background image

Description

The Electro-Voice FRX-940 is a two-way,

high-efficiency, horn-loaded speaker system

designed for indoor sound reinforcement in

fixed installations such as churches, meeting

halls and auditoriums.  Capable of producing

sound pressure levels (SPL) in excess of 124

dB at 1 meter, the FRX-940 will give full-

bandwidth reproduction without sacrificing

sonic quality.  The FRX-940 features a

90

°

 x 40

° 

horn.  The DH2T compression driver

provides smooth, extended response to 20 kHz

and features a titanium diaphragm and a unique

convex-drive Time Path™ phasing-plug struc-

ture (U.S Patent #4,525,604).

The optimally vented bass section of the

FRX-940 is designed using Theile-Small pa-

rameters for efficient performance to below

50 Hz and utilizes a 400-watt DL15-FRX

15-inch woofer to provide high excursion with

low coloration.

The FRX-940 is provided with a passive cross-

over which features 12-dB/octave slopes  cen-

tered acoustically at 1,800 Hz and EV’s self-

resetting PRO™ circuit to guard the compres-

sion driver against damage.  The system can

be easily converted to be operated in the biamp

mode by removing the input-panel assembly

(eight screws) and moving the four jumpers

as indicated on the crossover.  When used in

biamp mode the woofer uses pins 1+ and 1–

and the tweeter uses pins 2+ and 2–.

The enclosure is constructed from seven-ply

plywood and is available in three alternative

finishes; FRX-940 BLK (black textured paint),

FRX-940 UN (unfinished and ready to stain)

and FRX-940 WH (white textured paint).

The grille is constructed from 16-gauge

powder-coated steel and is backed with foam.

Ring-Mode Decoupling (RMD™)

The FRX-940 controls both acoustical and

mechanical ring modes to provide dramati-

cally increased intelligibility, using tech-

niques learned from the development of the

Electro-Voice X-Array™ concert speakers.

There is much less coloration of the sound

from resonating sources, leaving only the

intended sound to be heard by the audience.

Frequency Response

The FRX-940 axial frequency response was

measured in Electro-Voice’s large anechoic

chamber at a distance of 10 feet with a swept

sine-wave input (see Figure 1). The response

curves show response with the passive cross-

over and with the FRX-940 in the biamped

mode with presets for the Electro-Voice

DX34A digital loudspeaker processor. On

Axis, one watt calculated using E

z

/Z

min

, 3.16-

meter measurement distance referred to one

meter.

Directivity

The directional characteristics of the FRX-940

were measured in Electro-Voice’s large

anechoic chamber. The test signal was one-

third-octave filtered pink noise at the frequen-

cies indicated. A full spherical measurement

system was used. All directional information

was measured at 20 feet.

Figure 2 illustrates the horizontal and vertical

polar responses with the internal crossover in

the passive mode.

Figure 3 shows the horizontal and vertical

beamwidths. Beamwidth is the angle at which

the horizontal and vertical polar responses have

decreased in level by 6 dB when compared

with the axial frequency response.

Figure 4 illustrates the total directivity of the

FRX-940. The directivity factor R

θ

(Q) is the

relative value, at a point, of the FRX-940 out-

put when compared to an ideal spherical re-

sponse.  The directivity index, D

i

, is calculated

by D

i

 = 10 log

10

R

θ

.

Power-Handling Test

Electro-Voice components and systems are

manufactured to exacting standards, ensuring

FRX-940

High-Output,
Two-Way,Horn-Loaded
Coaxial Speaker System

• 15-inch woofer
• 90° x 40° coverage
• Vented LF horn design delivers

rated control to 500 Hz

• 400-watts long-term power capacity
• Ring-Mode Decoupling (RMD™)
• Available in black (BLK) unfin-

ished (UN) and white (WH)

• Full-range or biamp operation

with internal passive crossover

• DH2T 1-inch-exit titanium

compression driver

• Built-in L-track rigging

Summary of Contents for FRX-940

Page 1: ...tro Voice X Array concert speakers There is much less coloration of the sound from resonating sources leaving only the intended sound to be heard by the audience Frequency Response The FRX 940 axial frequency response was measured in Electro Voice s large anechoic chamber at a distance of 10 feet with a swept sine wave input see Figure 1 The response curves show response with the passive cross ove...

Page 2: ...ression driver on a fiberglass molded constant direc tivity horn and a dividing network providing an acoustic crossover frequency of 1 800 Hz The system shall be configurable in a biamp mode through internal switches in the cross over network The loudspeaker shall meet the following performance criteria power han dling 400 watts based upon ANSI EIA RS 426 A 1980 standard for full range loud speake...

Page 3: ...oes not apply to burned voice coils or malfunctions such as cone and or coil damage resulting from improperly designed enclosures Electro Voice active electronics associated with the speaker systems are guaranteed for three 3 years from the date of original purchase Additional de Dx34A processor biamp mode Passive crossover tails are included in the Uniform Limited War ranty statement For warranty...

Page 4: ...peaker System FR10 2B SPECIFICATION GRAPHICS FRX 940 High Output Coaxial Speaker System Figure 2 One Third Octave Polar Response anechoic environment with passive crossover long box axis vertical HORIZONTAL VERTICAL 5 dB per Division ...

Page 5: ...FRX 940 High Output Coaxial Speaker System 5 FR10 2B SPECIFICATION GRAPHICS FRX 940 High Output Coaxial Speaker System 5 dB per Division HORIZONTAL VERTICAL ...

Page 6: ... vs Frequency anechoic environment with passive crossover long box axis vertical Figure 4 Directivity vs Frequency anechoic environment with passive crossover Figure 5 Harmonic Distortion 0 1 Rated Power Input 40 watts anechoic environment with passive crossover Fundamental 2nd Harmonic 3rd Harmonic Fundamental 2nd Harmonic 3rd Harmonic ...

Page 7: ...FRX 940 High Output Coaxial Speaker System 7 FR10 2B SPECIFICATION GRAPHICS FRX 940 High Output Coaxial Speaker System Figure 6 Impedance anechoic environment log scale Figure 7 FRX 940 Dimensions ...

Page 8: ... θ θ θ θ Q 500 to 16 000 Hz Median see Figure 4 21 7 21 3 11 1 Directivity Index Di 500 to 16 000 Hz Median see Figure 4 13 4 dB 2 9 dB 3 2 dB Transducer Complement Low Frequency DL15 FRX 15 inch woofer High Frequency DH2T Driver Box Tuning Frequency 65 Hz Crossover Frequency 1 800 Hz acousticaly Crossover Slope 12 dB per octave Impedance Nominal 8 ohms Minimum 5 0 ohms Input Connections Dual barr...

Reviews: