Shure M62V User Guide

222 HARTREY AVE., EVANSTON.

AREA CODE 312/328-9000 . CABLE: SHUREMICRO

IL.

60204 U.S.A.

MODEL M62V AUDIO LEVEL CONTROLLER

SHEET

DATA

MODEL M62V

AUDIO LEVEL CONTROLLER

GENERAL:

The "Level-Loc" Audio Level Controller is basically a low-noise preamplifier with unity gain from the microphone level input to the microphone level output or 60 dB of voltage gain from the high-impedance microphone level input to the auxiliary level output. The input and microphone level output contain matching

transformers so either high- or low-impedance operation may be selected. In addition, a high-impedance auxiliary output is provided capable of driving any

high-impedance amplifier, mixer or tape recorder input

requiring 1 volt or less. This preamplifier has the additional capability of reducing its gain as the input signal increases, thereby holding the output signal constant. After a predetermined input level threshold is reached the output level is "locked", that is, it remains constant even if the input signal increases by as much as 100 times (40 dB). This reduction in

gain, which results in a constant output level, is

obtained without introducing significant distortion or transients into the program material. The DISTANCE SELECTOR switch determines the input level at which gain reduction (Level-Loc action) begins. An INPUT LEVEL control is also provided that:

1. Can be used as a vernier control to allow fine adjustment of input threshold between the preset threshold levels selected by the DISTANCE SELECTOR switch.

2. Can act as an input attenuator for signals that are higher than normal microphone levels. Such inputs may be: signals from microphones used very close to the mouth, outputs from preamplifiers, line amplifiers, tuners or tape recorders.

The Audio Level Controller:

Reduces blasting or large volume increases when a speaker or entertainer varies his distance and position from the microphone.

Upgrades tape-recording systems and the Audio portion of Video Tape Recorders, by controlling the maximum signal level being fed to the recorder. This prevents distortion and overloading of the tape recorder which might be caused by "close talking" the microphone, or by very loud vocal or musical passages.

Permits any number of microphones to be used

a paging system or conference arrangement, without setting the level for each individual microphone. (For paging systems only dance microphones with normally open switches

should be used.) Any number of these microphones may be operated in parallel across the low-impedance input of the Level Controller will automatically set a fixed maximum paging level that cannot be exceeded.

M62V, the Audio

SPECIFICATIONS

lnput lmpedance

High Impedance: 50 kilohms Low Impedance: 300 ohms (for 25 to 600 ohm

lnput Levels:

High Impedance: Microphone level to 10 volts

Low Impedance: Microphone level to

Output Impedance:

High lmpedance Microphone Level:

Minimum recommended load:

Low lmpedance Microphone Level: Less than 50

ohms Minimum recommended load:

Aux. Output: 10 kilohms

Minimum recommended load: 10 kilohms

Gain Characteristics:

control maximum (10) DISTANCE SELECTOR in

"18" or More" position; measured from input to output]

INPUT

Hi Imp. Mic. Lo Imp. Mic.

Frequency Response:

i2 dB 40 to 20,000

(below threshold):

sources)

max. (using INPUT LEVEL control)

I Below threshold, INPUT LEVEL

OUTPUT

Imp.

Mic.

Unity

+20 dB

Imp.

Mic.

-20 dB Unity

3.3

kilohms

ohms

Aux.

+60 dB +80 dB

low-impe-

.2 volt

kilohms

Output

27A823 (PC)

1976,

Shure

Brothers

Inc.

Printed

U.S.A.

Maximum Output Noise

PUT, in dB below

1 volt):

(HI IMPEDANCE MIC. OUT-

300-20.000

(Noise)

30-20,000

(Hum

Lo Imp. lnput

150 ohm Termination -103 dB -95 dB Hi Imp. lnput

kilohm Termination -104 dB -95 dB

Distortion

Dynamic Characteristics:

(any level of regulation):

maximum THD

Fast attack, moderate re-

covery, fixed.

Attack: For a 20 dB step increase above thres-

hold, gain is within 2 dB of final value in 500 microseconds.

Recovery: For a 20 dB step decrease to thres-

hold, gain is within 2 dB of final value in 700 milliseconds.

Battery Life: Dimensions: Net Weight:

Approximately 200 hours

See Figure

kg (2.2 Ib)

and

Noise)

switch above the receptacle. This output is designed

to work into a 25- to 600-ohm microphone line or

microphone input, or into

high-impedance amplifier or tape recorder microphone input. The receptacle is a professional three-pin male audio connector.? See Figure 2B for microphone level output receptacle connections.

SHIELD

-. .

- -

I /

-.........

MIC.

OUTPUT

HIGH

IMPEDANCE

MICROPHONE

OUTPUT

MIC

OUTPUT

PLUG

IBALANCEO

CONNECTIONS

LOW

IMPEDkNCE

LINE)

A,,

FIGURE 28

The receptacle marked AUX. OUTPUT is a phono

pin jack which accepts a standard phono pin plug.

This output is designed to work into a high-impedance (10 kilohms or greater), high-level input of a mixer, preamplifier, amplifier, or tape recorder. This output may be connected to the AUX. INPUT of an M68 Series

Mixer, the HIGH-LEVEL INPUT of an M63 Audio Master

or the

LINE INPUT (bridging) of an M67 Professional

Microphone Mixer.

The static characteristics of the high-level AUX.

OUTPUT are shown in Figure

a constant

1 volt level (with a 47-kilohm load) when-

IB. This output provides

ever the input level is above threshold. Below threshold it provides approximately 60 dB of gain over the HI-IMP MIC. input.

NOTE: This output is disabled when the MASTER

CONTROL switch is set to "Bypass."

-90 -80 -70 -60 -50 -40 -30 -20 -10 0

lnput Connections:

INPUT VOLTAGE

DBV

STATIC INPUT-OUTPUT CHARACTERISTICS

(INPUT LEVEL CONTROL

FIGURE

The receptacle marked MIC. INPUT

VOLTS

RM5

(DBV)

RE I V

MAXIMUH)

is designed for either low (25- to 600-ohms)

IMP

MIC.

or high-

impedance (50,000-ohms) inputs. 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 professional three-pin female audio connector.? See Figure 2A for low- and high-impedance connections to receptacle.

-..

LOW IMPEDANCE (BALANCED

INPUT

INPUT INPUT

LINE)

PLUG

CONNECTIONS

HIGH

IMPEDANCE

FIGURE 2A

Output Connections:

The receptacle marked MIC.

OUTPUT is a dual-impedance output selected by the

Designed to mate with Cannon (Q.G.)

series or equivalent connector.

(male)

95A548

(female)].

series, Switchcraft

[Shure part

95,4407

Battery and Auxiliary Power Connections:

The battery to power the M62V is shipped with the

unit but must be installed. Install as follows:

1. Remove Battery Compartment cover by removing the lower slotted screw holding cover, loosening the upper screw, and sliding the cover down.

2. Snap battery into clips provided.

Replace Battery Compartment cover and tighten screws securely.

Battery Replacement-Use or equivalent

9V Battery.

AUX. INPUT POWER:

Eveready type 216 or 222,

This jack is used as a power input when using the power supply of a Shure M67 or M68 Series Mixer or M63 Audio Master. In this case, the battery should be disconnected. connecting cable is provided to connect the AUX. INPUT POWER jack on the

M62V to the ACCESSORY 28 V. D.C. jack on the M68 Mixer or to the POS. (red) 30 V. D.C. jack on the M67 Mixer or M63 Audio Master.

In order to utilize ac 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

Vdc Battery Eliminator to power the M62V. The Battery Eliminator cable is to be slipped into the split rubber grommet on the cover of the battery compartment. To secure cable, rotate grommet Connection is to be made using the same battery clips that normally connect to the 9 volt battery.

(Note:

Shure

M683

M67

M63r

Eliminator is to be used, first remove the battery.)

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A special

turn.

Battery

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