Electro-Voice RE90B User Manual

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

Description

The Electro-V oice RE90B and RE90BW are
part of the Architectural Microphone Series.
The RE90B is a full-range condenser mi­crophone designed to be used for surface
mounted applications such as distance learn­ing centers, video conferencing systems,
teleconferencing systems, and sound rein­forcements (see Figure 1). The polar pat­tern of the RE90B is half-cardioid (half­space cardioid) to promote good gain-be­fore-feedback and suppress ambient noise
(see Figure 2).

All boundary type microphones operated on
a flat surface are subject to an increase in
sensitivity of the microphone with increas­ing frequency; this is called the baffle ef­fect. To counteract this effect, the RE90B
has been designed with internal equaliza­tion to give the RE90B a flat sensitivity re­sponse. The RE90B is designed to be pow­ered 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 per­manently mounted. Second, the microphone's
miniature cable can be routed directly from
the rear of the microphone, or the cable may
be directed from the bottom of the micro­phone though the table top without exposing
the microphone cable. The microphone cable
is connected to the microphone by a pilfer­resistant internal terminal block. For perma­nent installation, a drilling template is pro­vided.

The RE90B's body is designed as a low-pro­file housing. Both microphones are shock
mounted through a combination of a heavy
diecast case, 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 minia­ture shielded two-conductor cable is provided
with a male XLR-type connector. The
RE90BW is provided with a 1.8-m (6 ft.)
white miniature shielded two-conductor cable
with a male XLR-type connector.

Installation and Operation

The RE90B is a boundary style microphone;
therefore the symmetry and area of the mount-

ing surface directly affect the sensitivity and
response of the microphones. To mount the
RE90B on a rectangular surface, the micro­phone should be centered on the surface and
positioned with the front of the microphone
facing the sound source along the longer di­mension of the mounting surface. Ideally,
the sources of sound should be situated be­tween 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 XLR­type connector. The RE90B is provided with
the miniature shielded cable connected to the
microphone for temporary installation. For
permanent installation, the cable can be
routed through the bottom of the micro­phone. 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. When reattaching the miniature cable,
the contacts' functions are printed on the
printed circuit board (see Figure 4).

The RE90B has a balanced low-impedance,
transformerless output. The balanced sig­nal appears across Pins 2 and 3 while the

RE90B/RE90BW Full-Range Condenser Desk-Mount Microphone

0

ground (shield) connection is Pin 1 (DIN 45

594). The output is phased so that positive
acoustic pressure on the transducer's dia­phragm produces a positive voltage on Pin 2
in accordance the industry convention.

Architects’ and Engineers’
Specifications

The microphone shall be a back-electret con­denser 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 re­sponse 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 fol­lowing 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, balanced transformerless output im­pedance of 200 Ohms. The microphone shall
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.

RE90B/RE90BW Full-Range Condenser Desk-Mount 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-V oice RE90B and RE90BW are
specified.

Limited Warranty

Electro-Voice products are guaranteed
against 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 occurs 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. Ex-
clusions and Limitations: The Limited
W arranty does not apply to: (a) exterior fin­ish or appearance; (b) certain specific items
described in the individual 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 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-Voice Service or any of its authorized
service representatives. Obtaining Warranty
Service: To obtain warranty service, a cus­tomer must deliver the product, prepaid, to
Electro-Voice Service or any of its autho­rized 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 avail­able from Electro-V oice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234-6831
or FAX [phone]). Incidental and
Consequential Damages Excluded: Prod­uct repair or replacement and return to the

customer are the only remedies provided to
the customer. Electro-Voice shall not be li­able for any incidental or consequential dam­ages including, without limitation, injury to
persons or property or loss of use. Some
states do not allow the exclusion or limita­tion 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
cause for two (2) years from the date of origi­nal purchase. In addition, the Limited War­ranty 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 discontin­ued. Any and all active electronics incorpo­rated in these microphones are guaranteed
against malfunction due to defects in mate­rials 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. Addi­tional details are included in the Uniform
Limited Warranty statement.

For warranty repair or service informa­tion, contact the service repair department
at: 616/695-6831 or 800/685-2606.

For technical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan­dard Time.

Specifications subject to change without
notice.

Figure 1—Frequency Response

2

5 dB

RESPONSE IN dB

20 30

100 200 500 1000 2000 5000 10000 2000

50

FREQUENCY IN HERTZ