshold: Switchable: 0, +4, +8, +16 dBm  
Attack Time: 1 ms ± 0.5 ms  
IMPEDANCE  
Input  
Designed for  
Use With  
Release Time Constant: 100 ms ± 30 ms  
Input  
Actual  
Clipping  
Level  
(Internal)  
Indicator: Green when limiting by 1 dB or more  
Phantom Power  
Mic  
Line  
19 to 600 Ω  
10 kΩ  
1 kΩ  
-10 dBV  
+36 dBV  
0 dBV  
12 V Phantom: 12 V through 340 Ω  
50 kΩ  
48 V Phantom : 48 V through 3.4 kΩ  
AC Power  
Monitor  
1 kΩ  
13 kΩ  
M367: 100120 Vac, 50/60 Hz, 100 mA  
M367E: 220240 Vac, 50/60 Hz, 50 mA; no-signal current drain  
25 mA  
Mix Bus  
(M367)  
930 Ω bal.;  
930 Ω bal.;  
+23 dBV  
1860 Ω unbal.  
1860 Ω unbal.  
DC Power  
Mix Bus  
(M267)  
3.5 kΩ  
3.5 kΩ  
-17 dBV  
18 Vdc nominal at 40 mA typical no-signal, 45 mA typical at +4  
dBm output; 13.5 Vdc minimum  
Batteries  
Outputs  
Two 9 V alkaline batteries  
Battery Life  
IMPEDANCE  
Output  
Up to 8 hours* at +4 dBm output in continuous use.  
*(see Battery Operation)  
Output  
Designed for  
Use With  
Actual  
(Internal)  
Clipping  
Level  
Temperature Range  
Mic  
Line  
Low-Z inputs  
600 Ω  
1 Ω  
-31 dBV  
+18 dBm  
+11 dBV  
+11 dBV  
Operating: -18° to 57° C (0° to 135° F)  
Storage: -29° to 74°C (-20° to 165° F)  
Overall Dimensions (H x W x D)  
71.9 mm x 308 mm x 233 mm (2 13/16 in. x 12  
5/32 in. x 9 5/32 in.) including feet.  
Weight (without batteries)  
150 Ω  
300 Ω  
Phones  
8 to 200 Ω  
Mix Bus  
(M367)  
930 Ω bal.;  
930 Ω bal.;  
1860 Ω unbal.  
1860 Ω unbal.  
3 kg (6.6 lb)  
Mix Bus  
(M267)  
3.5 kΩ  
3.5 kΩ  
-28 dBV  
Measurement conditions (unless otherwise specified): operating  
voltage 120 Vac, 60 Hz (18 ±1 Vdc for dc test); operating tempera-  
ture 22°C (72°F); input signal 1 kHz; internal DIP switches 1–7 open;  
Power switch on; Mic/Line switches to Line; low-cut switches to flat;  
Limiter out; Phantom power off; Mix Bus to M367; channel 1 gain full  
CW; channel 2 through 6 full CCW; Master full CW; Phones level full  
Equivalent Input Noise  
–127 dBV with 150 Ω source, 400 to 20,000 Hz  
Output Noise  
Master level full CCW: 100 dBV, 400 to 20,000 Hz  
Master level full CW: 80 dBV, 400 to 20,000 Hz  
Hum and Noise  
CCW; Line output terminations 600  
minations 150 (pins 2 and 3); Phones (1/4"–ring) 300  
Phones (1/4"–tip) 300 to ground; Phones (3.5 mm) unloaded; Mix  
Bus 930 (M367 position) or 3.5 k (M267 position), not connected  
unless specified; 1 kHz input signal.  
Ω
(pins 2 and 3); Mic output ter-  
Ω
Ω
to ground;  
Ω
Equivalent Input: 125 dBV, 20 to 20,000 Hz  
Output: 95 dBV (Master CCW), 75 dBV; (Master CW), 20 to  
20,000 Hz  
Ω
Ω
Common Mode Rejection Ratio  
65 dB at 100 Hz, 20 dBV input  
5
 
REPLACEMENT PARTS  
GENERAL INFORMATION  
Foot Kit (4 in kit)........................................................... 90S8100  
M367 Fuse, 0.125 A, 250 V ........................................... 80E380  
M367E Fuse, 0.063 A, 250 V.........................................80G380  
Knob  
Master .......................................................................... 95A8238  
Channel Gain, Phones................................................. 95B8238  
Line (Power) Cord  
Changes or modifications not expressly approved by Shure, Inc.  
could void your authority to operate this equipment.  
