Electro-Voice US621L User manual

EleclroVoice
e
Commercial Microphones
Description
These microphones were designed for com-
munications and paging applications. Both
models are also useful in amateur radio, CB,
aeronautical and commercial base station
installations.
The US621L is an omnidirectional dynamic
microphone with wide-range frequency re-
sponse making it an excellentchoice for gen-
eral-purpose and office paging applications.
The US622L is a noise-cancelling dynamic
microphone designed for paging, dispatch-
ing and call systems in which background
noise is high or for reduction
of feedback
under difficult acoustical conditions. The
US622L allows the user to speak closely into
the microphone in a normal voice, while
background noise is greatly attenuated. The
frequency response was designed to ensure
excellent intelligibility.
The rugged, diecast stand is carefully bal-
anced for handheld use as a "grip to talk"
microphone, yet will remain firmly posi-
tioned for "touch to talk" use. The switch
assembly will survive many hundreds
of
thousands of use cycles--assuring the ulti-
mate in reliability. The switch assembly may
be changed from "touch to talk" to "grip to
talk." The switch may be locked in the "on"
position for "hands free" operation. There is
an adjustment screw that permits the lock-
ing feature to be defeated. This control is
accessible only when the switch is located
in the "touch to talk" position.
Locking
Feature
In the "touch to talk" position, the switch is
locked in the "on" position by depressing the
switch bar and sliding it to the right.
If the
switch assembly is mounted in the "grip to
talk" position, the switch bar should be de-
pressed and slid upwards to lock.
To unlock
the switch bar, reverse the procedure.
Defeating the Locking
Feature
With the switch in the "touch to talk" con-
figuration, the locking feature may be de-
feated by an adjustment screw located
through the access hole in the bottom plate
(see Figure 5). Rotating the screw fully
clockwise defeats the locking feature.
To de-
feat the switch locking feature in the "grip
to talk" configuration, the adjustment must
be made prior
to moving the switch assem-
bly to the neck location.
To restore the lock-
ing feature, tum the adjustment screw coun-
terclockwise until locking is now possible.
US621L
US622L
DYNAMIC DESKTOP
MICROPHONES
• Touch to talk
• 7-foot, 5-conductor cable with
bare-wire termination
• US621l: Omnidirectional
US622l: Cardioid,
noise-cancelling
Changing Switch Connections
The US621L and US622L are shipped with
switch connections as shownin Figure
6. The
microphones have shorted outputs in the
"off" position. See Figure 6 for complete in-
structions.
The switch assembly is easily accessible for
wiring revisions. First, remove the bottom
cover plate, then remove the two switch as-
sembly screws to release the assembly for
easy access
to switch terminals.
Parallel
Operation
If the US621Land US622Lare to be used in
applications such as multiple microphone
paging installations (where several units are
connected in parallel to a single microphone
input), changes must be made as shown
in
Figure 6. Cutting the short wire "opens" the
microphone output when the switch is in the
"off" position; this will allow multiple mi-
crophone applications.
Relocating Switch
The microphones are designed for "touch to
talk" or "grip to talk" operation. When re-
ceived from the factory, the switch is
mounted on the base for "touch to talk" use.

US6Z 1 Land US6ZZL Dynamic Microphones
H desired, the switch may be relocated with-
out wiring changes to the neck of the micro-
phone for "grip to talk" operation.
To relocate the switch, proceed as follows:
~ 1.
Remove the black plastic cover from the
neck of the microphone by gently lifting
one endwitha flat blade. Thiswill expose
the"gripto talk" switch opening. Savethe
cover, as it will be needed for the opening
on the base
of the microphone.
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~ 2. Remove two screws and the cover plate
from the bottom
of the microphone.
c:
S Slip the strain-reliefspring from slot.
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N 4. Removethe two screws located in the neck
of the microphone.
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Gently lift switch assembly away from
microphone housing.
...J 6. Thrn the entire switch assembly sothe top
~ surface of the switchbarfaces the front of
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the microphone with wires protruding
from the bottom
of the switch.
7. Secure switch assembly in the neck with
the two screws.
8. Check the action
of the switch to ensure
that allwiresare properly seated and have
notbecomeentangledin the switch assem-
bly.
9. Loop the cable around the bass located in
the housing base and seat the strain-relief
spring at the rear
of the microphone base.
Secure the bottom plate with two screws.
10. Place the blackplasticcoverintothe open-
ing on the base(from whichthe red switch
barwas previously removed) by inserting
the two tabs into the opening and snap-
ping cover into position.
Architects' and Engineers' Specifications
The model US621L microphone shall be an
omnidirectional, dynamic type with uniform
frequency response from 100-9,000 Hz. The
model US622L microphone shall be a noise-
cancelling dynamic type with uniform fre-
quency response from 125-5,000Hz. The mi-
crophoneoutputimpedance shall bespecified
150 ohms. The output level shall be -57 dB
(0 dB=lm WIlO dynes/cm2 ). Themicrophone
case shall be
of Cycolacand diecast zinc, and
shall include a diecast zinc table stand inte-
gral with the microphone case. The assembly
shall be 246.1
mm (9.69 in.) high x 114.3 mm
(4.5 in.) wide x 122.2 mm (4.81 in.) deep.
A
DPDT switch shall be provided, one sec-
tion of which shall normally short circuit the
transducer when switch is in "off" position.
(Provisions shall be made for connecting the
normally openmode in
"off" positionandclos-
ing the microphone circuit for "on" position
for multiple microphone paginginstallations.)
A second switch section shall be provided
withthe capabilitytofunction eitherin anelec-
tronic switching mode or for operation of ex-
ternal relay. A locking feature shall be pro-
videdbymeans
of whichswitchmaybelocked
in
"on" position. A 2.13 m (7 ft) blackplastic-
jacketed, five-conductor, two-shielded cable
shall be furnished. The finish
of the integral
stand and microphone shall be nonreflecting
blue-black. Net weight shall be 822 g
(lib,
13 oz).
The Electro-Voice commercial microphones
US621L and US622L are specified.
Unifonn Limited Warranty Statement
Electro-Voice productsareguaranteedagainst
malfunction due to defects in materials
or
workmanship for a specified period, as noted
in the individual product-line statement(s)
below,
or in the individual product data sheet
or owner's manual, beginning with the date
of original purchase. If such malfunction oc-
curs during the specified period, the product
will be repaired
or replaced (at our option)
without charge. The product will be returned
to the
customer prepaid. Exclusions and
Limitations: The Limited Warranty does not
apply to: (a)exteriorfinish or appearance; (b)
certain specific items described in the indi-
vidual product-line statement(s) below, or in
the individual product data sheet
or owner's
manual; (c) malfunction resulting from use or
operation
of the product other than as speci-
fied
in the product data sheet or owner's
manual; (d) malfunction resulting from mis-
use or abuse of the product; or (e) malfunc-
tion occurring at any time after repairs have
beenmade to the productbyanyone otherthan
EVI Audio Service
or any of its authorized
servicerepresentatives. Obtaining Warranty
Service: To obtain warranty service, a cus-
tomer must deliver the product, prepaid, to
EVIAudio Service
or any of its authorized
service representatives togetherwith proof of
purchase of the productinthe form of a bill of
sale or receipted invoice. A list of authorized
service representatives is available from
EVIAudioServiceat 600CecilStreet, Bucha-
nan, MI 49107 (800/234-6831 or FAX
616/695-4743). Incidental and Consequen-
tial Damages Excluded: Product repair or
replacement and return to the customer are
the only remediesprovided to the customer.
Electro-Voice shall not
be liable for any in-
cidental or consequential damages includ-
ing, without limitation, injury to persons
or
property or loss of use. Some states do not
allow the exclusion orlimitation
of incidental
or consequential damages
so the above limi-
tation or exclusion may not apply to you.
