Bosch STH-4R Specsheet
Fire Alarm Systems | STH Series Cluster Horn Loudspeakers
STH Series Cluster Horn Loudspeakers
Multi‑directional sound
▶
Field‑selectable taps from 1 W to 15 W for either
▶
25 VRMS or 70 VRMS
UL‑rated reverberant frequency range from 400 Hz to
▶
4 kHz
Mounts on wall or ceiling
▶
Conduit knockouts for ½‑inch or ¾‑inch couplings
▶
The Wheelock STH Series Cluster Horn Loudspeakers are
designed for high ambient noise environments such as
manufacturing plants, processing plants, and factories.
are
They
horns that meet the requirements of UL1480. Each horn can
deliver up to 102 dB at 15 W at 10 ft (3 m).
available in configurations with two, three, or four
Functions
Sound Settings
Each loudspeaker has a slotted rotating switch used to set
the output decibels. Refer to the installation instructions
packed with the product for specific information about
these settings.
Strobe Option
To provide
can be detached from the enclosure and surface mounted
on a wall, ceiling, or the enclosure using an SBL‑R
Surface‑Mount Back Box with an SHMP‑R Adapter Plate and
an RSSP Series Retrofit Strobe Plate.
Note The RSSP Series Retrofit Strobe Plates can be
a visual indicator, any or all of the loudspeakers
synchronized with each other using an SM or
DSM Synchronization Module or by a
compatible control panel.
Certifications and Approvals
Cooper Wheelock, Inc. holds these Listings and Approvals:
Listings and
Approvals:
Complies with: National Fire Protection Association (NFPA 72 and
UL UUMW: Speakers and Amplifiers for Fire Protective
Signaling Systems (UL1480)
NFPA 101)
Occupational Safety and Health Administration
(OSHA 1910.165)
Installation/Configuration Notes
Compatibility Information
The STH Series Cluster Horn Loudspeakers are compatible
with UL Listed 25 VRMS or 70 VRMS audio systems.
Mounting Considerations
Each of the horns is mounted on a galvanized steel
enclosure measuring 10 in. (25.4 cm) square by 6 in.
(15.2 cm) deep. Mount the enclosure on walls or ceilings
capable of supporting the weight of the cluster assembly.
Use appropriate fasteners.
Note These loudspeakers are for indoor use only and
are not intended for use in wash‑down areas.
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2 | STH Series Cluster Horn Loudspeakers
Wiring Considerations
Each
steel enclosure. Horns can be connected together using the
same wire gauge as the input wire. Refer to the installation
instructions packed with the product for the proper horn
numbering sequence.
is wired to a terminal block inside the galvanized
horn
Parts Included
Quant. Component
1 Cluster assembly
1 Literature pack
Technical Specifications
Audio Characteristics (Individual Horn)
Frequency Response: UL rated at 400 Hz to 4 kHz at 15 W;
400 Hz to 14 kHz anechoic
Sound Dispersion: 70°
Sound Level (peak): 120 dB at 15 W at 1 m
Environmental Considerations
Temperature (operating): -30°F to +150°F (-35°C to +66°C)
Mechanical Properties
Assembly
Color: G‑models: grey; R‑models: red
Weight (approximate): Two‑horn: 14 lb (6.1 kg)
Three‑horn: 19 lb (8.3 kg)
Four‑horn: 23 lb (10.0 kg)
Enclosure
Dimensions: 10 in. (25.4 cm) square by 6 in. (15.2 cm) deep
Material: galvanized steel
Horns
Dimensions (H x W x D): 8.75 in. x 7.9 in. x 9.3 in.
(22.2 cm x 20.0 cm x 23.7 cm)
Material: Aluminum with baked epoxy finish
Power Requirements
Constant Line Voltage: 25 VRMS or 70 VRMS
Power Handling Capacity (RMS): 15 W
Ordering Information
STH‑2G Two‑horn Cluster Loudspeaker
(grey)
Grey, two‑horn cluster loudspeaker for high
ambient noise
capability (25 VRMS or 70 VRMS) and field‑selectable taps from 1 W to 15 W
STH‑2R Two‑horn Cluster Loudspeaker
(red)
Red, two‑horn
bient noise environments with dual voltage capability (25 VRMS or 70 VRMS) and field‑selectable taps from 1 W to 15 W
STH‑3R Three‑horn Cluster Loudspeaker
(red)
Red, three‑horn cluster loudspeaker for high
ambient noise
capability (25 VRMS or 70 VRMS) and field‑selectable taps from 1 W to 15 W
STH‑4R Four‑horn Cluster Loudspeaker
(red)
Red, four‑horn cluster loudspeaker for high
ambient noise
capability (25 VRMS or 70 VRMS) and field‑selectable taps from 1 W to 15 W
Accessories
RSSP‑24MCWH‑FR 24 VDC High‑candela
Retrofit Strobe (red)
VDC
24
tensities of 135 cd or 185 cd
RSSP‑241575W‑FR 24 VDC Fixed‑candela
Retrofit Strobe (red)
24 VDC
viding 75 cd on axis
RSSP‑24MCW‑FR 24 VDC Multi‑candela
Retrofit Strobe (red)
24 VDC
tensities of 15 cd, 30 cd, 75 cd, or 110 cd
RSSP‑121575W‑FR 12 VDC Retrofit Strobe
(red)
12 VDC
viding 75 cd on axis
SBL2‑R Retrofit Device Back Box (red)
dimensions 27.8 cm (10.9 in.) x 15.5 cm
(6.1 in.) x 4.3 cm (1.7 in.)
SHMP‑R Adapter Plate (red)
Red adapter plate
SHMP‑W Adapter Plate (white)
White adapter plate
SM‑12/24‑R Single Synchronization
Module (red)
A 12/24 VDC Cooper Wheelock module that
synchronizes notification appliances on
Class B alarm circuits.
environments with dual voltage
cluster loudspeaker for high am-
environments with dual voltage
environments with dual voltage
retrofit strobe with field‑selectable in-
retrofit strobe listed at 15 cd, but pro-
retrofit strobe with field‑selectable in-
retrofit strobe listed at 15 cd, but pro-
STH-2G
STH-2R
STH-3R
STH-4R
RSSP-24MCWH-FR
RSSP-241575W-FR
RSSP-24MCW-FR
RSSP-121575W-FR
SBL2-R
SHMP-R
SHMP-W
SM-12/24-R
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