Shure M62 User Guide
222 HARTREY AVE • EVANSTON, ILL. (60204) U.S.A.
AREA CODE 312/328-9000 • CABLE SHUREMlCRO
MODEL M62
AUDIO LEVEL CONTROLLER
General: The Shure Model M62 is a transistorized variable input level controlling
device especially designed to keep its electrical output constant although the input
signal from the microphone may vary considerably.
The Audio Level Controller:–
• Permits the speaker or entertainer to use the microphone at varying distances
and positions without a change in output volume-eliminates blasting and fadeouts.
• Upgrades tape-recording systems by controlling the volume being fed to the
recorder. This prevents distortion and overloading of the tape recorder which
is caused by excess volume from the microphone.
• Permits more than one paging system operator to use the public address system
without a change in output volume of that system.
• Prevents feedback from becoming “ear-splitting” and excessively loud.
Theory of Operation: The “Level-Loc" is basically a low noise, constant-output
device. Under very low signal conditions, the output is nearly 1 to 1 (that is, the
output level equals the input level). With a great amount of signal applied, a reduction in output may be obtained without introducing significant distortion or
transients to that signal. The degree of reduction is determined by the signal, i.e., the
greater the signal, the greater the reduction. The “Distance Selector” switch de-
termines the input level at which gain reduction begins. It has been calibrated to
show the distance from the microphone at which the gain reduction becomes effective,
using an average speaking voice and an average dynamic microphone. (See “Distance
Selector”)
HOW TO USE YOUR M62 LEVEL CONTROLLER
Input Connection: The Cannon type receptacle marked MIC. INPUT is designed for
either low (25 to 600 ohms) or high impedance dynamic or ribbon microphones. The
impedance is selected by a slide switch above the input receptacle. The unit is not
recommended for use with crystal or ceramic microphones. The input receptacle is
a female Cannon XLR-3-13 (uses XL-3-12 mate, Shure Part No. 95A55, or
XLR-3-12C mate, Shure Part No. 95A227). See Figure A for low and high
impedance connections to receptacle.
MICROPHONE INPUT PLUG CONNECTIONS
MICROPHONE OUTPUT PLUG CONNECTIONS
Output Connection: The receptacle marked MIC. OUTPUT is a dual impedance
output selected by the switch above the receptacle. This output is designed to work into
a 25 to 600 ohm microphone line or input, or into a high impedance amplifier or tape
recorder microphone input. The receptacle is a male three-pin Cannon XLR-3-14
type connector (uses XL-3-11 mate, Shure Part No. 95A38, or XLR-3-11C mate,
Shure Part No. 95A176). See Figure A for output receptacle connections.
FIGURE A
Battery and Auxiliary Power Connections
The battery to power the M62 is shipped with the unit but must be installed.
Install as follows:
1. Remove Battery Compartment Cover by removing the two slotted screws
holding cover.
2. Snap battery into clips provided.
3. Replace Battery Compartment Cover and tighten screws securely.
Battery Replacement– Use Burgess type 2U6, Eveready type 216, or equivalent
9 V. D.C. battery.
Aux. Input Power: This jack is used as a power input when using the 28 V. D.C.
power source from the Shure M68 Mixer. In this case, the battery should be disconnected. A special connecting cable is provided to connect from the M68 Mixer
jack marked ACCESSORY 28 V. D.C. to the M62 jack marked AUX. INPUT
POWER.
In order to utilize A.C. current, the use of a 9 volt D.C. Battery Eliminator is
suggested.
There is a provision in the battery compartment cover that will allow using a 9 V.
D.C. Battery Eliminator to power the M62. Battery Eliminator cable is to be slipped into
the split rubber grommet on the cover of the battery compartment. To secure cable,
rotate grommet ½ turn. Connection is to be made using the same battery clips that
normally connect to the 9 volt battery.
(Note: If the Battery Eliminator is to be used, first remove the battery.)
Loading...