Electro-Voice RE90HW technical specifications Frequency Response, Application Notes, Placement

Frequency Response: Polar Response:

Application Notes:

When hanging one or more microphones to provide coverage for a choir, instrumental or theater group, the best microphone position for optimum sound quality and feedback control depends on many factors–sound system characteristics, construction of the auditorium or theater, and the size and nature of the performing group. Two general rules to observe for the best sound coverage are (1) microphone position and (2) the “3-to-1rule.”

The first rule is to suspend the microphone approximately two to three feet in front of the first row of performers and two to three feet higher than the heads of the last row of performers. The microphones are usually aimed to point at the last row of performers (see Figure 1). The second rule, the “3- to-1 rule,” should be applied when more than one microphone is required, and their outputs are combined (as with a mixer). Following the 3-to-1 rule avoids the deep voids and dips in frequency response that occur when two or more microphones “see” the same signal from slightly different distances. The 3-to-1 rule is as follows: when multiple microphones are used, place them at least three times as far apart as any one of them is from the nearest sound source. Figure 2 shows a proper application of the 3-to-1 rule. The RE90H/HW may also be used to provide coverage for live theater applications (Figure 3). Most of the action occurs at center stage, so the microphone should be positioned above and pointed to the center of the stage.

Figure 1: Hanging Mic	Figure 2: 3-to-1 Rule	Figure 3: Live Theater
Placement		Placement

Architectural and Engineering Specifications

The microphone shall be a back-electret condenser type with a frequency response of 75 Hz to 15 kHz. The microphone shall have a cardioid polar pattern with a rear response which is typically 15 dB below the front response at 1.0 kHz. The microphone shall have an output level of 20mV/pascal, and 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 relative humidity is 0-95%. Themicrophone shall have a nominal, balanced output impedance of 200 ohms when connected to its electronics module. The microphone shall have a low-gloss black finish (RE90H) or a low-gloss white finish (RE90HW). The cable color shall match the transducer. The transducer shall have a wire hanger for directing the microphone. Dimensions: the transducer shall be 12.7 mm (0.4 in.) wide and 36.8 mm (1.4 in.) long; the cable shall be 7.6 m (25 ft) long and 2.6 mm (0.1 in.) in diameter. The electronics module shall be a metal cylinder 94 mm (3.7 in.) long and 19 mm (0.75 in.) in diameter. Termination to the electronics module shall be a 3-pin male XLR type connector. The Electro-Voice RE90H and RE90HW are specified.

12000 Portland Avenue South, Burnsville, MN 55337 Phone:952/884-4051, Fax:952/884-0043

www.electrovoice.com

© Telex Communications, Inc. 6/2006

Part Number 534912 Rev D

U.S.A. and Canada only. For customer orders, contact Customer Service at:

800/392-3497 Fax: 800/955-6831 Europe, Africa, and Middle East only. For customer orders, contact Customer Service at:

+ 49 9421-706 0 Fax: + 49 9421-706 265

Other International locations. For customer orders, contact Customer Service at:

+ 1 952 884-4051 Fax: + 1 952 736-4212 For warranty repair or service information, contact the Service Repair department at:

800/553-5992 or 402/467-5321 For technical assistance, contact Technical Support at: 800/392-3497 or 952/736-4656

Specifications subject to change without notice.