This equipment has been tested and found to comply with the limits  
for a Class B digital device pursuant to Part 15 of the FCC Rules  
and as set out in the Radio Interference Regulations of the Cana-  
dian Department of Communications. These limits are designed to  
provide reasonable protection against harmful interference in a  
residential installation. This equipment generates, uses, and can  
radiate radio frequency energy and, if not installed and used in ac-  
cordance with the instructions, may cause harmful interference to  
radio communications. However, there is no guarantee that inter-  
ference will not occur in a particular installation. If this equipment  
causes harmful interference to radio or television reception, deter-  
mined by turning the equipment off and on, try to correct the inter-  
ference by one or more of the following measures:  
M367............................................................................ 95A8389  
M367E.......................................................................... 95B8389  
OPTIONAL ACCESSORIES  
Rack Mount Kit.................................................................A367R  
STATEMENT OF CONFORMITY  
1. Reorient or relocate the receiving antenna.  
Conforms to European Union directives, eligible to bear CE  
marking; VDE GS-Certified to EN60065; meets European Union  
EMC Immunity Requirements (EN 50 082-1, 1992): RF radiated  
(IEC 801-3): meets Criterion A, ESD: meets Criterion B, EFT  
(IEC 801-4): meets Criterion B.  
2. Increase the separation between the equipment and receiver.  
3. Connect the equipment into an outlet on a circuit different from  
that to which the receiver is connected.  
4. Consult the dealer or an experienced radio/TV technician  
for help.  
6
 
INTERNAL ADJUSTMENTS  
4. Adjust the 1 kHz tone oscillator level with the Master gain con-  
trol until the ac voltmeter reading is at the level desired  
5. With the M367 top cover removed, adjust the VU Level Cali-  
bration trim pot R684 with a screwdriver until the VU Meter  
reads 0.  
NOTE  
Only qualified service technicians should perform these  
modifications.  
6. For 0 VU settings between +4 and +8 dBm, set internal DIP  
switch S701 position 1 "down", and perform steps 1 through 5.  
These internal adjustments require only removal of the top  
cover:  
1. Remove battery compartment.  
2. Remove four screws securing two plastic end caps and one  
ground-bonding screw on the side opposite the battery com-  
part ment.  
3. Slowly slide cover up and off chassis.  
VCA DISTORTION TRIMPOT (R607)  
VU METER  
VCA  
CALIBRATION  
DISTORTION  
DO NOT ADJUST! This potentiometer is precisely calibrated on  
each mixer for minimum distortion.  
TRIMPOT  
TRIMPOT  
R684  
R607  
VU METER ADJUSTMENT (R684)  
This trimpot adjusts the VU meter to indicate 0 VU at a preset  
output level. The factory setting is +4 dBm. The user adjustment  
range is -10 dBV to +4 dBm (-6 dBV to +8 dBm with DIP switch 1  
down).  
To set the VU meter to a value other than the factory setting  
(0 VU = +4 dBm), proceed as follows:  
1. Connect a 600 Ω load to an XLR output set for Line.  
2. Connect an ac voltmeter with 1 MΩ or greater input  
impedance (Fluke 77 or equivalent) in parallel with the load.  
3. Set the 1 kHz tone oscillator switch to the ON position.  
(ACCESSED  
THROUGH  
HOLE IN  
UPPER FRONT  
PC BOARD)  
DIP SWITCH  
S701  
INTERNAL ADJUSTMENTS  
FIGURE 5  
7
 
INTERNAL MODIFIABLE FUNCTIONS  
Pad  
X421  
X431  
X441  
Channel  
Pad  
X451  
X521  
X531  
Channel  
NOTE  
1
2
3
4
5
6
Only qualified service technicians should perform these  
modifications.  
