Cobreflex IIB
Folded
Sectoral Horn
General Product Description
The Cobreflex IIB is an exponentially flared, reflex design
for use in public address, paging, and voice warning systems.
This reflex construction results in both compactness and
high efficiency when combined with appropriate compression
drivers.
The patented (patent # 2,751,996) folded design features
two separate air columns in a single assembly that virtually
eliminates high-frequency phase cancellation present in
re-entrant designs.
The 80-degree horizontal by 60-degree vertical dispersion
pattern is beneficial in many applications requiring a wide
coverage pattern. Fur thermore, excellent loading is
maintained to a low-frequency cutoff of 250 Hz.
The Cobreflex IIB is constructed from a high-impact
acrylonitrile butadiene styrene (ABS) with an ultraviolet
inhibiting grey paint 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 reflex type featuring two separate
air columns within the single assembly. It shall produce a
horizontal beamwidth of 80-degrees and a ver tical
beamwidth of 60-degrees at 2 kHz. In addition, it shall
provide useful acoustic loading at all frequencies above 250
Hz.
The horn shall be constructed from a high impact acrylonitrile
butadiene styrene (ABS) and finished with an ultraviolet
inhibiting grey paint.
Specifications:
Horizontal Beamwidth:
80° @ 2 kHz (see Figure 2)
Vertical Beamwidth:
60° @ 2 kHz (see Figure 2)
Directivity Factor R
θ
(Q):
9.1 @ 2 kHz (see Figure 3)
Usable Low-Frequency Limit:
250 Hz
Construction:
High impact acrylonitrile butadiene styrene (ABS) with
ultraviolet light inhibiting grey paint 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"-18 thread.
Dimensions:
Height: .......................................................... 23.5 cm (9.3 in.)
Width: ......................................................... 47.0 cm (18.5 in.)
Depth: ......................................................... 26.0 cm (10.3 in.)
Net Weight:
.............................................................. 2.3 kg (5.1 lb)
Shipping Weight:
..................................................... 3.0 kg (6.7 lb)
Recommended Horns:
ID30C-8
7110XC
ID30C-16
1824S
ID30CT
1828R
ID60C-8
1828T
ID60C-16
1829
ID60T
ID75
COMMERCIAL
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 1.91 cm (0.75 in.) diameter
and shall be provided with a 1 3/8"-18 thread for the mounting
of a compression driver. The horn shall be 23.5 cm (9.3 in.)
high, 47.0 cm (18.5 in.) wide and 26.0 cm (10.3 in.) deep. It
shall weigh no more than 2.3 kg (5.1 lb).
The horn shall be the Cobreflex 11B reflex horn.
