Electro-Voice Cobreflex III Manuel utilisateur

Cobreflex III

Folded

Sectoral Horm

General Product Description

The Cobreflex III is a folded sectoral, wide-angle horn for

use in public address, paging, and voice warning systems.

This folded sectoral construction results in both compactness

and high efficiency when combined with appropriate

compression drivers.

The patented (patent #4.176.731) folded design features two

separate air columns in a single assembly that virtually

eliminates high-frequency phase cancellation present in

reentrant designs.

The 100-degree horizontal by 60-degree vertical dispersion

pattern is beneficial in many applications requiring a wide

coverage pattern. Furthermore, excellent loading is

maintained to a low-frequency cutoff of 250 Hz.

The Cobreflex III is constructed from a non-resonant glass

fibre reinforced polyester with a self-colored gray finish. A

serrated positive-lock “U” mounting bracket is provided for

maximum mounting flexibility and ease of installation.

Architects’ and Engineers’ Specifications

The horn shall be of the folded sectoral type featuring two

separate air columns within the single assembly. It shall

produce a horizontal beamwidth of 100 degrees and a

vertical beamwidth of 60 degrees at 2.0 kHz. In addition, it

shall provide useful acoustic loading at all frequencies above

250 Hz.

The horn shall be constructed from a non-resonant glass

fibre reinforced polyester and self-finished in an

ultraviolet-inhibiting gray.

Specifications:

Horizontal Beamwidth:

100° @ 2 kHz (see Figure 2)

Vertical Beamwidth:

60° @ 2 kHz (see Figure 2)

Directivity Factor Rθ(Q):

15.9 @ 2 kHz (see Figure 3)

Usable Low-Frequency Limit:

250 Hz

Construction:

Non-resonant glass-fibre reinforced polyester

compression molding with self-colored gray finish.

Positive-lock painted steel U-bracket.

Mechanical Construction of Driver:

Threaded metal throat insert to accommodate a screw-in

driver with a throat opening of 0.7-inch to 1.0-inch

diameter and a standard 1 3/8-inch thread.

Dimensions:

Height: .............................................. 36.8 cm (14.5 in.)

Width: ............................................... 69.2 cm (27.5 in.)

Depth: ............................................ 38.1.0 cm (15.0 in.)

Net Weight: ................................................... 3.2 kg (7.0 lb)

Shipping Weight: ....................................... 4.5 kg (10.0 lb)

Recommended Horns:

ID30C-8 7110XC ID30C-16 1824S

ID30CT 1828C ID60C-8 1828T

ID60C-16 1829 ID60CT 1829T

ID75

COMMERICAL

A serrated, positive-lock “U” mounting bracket shall be affixed

to the bell by self-locking nuts and shall provide orientation

adjustment in all three planes.

The horn shall possess a throat of 2.54-cm (1.00 in.) diameter

and shall be provided with a 1 3/8"-18 thread for the mounting

of a compression driver. The horn shall be 36.8 cm (14.5 in.)

high, 69.9 cm (27.5 in.) wide and 38.1 cm (15.0 in.) deep. It

shall weight no more than 3.2 kg (7.0 lb).

The horn shall be the Cobreflex III folded sectoral horn.

CA-

Part Number 38109-858 Rev A

U.S.A. and Canada only.

For customer orders, contact the Customer Service department at

800/392 3497 Fax: 800/955 6831

For warranty repair or service information, contact the Service

Repair department at 800/685 2606

For technical assistance, contact Technical Support at 866/78 AUDIO

Please refer to the Engineering Data Sheet for warranty information.

Specifications subject to change without notice.

Polar Response

The directional characteristics of the Cobreflex III, with driver

attached, were measured by running a set of polar responses, in a

large anechoic chamber, at each one-third-octave center frequency.

The test signal was one-third-octave pseudorandom pink noise

centered at the indicated frequencies. The measurement

microphone was placed 6.1 m (20 ft.) from the horn mouth, while

rotation was about the waveguide geometric apexes. These apexes

of rotation are quite close to the apparent (acoustic) apexes across

the frequency range of measurement. Errors attributable to the slight

differences between the geometric and acoustic apexes are reduced

to an inconsequential level by the relatively long, 20-foot measuring

distance. The horn was suspended freely with no baffle. The polar

Figure 1.

Cobreflex III Beamwidth vs. Frequency

Figure 2.

Cobreflex IIB Polar Response

Figure 3.

Cobreflex III Directivity Factor

and Directivity Index vs. Frequency

plots shown in Figure 2 display the results of these tests.The center

frequency is noted on each plot. The wider plot on each chart is the

horizontal polar (–) and the narrower plot is the vertical polar

(– – –).

Beamwidth

A plot of the Cobreflex III’s 6-dB-down total included beamwidth

angle is shown in Figure 1 for each one-third-octave center

frequency.

Directivity

The axial directivity factor Rθ(formerly Q) of the Cobreflex III horn

was computed at each one-third-octave center frequency from the

horizontal/vertical polars and is displayed in Figure 3.

USA 12 Portland Ave South, Burnsville, MN 55337, Phone: 952-884-4 51, FAX: 952-884- 43

Canada 7 5 Progress Avenue, Unit 46,Scarborough, Ontario, Canada, M1H2X1,Phone: 416-431-4975, 8 -881-1685, FAX: 416-431-4588

Switzerland Keltenstrasse 11, CH-2563 IPSACH, Switzerland, Phone: 41/32-331-6833. FAX: 41/32-331-1221

Germany Hirschberger Ring 45, D94315, Straubing, Germany, Phone: 49 9421-7 6 392, FAX: 49 9421-7 6 287

France Parc de Courcerin, Alle Lech Walesa, Lognes, 77185 Marne La Vallee, France, Phone: 33/1-648 - 9 , FAX: 33/1-648 -4538

Australia Unit 23, Block C, Slough Business Park, Slough Avenue, Silverwater, N.S.W. 2128, Australia, Phone: 61/2-9648-3455, FAX: 61/2-9648-5585

Hong Kong Unit E & F, 21/F, Luk Hop Industrial Bldg., 8 Luk Hop St., San PO Kong, Kowloon, Hong Kong, Phone: 852-2351-3628, FAX: 852-2351-3329

Japan 2-5-6 Izumi, Suginami-ku,Tokyo, Japan 168, Phone: 81-3-3325-79 , FAX:81-3-3325-7789

Singapore 3 15A Ubi Rd 1, 5-1 , Kampong Ubi Industrial Estate, Singapore 4 87 5, Phone: 65-746-876 , FAX: 65-746-12 6

Mexico Av. Parque Chapultepec #66-2 1, Col. EI. Parque Edo. Mex. 5339 , Phone: (52) 5358-5434, FAX: (52) 5358-5588

UK 4, The Willows Centre, Willow Lane, Mitcham, Surrey CR4 4NX, UK, Phone: 44 181 64 96 , FAX: 44 181 646 7 84

Africa, Mid East 12 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7424, FAX: 952-887-9212

Latin America 12 Portland Ave South, Burnsville, MN 55337, Phone: 952-887-7491, FAX: 952-887-9212

www.electrovoice.com • Telex Communications, Inc. • www.telex.com

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