Electro-Voice RE90B User manual

Description
TheElectro-VoiceRE90BandRE90BWare
partofthe Architectural Microphone Series.
The RE90B is a full-range condenser mi-
crophone designed to be used for surface
mountedapplicationssuchasdistancelearn-
ing centers, video conferencing systems,
teleconferencing systems, and sound rein-
forcements (see Figure 1). The polar pat-
tern of the RE90B is half-cardioid (half-
space cardioid) to promote good gain-be-
fore-feedback and suppress ambient noise
(see Figure 2).
Allboundary type microphones operated on
a flat surface are subject to an increase in
sensitivity of the microphone with increas-
ing frequency; this is called the baffle ef-
fect. To counteract this effect, the RE90B
has been designed with internal equaliza-
tion to give the RE90B a flat sensitivity re-
sponse. The RE90B is designed to be pow-
ered by an external 9-52 V dc phantom
power supply (DIN 45 596).
The RE90B microphone is encased in a
heavy-duty zinc die cast body protected by
a strong, perforated steel screen. The body
of the microphone is designed to provide
two distinctive functions. First, the case is
electronically isolated from the surface that
it is placed on by virtue of the rubber friction
pad and the internal fiber washers when per-
manentlymounted. Second,themicrophone's
miniature cable can be routed directly from
the rear of the microphone, or the cable may
be directed from the bottom of the micro-
phone though the table top without exposing
themicrophone cable. The microphone cable
is connected to the microphone by a pilfer-
resistant internal terminal block. For perma-
nent installation, a drilling template is pro-
vided.
The RE90B's body is designed as a low-pro-
file housing. Both microphones are shock
mounted through a combination of a heavy
diecastcase,a rubber nonslip bottom pad, and
internal padding of the microphone and
printed circuit board. This combination of
isolation minimizes the mechanical coupling
of surface vibrations to the microphone.
For the RE90B, a 1.8-m (6 ft.) black minia-
tureshielded two-conductor cable is provided
with a male XLR-type connector. The
RE90BW is provided with a 1.8-m (6 ft.)
whiteminiatureshieldedtwo-conductor cable
with a male XLR-type connector.
Installation and Operation
The RE90B is a boundary style microphone;
thereforethesymmetryandareaofthemount-
ing surface directly affect the sensitivity and
response of the microphones. To mount the
RE90B on a rectangular surface, the micro-
phone should be centered on the surface and
positioned with the front of the microphone
facing the sound source along the longer di-
mension of the mounting surface. Ideally,
the sources of sound should be situated be-
tween the mounting surface and 60 degrees
above the plane of the mounting surface (see
Figure 3).
The RE90B is supplied with a 1.8-m (6 ft.)
miniature shielded cable with a male XLR-
typeconnector. TheRE90B is provided with
theminiature shielded cable connected to the
microphone for temporary installation. For
permanent installation, the cable can be
routed through the bottom of the micro-
phone. A drilling template is provided. The
cable is disconnected from the microphone
by first removing the cross-recessed screw
on the top of the microphone, removing the
protective grille screen and pop filter, then
loosening the three screws on the terminal
block. Whenreattachingtheminiaturecable,
the contacts' functions are printed on the
printed circuit board (see Figure 4).
The RE90B has a balanced low-impedance,
transformerless output. The balanced sig-
nal appears across Pins 2 and 3 while the
RE90B and
RE90BW
Full-Range Condenser
Desk-Mount Microphone
• Nonreflecting black (RE90B) or
low-gloss white (RE90BW).
• Ultra-low profile
• Half-cardioid polar response promotes
excellent gain-before-feedback
• Full, non-slip shock pad electrically
and mechanically isolates case from
mounting surface
• lnternally equalized for natural
response on large surfaces
• Tamper-resistant terminal block
connections for fixed or temparary
applications

RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
2
Figure 1—Frequency Response
ground (shield) connection is Pin 1 (DIN 45
594). The output is phased so that positive
acoustic pressure on the transducer's dia-
phragm produces a positive voltage on Pin 2
in accordance the industry convention.
Architects’ and Engineers’
Specifications
Themicrophone shall be a back-electret con-
denser type with a frequency response of 80
Hz to 15 kHz. The microphone shall have a
half-cardioid pattern with a rear response
which is typically 15 dB below the front re-
sponse at 1.0 kHz. The microphone shall
have an output power level of -33 dB, where
0 dB = 1 milliwatt per pascal, and the output
shall not be appreciably affected by the fol-
lowing temperature and humidity extremes:
-29° to 74° C (-20° to 165° F) when the
relative humidity is 0-50%; -29° to 57° C
(-20° to 135° F) when the relative humidity
is 0-95%. The microphone shall have a
nominal,balancedtransformerlessoutputim-
pedanceof200Ohms. Themicrophoneshall
have a non-reflective black finish (RE90B)
or a non-reflective white finish (RE90BW).
The cable color shall match the body color
of the microphone.
Dimensions of the RE90B shall be 94.1 mm
(3.7 in.) wide, 128.4 mm (5.1 in.) long, and
16 mm (0.63 in.) high; the cable shall be 1.8
m (6 ft) long, 2.6 mm (0.106 in.) in diameter
and terminated in a black, non-reflecting
male XLR-type connector. Termination to
the microphone body shall be a terminal
block.
The Electro-Voice RE90B and RE90BW are
specified.
Limited Warranty
Electro-Voice products are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a specified period,
as noted in the individual product-line
statement(s)below, or in the individualprod-
uct data sheet or owner’s manual, beginning
with the date of original purchase. If such
malfunction occurs during the specified pe-
riod, the product will be repaired or replaced
(at our option) without charge. The product
will be returned to the customer prepaid. Ex-
clusions and Limitations: The Limited
Warranty does not apply to: (a) exterior fin-
ish or appearance; (b) certain specific items
described in the individual product-line
statement(s)below, or in the individualprod-
uct data sheet or owner’s manual; (c) mal-
function resulting from use or operation of
the product other than as specified in the
product data sheet or owner’s manual; (d)
malfunction resulting from misuse or abuse
of the product; or (e) malfunction occurring
at any time after repairs have been made
to the product by anyone other than
Electro-VoiceServiceoranyofitsauthorized
servicerepresentatives.ObtainingWarranty
Service: To obtain warranty service, a cus-
tomer must deliver the product, prepaid, to
Electro-Voice Service or any of its autho-
rized service representatives together with
proof of purchase of the product in the form
of a bill of sale or receipted invoice. A list of
authorized service representatives is avail-
able from Electro-Voice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234-6831
or FAX [phone]). Incidental and
Consequential Damages Excluded: Prod-
uct repair or replacement and return to the
customer are the only remedies provided to
the customer. Electro-Voice shall not be li-
ableforany incidental or consequential dam-
ages including, without limitation, injury to
persons or property or loss of use. Some
states do not allow the exclusion or limita-
tion of incidental or consequential damages
so the above limitation or exclusion may not
apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state
to state.
Electro-Voice Wired Microphones are
guaranteed against malfunction from any
causefortwo (2) years from the date of origi-
nal purchase. In addition, the Limited War-
ranty for the acoustic system contained in
these microphones shall apply for the life of
the product, defined as a period of ten (10)
years from the date that the manufacture of
the specific microphone has been discontin-
ued. Any and all active electronics incorpo-
rated in these microphones are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a period of three
(3) years from the date of original purchase.
The Limited Warranty does not extend to
cables, cable connectors, or switches. Addi-
tional details are included in the Uniform
Limited Warranty statement.
For warranty repair or service informa-
tion, contact the service repair department
at: 616/695-6831 or 800/685-2606.
Fortechnical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan-
dard Time.
Specifications subject to change without
notice.
20 30 50 100 200 500 1000 2000 5000 10000 2000
0
FREQUENCY IN HERTZ
RESPONSE IN dB
5 dB

RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
3
Figure 2—Polar Response
Figure 3—RE90B Ideal Working Angle
Figure 4—RE90B Wiring Diagram
Figure 5—RE90B Dimensions
60°
IDEAL
WORKING
ANGLE
94.1 mm
(3.70 in.)
3.3 mm
(0.13 in.)
128.4 mm
(5.1 in.)
16 mm
(0.63 in.)
+_
GROUND BRAID
(PIN 1)
RED WIRE
(PIN 2)
WHITE WIRE
(PIN 3)
+_
5,000 Hz 10,000 Hz
500 Hz 1,000 Hz
5 dB per division

RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone
4
MICROPHONES—Condensers Part Number 534891—9833
600 Cecil Street, Buchanan, MI 49107
616/695-6831, 616/695-1304 Fax
©Telex Communications, Inc. 1998 • Litho in U.S.A.
Specifications
Versions Available:
RE90B
Full-range condenser desk-mount
microphone, black
RE90BW
Full-range condenser desk-mount
microphone, white
Element:
Condenser, back electret
Frequency Response (see Figure 1):
80-15,000 Hz
Polar Pattern (see Figure 2):
half-cardioid (cardioid in hemisphere
above mounting surface)
Sensitivity,
Open-Circuit Voltage:
25 mV/pascal at 1,000 Hz
Power Level at 1,000 Hz (0 dB = 1
mW/pascal):
–33 dB
Clipping Level, 1% THD:
125 dB SPL
Equivalent Noise:
25 dB SPL, (A weighted)
Dynamic Range:
102 dB
Output Impedance, 1 kHz:
200 ohms
Power Requirements:
9- to 52- V dc phantom supply
Current Consumption:
2.5 mA
Polarity:
Positive pressure on the diaphragm
produces positive voltage on output
pin 2 (+)
Environmental Conditions,
Relative Humidity 0-50%:
-29 to 74° C (-20 to 165° F)
Relative Humidity 0-95%:
-29 to 57° C (-20 to 135° F)
Color:
Nonreflecting black or white
Dimensions (see Figure 5),
Width:
94.1 mm (3.7 in.)
Length:
128.4 mm (5.1 in.)
Height:
16 mm (0.63 in.)
Net Weight (with 1.8-m (6 ft) cable
and male XLR connector):
358 g (6.1 oz)
Shipping Weight:
376 g (12.6 oz)
Shipping Weight:
510 g (18.0 oz)