Electro-Voice Cobreflex III Specifications

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 R (Q):
θ
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.
Sectoral Horm
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.
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
ID30CT 1828C
ID60C-16 1829
ID75
Folded
COMMERICAL
ID30C-16 1824S
ID60C-8 1828T
ID60CT 1829T