Electro Voice Microphone RE90B BW User Manual

RE90B/BW  
Full-Range Condenser  
Desk-Mount Microphone  
with XLR Connector  
Key Features:  
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  
Internally Equalized for Natural Response  
on Large Surfaces  
Tamper-Resistant Terminal Block  
Connections for Fixed orTemporary  
Applications  
General Description:  
Technical Specifications:  
Generation Element: Condenser, back electret  
The Electro-Voice® RE90B and RE90BW are part of theArchitectural  
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. The polar  
pattern of the RE90B is half-cardioid (half-space cardioid) to promote  
good gain-before-feedback and suppress ambient noise. 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 pilfer-resistant 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 3.0-m (10 ft.) black miniature shielded two-conductor  
cable is provided with a male XLR-type connector. The RE90BW is  
provided with a 3.0-m (10 ft.) white miniature shielded two-  
conductor cable with a male XLR-type connector.  
Frequency Response: 80 Hz to 15,000 Hz (see chart)  
Polar Pattern: (see chart) Half-Cardioid (Cardioid in hemisphere  
above mounting surface)  
Sensitivity, Open Circuit 25mV/Pascal  
Voltage, 1 kHz:  
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 VDC Phantom Supply  
Current Consumption: 2.5 mA  
Polarity: Positive pressure on the diaphragm  
produces positive voltage on pin 2  
Dimensions: Width = 3.7" (94.1 mm)  
Length = 5.1" (128.4 mm)  
Height = 0.63" (16mm)  
Color: Nonreflecting black or white  
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)  
Net Weight: 12.6 oz. (376 g) with 6' cable and male  
XLR connector  
Shipping Weight: 18 oz. (510 g)  
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