Perform all modifications through solder points accessible on  
the main PC board.  
2. Locate the following empty pads:  
Find all pads near ribbon cable assemblies W811, W812 and  
W813.  
3. Solder a new capacitor through the holes of the empty pads  
for each channel to be modified.  
DISASSEMBLING THE M367  
1. Remove the mixer top cover as previously described.  
2. Carefully remove three multi-pin cable assembly connectors  
from upper front PC board (nearest front panel). Remove the  
three Phillips head screws securing the PC board. Remove up  
per front PC board.  
3. Carefully remove four multi-pin cable assembly connectors  
from upper rear PC board (nearest rear panel). Remove the  
three Phillips head screws securing the PC board. Remove  
upper rear PC board.  
4. Perform modification (refer to appropriate following proce-  
dure). Note that all modifications can be performed without  
removing the main PC board.  
5. Reassemble M367 by performing above steps in reverse,  
assembling the Phillips screws in the order indicated on the  
upper front and upper rear PC boards.  
To increase corner frequency:  
Note: Low-cut corner frequencies much higher than the factory  
preset of 260 Hz may excessively attenuate desired low- to  
mid-frequency program material.  
1. Locate the following capacitors near empty pads:  
Capacitor  
C425  
Channel  
Channel  
Pad  
X421  
X431  
X441  
Capacitor  
C455  
Pad  
X451  
X521  
X531  
1
2
3
4
5
6
C435  
C525  
C445  
C535  
2. Remove the indicated capacitor for each channel to be  
modified.  
3. Calculate new capacitor value for higher high-cut corner fre  
quency. Use the following formula:  
C in μF= (85/frequency)  
CHANGING LINE LEVEL OUTPUT IMPEDANCE TO 600 Ω  
Locate resistor R621 (near IC U602 pin 8) on the main PC board  
and remove it. Locate empty pads X621 (near resistor R621).  
Solder a 430 Ω, 1/2 W resistor through the holes at X621.  
Example: for 400 Hz corner frequency,  
C = (85/400) = 0.21  
CHANGING UNSWITCHED LINE OUTPUT TO MIC LEVEL  
For 400 Hz corner frequency, use a 0.22 μF capacitor.  
Locate resistor R632 (near output transformer T601) and  
remove. Locate empty pads X632 (near transformer T601). Solder  
a jumper wire through the holes of X632.  
4. Solder a new capacitor through the holes of the empty pads  
for each channel to be modified.  
SLOWING OUTPUT METER FROM "True VU" BALLISTICS  
CHANGING MIXER AUDIO LEVELS IN HEADPHONES  
(Pull/Monitor Switch Activated, DIP Switch S701 Position  
4 Closed)  
Locate empty pads X691 (at left of VU meter M1). Solder a 100  
μF x 6.3 V electrolytic capacitor through the holes of X691. Ob-  
serve capacitor polarity as marked on the PC board. The response  
time is now 500 ms with no overshoot. To further slow the meter  
response, use a larger capacitor value.  
Locate empty pads X649 (near Phones potentiometer R648).  
Solder a 68 kΩ, 1/4 W resistor through the holes at X649 to hear  
program audio 12 dB down from standard headphones level with  
Pull/ Monitor switch on (pulled out). Solder a 24 kΩ, 1/4 W resistor  
through the holes at X649 to hear program audio 6 dB from  
standard headphones level with Pull/Monitor switch on (pulled out).  
CHANGING MIC LEVEL OUTPUT IMPEDANCE  
Locate resistor R631 (near output transformer T601) and  
remove it. Locate empty pads X631 (near T601). Solder desired  
value 1/4 W resistor through the holes of X631. For example, use  
a 150 Ω, 1/4 W resistor for 150 Ω output impedance.  
CHANGING LOW-CUT FILTER CORNER FREQUENCY  
(3 DB DOWN POINT)  
To decrease corner frequency:  
1. Calculate new capacitor value for lower low-cut corner  
frequency. Use the following formula:  
C in μF= (85/frequency) - 0.33  
Example: for 200 Hz corner frequency,  
85/200 9 0.43  
0.43 - 0.33 = 0.1  
For 200 Hz corner frequency, use a 0.1 μF capacitor.  
