Shure m62v owners manual

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222 HARTREY AVE . EvANsToN. ILL. (502M) U.S.A.

MICROPHONES IND ELECTRONIC MPOIEITS

AREA CODE (232575000 - CABLE SHUREMICRO

MODEL M62V
AUDIO LEVEL CONTROLLER

DATA SHEET

GENERAL:

The Level-Loc Audio Level Controller is basically
a low noise preamplifier with unity gain from micro»
phone level in to microphone level out or 60 db of
voltage gain from Hi Imp. microphone level in to Aux.
Output. The input and microphone level output contain
matching transformers so either high or low impedance
may be selected. In addition, a high impedance Aux.
Output is provided capable of driving any high im»
pedance amplifier, mixer or tape recorder input re-
quiring 1 volt or less. This preamplifier has the addi»
tional capability of reducing its gain as the input
signal increases, thereby ho/ding the output signal
constant. After a predetermined input level is reached
(threshold) 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-Lot 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 preampli-
fiers, line amplifiers, tuners or tape recorders.

The Audio Level Controller: -

- Reduces blasting or large volume increases
when a speaker or entertainer varies his dis-
tance 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 re-
corder. 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.

Copyright 1959. Shure Brothers Inc.
2mm (u)

MODEL M62V AUDIO LEVEL CONTROLLER

. Permits any number of microphones to be used
in a paging system or conference arrangement,
without setting the level for each individual
microphone. (For paging systems only low impe-
dance microphones with normally open switches
should be used.) Any number of these micro-
phones may be operated in parallel across the
low impedance input of the M62V. the Audio
Level Controller will automatically set a fixed
maximum paging level that cannot be exceeded.

SPECIFICATIONS

Input Impedance (below threshold):
High Impedance: 50 K ohms
Low Impedance: 300 ohms (for 25 to 600 ohm
sources)

Input Levels:

High Impedance: microphone level to 10 volts
max. (using input level control)

Low Impedance: microphone level to .2 volt
max. (using input level control)
Output Impedance:
High Impedance Microphone Level: 3.3 K ohms
Minimum recommended load: 5 K Ohms
Low Impedance Microphone Level: Less than 50
ohms
Minimum recommended load: 25 ohms
Aux. Output: 10 K ohms.
Minimum recommended load: 10 K ohms

Gain Characteristics: [Below threshold, Input Level
control Maximum (10); measured from input to

output] :
OUTPUT
INPUT Hi Imp. Mic. Lo Imp. Mic. Aux. Output
Hi Imp. Mic. Unity -20 db +50 db
Lo Imp. Mic. +20 db Unity +80 db

Frequency Response:
1 2 db 40 to 20,000 Hz

Prlnted In U.S.A.

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Maximum Output Noise (high-impedance microphone
output), in db below 1 volt:

300720,000 HZ 3020,000 HZ
(Noise) (Hum and Noise)
Lo Imp. input
150 ohm Termination -103 db -95 db
Hi Imp. Input
33 K ohm Termination -104 db -95 db

Distortion (any level of regulation):
3% maximum THD.

Dynamic Characteristics:
covery, fixed.
Attack: For a 20 db step increase above threshold,

gain is within 2 db of final value in 500
microseconds.

Fast attack, moderate re-

Recovery: For a 20 db step decrease to threshold,
gain is within 2 db of final value in 700
milliseconds.

Battery Life: Approximately 200 hours.
Dimensions: See Figure 5.
Net Weight: 2.2 lbs.

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FIGURE 1
Input Connections: The Cannon»type receptacle
marked INPUT is designed for either low (25 to 600
ohms) 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 female Cannon-type
XL»3»13 (uses XL-3-12 mate, Shure Part No. 95A55, or
XL-3-12C mate, Shure Part No. 95A227). See Figure
2a for low and high impedance connections to re-

ceptacle.
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INPUT PlUG CONNECTIONS

FIGURE 2a

Output Connections: 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
microphone input, or into a high impedance amplifier
or tape recorder microphone input. The receptacle
is a male three-pin Cannon type XL-3-14 connector
(uses XL-3-11 mate, Shure Part No. 95A38, or XL»3»11 C
mate, Shure Part No. 95A176). See Figure 2b for
microphone level output receptacle connections.

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MICROPHONE OUTPUT PlUG CONNECTIONS

FIGURE 2b

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 K ohm 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 1b. This output provides
a constant 1 volt level (with a 47 K ohm load) when-
ever the input level is above threshold. Below thres-
hold it provides approximately 60 db of gain over the
Hi»|mp Mic. Level Input.

NOTE: This output is disabled when the MASTER
CONTROL switch is set to Bypass.

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.

3. Replace Battery Compartment Cover and tighten
screws securely.

Battery Replacement-Use Eveready type 216 or 222,
or equivalent 9 V. Battery.

AUX. INPUT POWER: 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. A special
connecting cable is provided to connect the AUX.
INPUT POWER jack on the M62V to the Accessory
28 V. DO. jack on the M68 Mixer or to the Pos. (red)
30 V. DO. jack on the M87 Mixer or M63 Audio Master.

In order to utilize A.C. current, the use of a 9 volt
D.C. Battery Eliminator is suggested. There is a pro»
vision in the battery compartment cover that will allow
using a 9 V. DC. 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 com-
partment. To secure cable, rotate grommet V2 turn.
Connection is to be made using the same battery
clips that normally connect to the 9 volt battery.

(Note: If a Shure M68, M67 or M63, or a Battery
Eliminator is to be used, first remove the battery.)

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