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INSTALLATION INSTRUCTIONS
MULTI-TONE HORN
Use this product according to this instruction manual. Please keep this instruction manual for future reference.
MODEL NUMBER: MTH-24
GENERAL:
The MTH-24 Multi-Tone Horn is a loud, attention getting alert designed for use in noisy and/or large locations where two different
audible appliances are required at one location.
The MTH-24 functions as a telephone extension alert because it provides a pulsed warble tone (1 second on and 7 seconds off) which
can be activated by a telephone systems interrupted or continuous dry contact closure. Additionally, it functions as an auxiliary alert
because it also provides a steady tone which follows the contact closure of a door/service push-button, time clock, alarm systems, etc.
When both alerting tones are activated, the steady tone will take priority over the warble tone.
If required, the warble tone can be used as the auxiliary alert, and the priority tone can be used as the telephone alert. As shown in
Figure 1, the MTH-24 consists of dual tone generator, amplifier, timer for the warble tone, priority circuit and volume control built-in
to a weather resistant speaker horn for indoor and outdoor use. A Wheelock RPS-2406, 24VDC power supply is included to power
the MTH-24. Multiple units can be connected in parallel where required.
NOTE: All CAUTIONS and WARNINGS are identified by the symbol
. All warnings are printed in bold capital letters.
WARNING: READ THESE INSTRUCTIONS CAREFULLY. FAILURE TO COMPLY WITH ANY OF THE
FOLLOWING 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, SERIOUS INJURY OR DEATH TO YOU AND/OR OTHERS.
TELEPHONE
SYSTEM
DRY
CONTACT
CLOSURE
CONTACT
CLOSURE
DOOR/SERVICE PUSHBUTTON,
TIMECLOCK OR ALARM SYSTEM
RPS-2406
POWER
SUPPLY
Figure 1: Circuit Block Diagram
Copyright 2002 Wheelock, Inc. All rights reserved.
WARBLE
TONE
TIMER
DUAL
TONE
PRIORITY
CIRCUIT
+
-
GENERATOR
VOLUME
CONTROL
MTH-24
AMP
P81543 G
Sheet 1 of 5
Table 1 shows the sound pressure level performance of the MTH-24, and Table 2 provides a guide to horn spacing, area coverage,
and sound pressure level.
Table 1: Sound Pressure Level Performance
Sound Pressure Level (dB at 24 VDC)
Feet On
Axis
Full Power
(10 W)
1/2 Power
(5W)
1/4 Power
(2.5W)
4 115 112 109
8 109 106 103
16 103 100 97
32 97 94 91
64 91 88 85
128 85 82 79
Table 2: Horn Guide
Full Power (10W) Half Power (5W) Quarter Power (2.5W)
Noise
Level
Quiet
50-65dB
Moderate
65-75dB
*Spacing
& Distance
**SPL Area
*Spacing
& Distance
**SPL Area
N/A N/A N/A 120 Ft. 83dB 14,400 Sq. Ft. 120 Ft. 80dB 14,400 Sq. Ft.
110 Ft. 88dB 12,100 Sq. Ft. 110 Ft. 85dB 12,100 Sq. Ft. 110 Ft. 82dB 12,100 Sq. Ft.
*Spacing
& Distance
**SPL Area
90 Ft. 89dB 8,100 Sq. Ft. 90 Ft. 86dB 8,100 Sq. Ft. 90 Ft. 83dB 8,100 Sq. Ft. Noisy
75-85dB
Very Noisy
85-95dB
60 Ft. 92dB 3,600 Sq. Ft. 60 Ft. 89dB 3,600 Sq. Ft. 60 Ft. 86dB 3,600 Sq. Ft.
30 Ft. 98dB 900 Sq. Ft. 30 Ft. 95dB 900 Sq. Ft. 30 Ft. 92dB 900 Sq. Ft.
25 Ft. 100dB 600 Sq. Ft. 25 Ft. 97dB 600 Sq. Ft. 25 Ft 94dB 600 Sq. Ft
16 Ft. 103dB 250 Sq. Ft. 16 Ft. 100dB 250 Sq. Ft. 16 Ft. 97dB 250 Sq. Ft.
* Spacing between horns (side-to-side), and distance in front of horn at which a clear audible tone will be heard.
** Horn sound pressure level (SPL) should exceed the locations noise level by at least 6dB.
SPECIFICATIONS:
Table 3.
Nominal Input Voltage 24VDC
Input Voltage Range 21.6VDC TO 26.4VDC
Input Current at 24VDC with Maximum Volume 0.6A
Sound Pressure Level (On Axis at 24VDC at Full Rated Output) 117dB at 1 Meter
Contact Closure Current Requirement 0.01A
Amplifier Rated Power Output 10 Watts
Speaker Voice Coil Impedance 8 Ohms
Tone Appliances Warble and Single Tone
Operating Duty Cycle See Table 4 and Notes
Table 4: Operating Duty Cycle
Contact Closure Duty Cycle Warble Tone Priority Tone
Continuous
(Minimum 5 Seconds On)
Interrupted
1 Second On
7 Seconds Off
Follows Contact Closure
(See Notes Below)
Follows Contact Closure
(Takes Priority Over Warble Tone)
Follows Contact Closure
(Takes Priority Over Warble Tone)
NOTES:
1) A continuous closure duty cycle is defined as having a minimum "On" time of 5 seconds.
2) Maximum warble tone "on" time, during any "On-Off" cycle
tone will operate as follows:
Interrupted Closure Duty Cycle "On" Time Warble Tone Operation
1 second Follows closure
Less than 1 second Follows closure
More than 1 second (and less than 5 seconds) 1 second on
, is 1 second. For interrupted contact closure duty cycles, warble
Table 5.
P81543 G
Sheet 2 of 5