Description
The Wheelock STH-15S supervised horn
loudspeakers are equipped with a compression
driver providing up to 15 watts RMS power
handling capability, superior intelligibility and
dispersion to achieve maximum sound projection
and penetration.
Weather-resistant metal construction and reentrant
acoustic path assure protection against water,
humidity and corrosion. The mounting bracket
allows directional sound dispersion via
vertical and horizontal positioning. Provisions are
also included for surface or strap mounting to
pillars and I-beams.
All models include a built-in 25/70 V
transformer featuring a screwdriver adjustable,
7-position watt/impedance selection switch. Wiring
terminals are protected with a vandal-resistant
adapter cover for control equipment utilizing cable
or conduit.
A built-in 5 uF capacitor is provided on both
models for line supervision.
All models meet or exceed the UL Listed
standards for audible signal appliances and
are capable of operating within an ambient
temperature range of 150° F (66° C) to –31° F
(–35° C). Models comply with UL Standard 1480—
Speakers for Fire Protective Signaling Systems and
California State Fire Marshal (Title 19).
Specifications: General
• Disperson angle: 70 Degrees (–6 dB @ 2,000 Hz
octave band)
Specifications: UL Rating
• Power rating: 15 Watt continuous
• Frequency response: 400–4,000 Hz (nominal)
• Sensitivity: 101 dB @ 15 Watts @ 10 ft.
Applications
The Wheelock STH-15S supervised horn
loudspeakers are surface-mounting, high-efficiency
units for life safety and communication system
applications. When used with compatible control
equipment, they provide high-intelligibility voice
reproduction and signal transmission for indoor or
outdoor emergency alarm and protective signaling.
Drawings
Architects and engineers specifications
The supervised horn loudspeaker shall be a STH-15S/STH-15SR or approved equal. The horn shall be weather resistant and constructed of
heavy-gauge, treated aluminum. The horn shall be able to operate within any ambient temperature environment ranging from 150° F (66° C)
to –31° F (–35° C). The horn shall be a double reentrant type with a 15 watt RMS audio power rated compression driver producing a UL rated
101 dB measured at 15 watts at 10 feet. The horn shall have an impedance selection via a 7-position switch of 5554, 2777, 1315, 666, 333,
83 & 42. Power taps shall be available at 0.9, 1.8, 3.8, 7.5 and 15 watts for the 70-volt line; and 0.48, 0.94, 1.8, 7.5 and 15 watts for the 25-volt
line. The frequency response range shall be 400–4,000 Hz. The horn shall have a dispersion of 70 degrees. The horn assembly shall be furnished with a mounting bracket that allows adjustment on either a vertical or horizontal plane with a single locking pin and include provisions
for mounting, banding or strapping. Wiring terminals shall be fully enclosed, and a vandal-resistant adapter cover shall provide connection
protection for cable or conduit. The horn shall be 8.7” W x 9.3” H x 9.4” L (22.1 x 23.62 x 23.9 cm). The horn shall be finished in gray- (STH-15S) or red- (STH-15SR) baked epoxy.