NOTE:  
Capacitor must be non-polarized; ceramic or film type;  
16V rating or higher.  
8
 
ADAPTING LINE OUT TO DUAL BANANA JACK  
CHANGING MONITOR IN HIGH GAIN (DIP Switch S701  
Position 5 Down)  
Add a dual banana jack, balanced, line-level output capability by  
purchasing a commercial unit (Sescom XLR F-3BP or equivalent),  
or obtaining a female XLR connector (Radio Shack 274-011 or  
equivalent), a dual banana jack (ITT 2269 or equivalent), a small  
utility box, and a short length of high-quality shielded output cable  
and constructing the adapter shown in Figure 6.  
Locate resistor R647 (near Phones potentiometer R648) and re-  
move it. Locate empty pads X647 (near R647). Solder a 330  
resistor in the holes of X647 for 6 dB gain boost with DIP switch S701  
position 5 down (input impedance equals 6.5 k in this position).  
Ω,1/4 W  
Ω
CHANGING MONITOR IN JACK FROM MONO INPUT TO  
STEREO SUM INPUT  
Locate empty pads X645 (near Monitor In jack J863). Solder a  
1 kΩ, 1%, 1/4 W resistor in the holes of X645. The Monitor In jack  
will now accept a stereo input signal (tip left, ring right, sleeve  
ground), and sum these signals to the monitor circuit.  
1
2
NOTE  
3
If using a true stereo feed to drive the M367 Monitor In and  
another stereo device, the source impedance must be 20 Ω or  
less to maintain at least 40 dB separation in the stereo device.  
Use a stereo distribution amplifier or buffer to maintain optimum  
stereo separation.  
DUAL BANANA JACK OUTPUT  
FIGURE 6  
MASTER GAIN REMOTE CONTROL  
Connect this adapter to the M367 Line output.  
NOTE  
This modification disables both the M367's monitor function and  
its front-panel Master gain control.  
CHANGING MONITOR IN TO AUX IN  
NOTE:  
1. Remove resistor R641 (near Monitor In jack J863).  
2. Remove resistor R746 (near Master potentiometer R706).  
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). Solder the other end  
of the insulated wire to X644.  
4. Locate empty pad X701 (next to empty pad X702). Solder an  
insulated wire to X701. Locate empty pads X645 (near jack  
J863). Solder the other end of the insulated wire to the empty  
pad X645 nearest channel 6 input connector J856.  
5. Construct a remote control potentiometer/cable assembly as  
shown in Figure 7.  
This modification disables the M367's monitor function.  
Remove resistors R642 and R647 (near Phones potentiometer  
R648).  
Locate empty pads X601 (near output transformer T601) and  
X643 (near Monitor In jack J683).  
Solder a jumper wire from X643 to X601. The Monitor In jack is  
now an unbalanced (tip positive, sleeve ground) Aux In jack, with  
an input impedance of 11 kΩ and a maximum gain to Line Out  
(loaded with 600 Ω) of 17 dB. The Aux In signal is only controlled  
by the Master control.  
To change Aux In gain, locate resistor R605 (near X601). Care  
fully remove R605 and replace it with a surface-mount resistor  
(0805 package) of the desired value. If replacing R605 with 15 kΩ,  
maximum Aux In to Line Out gain equals 14 dB and input  
impedance equals 16 kΩ; if replaced with 6.8 kΩ, maximum Aux In  
to Line Out gain equals 20 dB and input impedance equals 7.8 kΩ.  
TIP  
RING  
CW  
SLEEVE  
MASTER GAIN REMOTE CONTROL  
FIGURE 7  
Recommended parts are:  
Potentiometer, 10-25 kΩ, linear taper (Radio Shack  
271-1715)  
1/4 in. Stereo Phone Plug (Switchcraft 280)  
Ferrite Bead Rings (Ferronics 21-031J)  
Capacitors, ceramic, 0.001 μF, 50 V  
Cable, 2-conductor, shielded, 50 ft maximum (15 m)  
Ferrite bead rings and capacitors should be as close to the  
phone plug as possible.  
