wheelock STH-15S, STH-15S-1 Service Manual

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Series STH-15S Supervised Horn Loudspeaker

Description

The Wheelock Series 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, vermin 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 25/70/100 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 mfd 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 66°C (150°F) to -35°C (-30°F).
Models comply with UL Standard 1480 — Speakers for Fire
Protective Signaling Systems and California State Fire Marshal

(Title 19).

STH-15S (Gray)

STH-15SR (Red)

SHMP-R Adapter

Plate

Features

• Approvals include: UL Standard 1480 – (Speakers for Fire
Protective Signaling Systems), California State Fire Marshal
(CSFM) Title 19

• Meets or exceeds UL Listed standards for audible signal
appliances

• 15-Watt High Efficiency Compression Driver

• Weather-resistant, vandal-resistant aluminum construction
assures protection against water, humidity, vermin, and corrosion

• Reentrant acoustic path

• 25/70/100 V transformer featuring a screwdriver adjustable, 7­ position watt/impedance selection switch

• 5 mfd Capacitor for Line Supervision

• STH-15S Gray baked epoxy finish

• STH-15SR Red baked epoxy finish

• Simplified, universal-mounting bracket adjustable in horizontal
and vertical planes with banding slots for beam or pillar mounting

• Installation terminals and power selector are recessed mounted,
and protected by the metal interface adapter, or clear plastic
shield

Applications

The Wheelock Series 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.

Specifications and Ordering Information

Model

Number

STH-15S 7937 9” Dia. Supervised, Weatherproof, 15 Watt Horn, Loudspeaker with Transformer, Aluminum, Gray 4.5 lbs. (2.0 kgs.)

STH-15SR 7938 9” Dia. Supervised, Weatherproof, 15 Watt Horn, Loudspeaker with Transformer, Aluminum, Red 4.5 lbs. (2.0 kgs.)

SHMP-R 8154

STH­RSSP-KIT

S2652

Order

Code

6096

151-92-E

Product Description Weight

UL Listed Adapter Plate, Designed to mount the STH-15SR Horn Speaker (7938) to a Series RSSP Strobe
Mounting Plate. For Surface Mount Applications, the SBL-2 (6988) Surface mount backbox is required.

Weatherproof 15 watt supervised 25/70 horn loudspeaker and 15/30/75/110cd strobe with mounting plate,
adjustable mounting base for horn and backbox. Red color.

7320-0785:144

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 66 degrees C (150°F) to -35 degrees C (-30°F). The horn shall be a double reentrant type
with a 15 watt RMS audio power rated compression driver producing a UL rated 102 dB measured at 15 watts at 10 feet.
The horn shall have an impedance selection via a 7 position switch of 5000, 2500, 1300, 666, 333, 89 & 45. Power taps
shall be available at 2.0, 4.0, 7.5 & 15 watts for the 100 volt line, .9, 1.8, 3.8, 7.5 & 15 watts for the 70 volt line and .48,
.94, 1.8, 7.5 & 15 watts for the 25 volt line. Each power tap shall have a 3dB incremental rating. The frequency response
range shall be 400 - 4000 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 7.875” W x 8.75” H x 9.313” D (200 x
222 x 237 mm). The horn shall be finished in gray (STH-15S) or red (STH-15SR) baked epoxy.

WARNING: PLEASE READ THESE SPECIFICATIONS AND INSTALLATION INSTRUCTIONS CAREFULLY BEFORE USING, SPECIFYING OR AP­PLYING THIS PRODUCT. FAILURE TO COMPLY WITH ANY OF THESE INSTRUCTIONS, CAUTIONS AND WARNINGS COULD RESULT IN IMPROPER
APPLICATION, INSTALLATION AND/OR OPERATION OF THESE PRODUCTS IN AN EMERGENCY SITUATION, WHICH COULD RESULT IN PROPERTY
DAMAGE, AND SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.

STH-15S & STH-15SR Power Switch Selections

Setting

Impedance

(Ohms)

1 5,000 0.9W 90 Not Used Not Used 2.0W 93

2 2,500 1.8W 93 Not Used Not Used 4.0W 96

3 1,300 3.8W 96 0.48W 87 7.5W 99

4 666 7.5W 99 0.94W 90 15.0W 102

5 333 15.0W 102 1.8W 93 Not Used Not Used

6 89 Not Used Not Used 7.5W 99 Not Used Not Used

7 45 Not Used Not Used 15.0W 102 Not Used Not Used

70.7 Volts 25 Volts 100 Volts

Watts

dB @

10 Feet

Watts

dB @

10 Feet

Watts

dB @

10 Feet

Specifications (UL RATING)

POWER RATING: 15 Watt Continuous
FREQUENCY RESPONSE: 400-4,000 Hz
SENSITIVITY: 102 dB @ 15 Watts @ 10’

SPECIFICATIONS GENERAL
DISPERSION ANGLE: 70 Degrees (-6 dB @ 2,000 Hz Octave Band)

NOTE: Due to continuous development of our products, specifications and offerings are subject to change without notice in accordance
with Wheelock Inc. standard terms and conditions.

Anechoic Measurements:

15 watt tap @ 10 feet

Code-3 Tone 107.2 dBA

Slow Whoop 108.5 dBA

Siren 107.8 dBA

273 Branchport Avenue
Long Branch, NJ 07740
Phone: [phone]
Fax: [phone]
www.cooperwheelock.com

WE ENCOURAGE AND SUPPORT NICET CERTIFICATION

3 YEAR WARRANTY

Made in USA

S0100 STH 11/06