Other Rights: This warranty gives you spe-
cificlegal rights, and you may'also have other
rights which vary from state to state.
Electro-Voice Wired Microphones areguar-
anteed againstmalfunctionfrom anycause for
two (2) years from the date
of original pur-
chase. In addition, the Limited Warranty for
the acoustic system contained in these micro-
phones shall apply for the life
of the product,
defined as a period
often (10) years from the
date that the manufacture
of the specific mi-
crophone has been discontinued. Any and all
active electronics incorporatedinthese micro-
phones are guaranteedagainst malfunctiondue
to defects in materials
or workmanship for a
period
of three (3)yearsfrom the date of origi-
nal purchase. The Limited Warranty does not
extendtocables,cableconnectors, orswitches.
Additionaldetails are includedin the Uniform
Limited Warranty statement.
For warranty repair, service information, ora
listing
of the repairfacilities nearest you, con-
tact the service repair department at:
616/695-6831 or 800/685-2606.
For technical assistance, contact Technical
Supportat800/234-6831 or616/695-6831, M-
F, 8: 00 a.m. to 5:00 p.m. Eastern Standard
time.
Specifications subject to change without no-
tice.

US6Z I Land US6ZZL Dynamic Microphones
Figure l-US621L Frequency Response
Figure
2-US622L Frequency Response
Figure
3-US621L PolarResponse
0°
270· "I-1-+-+-+-+--i
180°
1--+-+-+-+-+-190°
lePEA
DM8ION
+10
·10
21. ..
+10
·10
21. ..
CLOSE TALK RESPONSE 1/4 INCH
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1.1 '"
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1.
III III
I. _ -
FREQUENCY IN HERTZ
CLOSE TALK RESPONSE 1/4 INCH
V'\
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,,-
,
1. III III
I. _
FREQUENCY IN HERTZ
Figure 4-US622L Polar Response
---- HORIZONTAL
-VERTICAL
270"l-t-+Irt+-+-+-;
l-H--+-:'-fH--l9O°
180°

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US62 I Land US622L Dynamic Microphones
FIGURE 5-US621L/US622L Bottom
View
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US621L
Et DYNAIlIC IIICROPHONE
LOW .... DoUICI:
~.
--
lADE II U.S.A . ..--,_U.aA.
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FIGURE 6--US621L/US622L Wiring
Diagram
CUT THIS LEAD 10 DPEN
DUTPUT UNE IN OFF POsmON
RED
GREEN
I WHITE
------- -1- -- ~
...
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III
TURN SCREW CLOCKWISE TO
DEFEAT LOCKING FEATURE
SPECIFICATIONS
US621UUS622L:
Dynamic
Frequency Response,
US621L (see Figure 1):
100-9,000 Hz
US622L (see Figure 2):
125-5,000 Hz
Polar Pattern,
US621L (see Figure 3):
Omnidirectional
US622L (see Figure 4):
Cardioid, noise-cancelling
Impedance, US621UUS622L:
150 ohms
Output Level, US621UUS622L:
-57 dB (0 dB =1 mW/I0 dynes/em')
Case Material, US621UUS622L:
Pressure-cast zinc and Cycolac
Finish, US621UUS622L:
Bluelblack
Dimensions, US621UUS622L,
Height: 146 .1 mm (9. 69 in .)
Width: 114.3
mm (4.5 in.)
Depth: 122.2 mm (4 . 81 in .)
ElecfroVoice
8
Net Weight, US621UUS622L:
822 g (lIb , 13 oz)
Switch, US621UUS622L:
Leaf, DPDT, switches external circuit and
shorts or opens mike in "off" position
Cable, US621UUS622L:
2.13 m (7 ft) long, 5-conductor, 2-shielded,
vinyl jacket, black
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COMMERCIAL MICROPHONES
600 Cecil Street, Buchanan, MI 49107
616/695-6831,616/695-1304 Fax
©EVI Audio 1997 • Litho in U.S.A. Part Number 532591-9744