6. Insert the phone plug in the Monitor In jack. The remote con-  
trol potentiometer now controls M367 gain with a control taper  
similar to that of the Master gain control.  
9
 
CHANGING LIMITER RELEASE TIME TO ONE SECOND  
6. Calculate resistor R6 value as follows:  
Remove resistor R741 (about 15 mm behind ribbon cable  
assembly W813).  
1
R6 =  
1
R3  
1
R1  
CHANGING LIMITER THRESHOLD PRESETS  
1. Select the equivalent resistor values for the desired limiter  
thresholds from the following table. Then fill in the following  
work sheet with the resistor selections.  
Select a 1/4 W, 1% resistor closest in value to R6 and solder it  
to the holes of X734.  
7. Calculate resistor R7 value as follows:  
Limiter Threshold  
Requiv  
Limiter Threshold (  
Requiv  
1
(dBm into 600 Ω)  
dBm into 600 Ω)  
(kΩ)  
(kΩ)  
R7 =  
1
R4  
1
R1  
1
R5  
1
R6  
0
1
2
3
4
5
6
7
8
9
18  
21  
25  
30  
35  
41  
47  
54  
62  
71  
10  
11  
12  
13  
14  
15  
16  
17  
18  
81  
Select a 1/4 W, 1% resistor closest in value to R7 and solder it  
to the holes of X735. (See Changing Limiter Threshold Presets:  
Samples Calculations later in the Appendix for an example of  
limiter threshold preset component calculations.)  
93  
105  
122  
139  
156  
175  
194  
215  
CHANGING LIMITER THRESHOLD PRESETS: SAMPLES  
CALCULATIONS  
For the following limiter thresholds:  
DIP Switch S701  
Limiter Threshold  
R
equiv  
Position  
2
Position  
3
dBm  
up  
up  
high  
12  
105  
R
equiv (above)  
DIP Switch S701  
Limiter Threshold  
kΩ=R1  
Position 2  
Position 3  
dBm  
down  
up  
up  
med. high  
med. low  
low  
8
4
0
62 kΩ=R2  
35 kΩ=R3  
18 kΩ=R4  
up  
down  
up  
up  
up  
high  
_____  
_____  
_____  
_____  
kΩ = R1  
kΩ = R2  
kΩ = R3  
kΩ = R4  
down  
down  
med. high  
med. low  
low  
down  
down  
down  
1. Obtain a 105 kΩ, 1/4 W, 1% resistor and solder it to the holes  
down  
of X732.  
2. Remove resistors R721, R731, R732, R733, R734 and R735  
(surrounding IC U704).  
2. Obtain a 150 kΩ, 1/4 W, 1% resistor and solder it to the holes  
of X733.  
3. Locate empty pads X732, X733, X734 and X735 (surrounding  
IC U704).  
4. Select a 1/4 W, 1% resistor closest in value to R1 (from the  
work sheet), and solder it to the holes of X732.  
1
R
5 =  
= 151.4 k:  
1
1
105,000  
62,000  
Note: Use parallel or series combinations of resistors to match  
the chosen values as closely as possible if 1% resistors are not  
available.  
3. Obtain a 52.3 kΩ, 1/4 W, 1% resistor and solder it to the holes  
of X734.  
5. Calculate resistor R5 value as follows:  
1
1
R6 =  
1
= 52.5 k:  
1
105,000  
35,000  
R5 =  
1
R2  
1
R1  
4. Obtain a 49.9 kΩ, 1/4 W, 1% resistor and solder it to the holes  
of X735.  
Select a 1/4 W, 1% resistor closest in value to R5 and solder it  
to the holes of X733.  
1
R
7 =  
1
1
1
1
18,000  
52,300  
105,000  
150,000  
= 49.4 k:  
10  
 
SHURE Incorporated http://www.shure.com  
United States, Canada, Latin America, Caribbean:  
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.  
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446  
Europe, Middle East, Africa:  
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414  
Asia, Pacific:  
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055  
 

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