Lowell LH-15TA Specifications
Model: LH-15T
LOWELL 15W Re-Entrant Horn
Description
Lowell Model LH15T is a double re-entrant metal horn with a high
efficiency 15W compression driver to achieve clear and understandable voice paging and tone signaling in indoor or outdoor applications. The all-purpose horn is ideal for use where a
weather-resistant speaker is specified for public address and signaling applications that require high intelligibility such as schools,
recreational facilities, warehouses, distribution centers, parking facilities, and commercial buildings of all kinds. Model LH-15T
operates within a frequency range of 400Hz-12kHz (nominal),
650Hz-4.6kHz (+
15W/1M calculation based on power rating and measured sensitivity, 109dB SPL (avg) 1W/1M to provide clear voice communication.
The horn includes a high quality transformer for versatile use in
25V, 70V or 100V distributed applications. Transformer taps are
selected with a screwdriver. Transformer tap selector and screw
terminal connections are located on the rear of the horn in a recessed area with integral strain relief and protective plastic cover.
The horn mounts using a universal, swivel-style bracket for efficient and versatile installation and positioning of the projector. The
mounting bracket base measures 2.875" dia. with three equally
spaced holes (.28" dia.). The horn assembly measures 8.625" dia.
x 9"H x 9.125"L. It is metal and plastic construction with a durable
grey epoxy finish for long service life. The horn assembly weighs
3.6 lbs. and ships ready for installation.
6dB) with a sensitivity of 117.8dB SPL (max)
Model LH-15T
15W general purpose
re-entrant horn.
Features
• Clear and loud paging, music and tone signaling.
• Versatile application in 25V, 70V or 100V systems with built-in
transformer (screwdriver adjustable).
• Weather-resistant assembly suitable for indoor or outdoor use.
• Universal swivel mounting bracket for easy installation and precise adjustment of orientation.
• Easy 2-wire hook-up to rear access screw terminals.
A&E Specifications
The re-entrant horn loudspeaker shall be Lowell Model LH-15T. It
shall be a double re-entrant design with a high efficiency 15W
compression driver, round bell and universal swivel-style base.
Power rating shall be 15 watts continuous. Frequency response
shall be 400Hz-12kHz (nominal), 650Hz-4.6kHz (+6dB) with a
sensitivity of 117.8dB SPL (max) 15W/1M calculation based on
power rating and measured sensitivity, 106dB SPL (avg) 1W/1M.
Dispersion shall be 50 degrees @ 2000Hz (-6dB). Impedance
shall be 5000, 2500, 1300, 666, 333, 89, 45 ohms. The horn shall
include a 25/70/100V transformer with screwdriver selectable taps.
Taps for 25V use shall be: .13, .25, .48, .94, 1.9, 7.5, and 15W.
Taps for 70V use shall be: 1, 2, 3.8, 7.5, and 15W. Taps for 100V
use shall be: 2, 4, 7.7 and 15W. Transformer connections shall be
protected by a plastic cover with strain relief. The horn assembly
shall measure 8.625" dia. x 9"H x 9.125" L and shall be weatherresistant metal and plastic construction with all metal parts painted
in corrosion resistant grey epoxy.
Model No. Description Size Weight
LH-15T 15W Re-entrant Horn 9"H x 9.125"L (8.625" dia.) 3.6 lbs.
Spec No. 2a-402
(rev. 03.25.11)
pg. 1 of 2
©2010 Lowell Manufacturing Company, 100 Integram Dr., Pacific MO 63069. Phone–800.325.9660 Fax—
636.257.6606. Lowell makes every effort to provide accurate information while reserving the right to change
specifications and/or improve manufacturing methods without notification. (lowellmfg.com)
Model: LH-15T
LOWELL 15W Re-Entrant Horn
PERFORMANCE
Power Handling, Nominal 15 watts RMS (nominal) measured per EIA Standard RS 426-B
Sensitivity 117.8dB SPL (max) 15W/1M calculation based on power rating and measured sensitivity, 106dB SPL (avg)
Frequency Response 400Hz-12kHz (nominal), 650Hz-4.6kHz (+
Dispersion Angle 50° @ 2000Hz octave (-6dB)
Impedance 5000, 2500, 1300, 666, 333, 89, 45 ohms
Transformer Taps Screwdriver adjustable: 25V @ .13, .25, .48, .94, 1.9, 7.5, 15W
Connections Screw terminals with provisions for strain relief. Protected by a plastic cover affixed by 2 screws.
PHYSICAL
Dimensions 8.625" (219mm) dia. x 9" (229mm) H x 9.125” (232mm) L
Housing Material Aluminum with ABS plastic terminal cover
Mounting Base 2.875" (73mm) dia. with three equally spaced .187" (4.7mm) holes.
Mounting Bolt Circle 2.25" (57mm)
Net Weight 3.6 lbs. (1.6kg)
Shipping Weight 4.1 lbs. (1.9kg)
1W/1M
6dB)
70V @ 1, 2, 3.8, 7.5, 15W
100V @ 2, 4, 7.7, 15W
SPL vs. Frequency 1W/1M
Low Frequency Protection: The LH-15T is not designed to operate below 300 Hz. Head-
end processing equipment should include a 300 Hz high-pass filter with a roll-off of 6dB
per octave to limit the low frequency input to the horn. If head-end processing is not available, an alternate method of providing low frequency protection for the horn driver is to insert one non-polarized series capacitor at the high side input (terminal B) of each horn. See
the table below for typical protection capacitor values.
Horn Model No. 25 Volt Line 70 Volt Line 100 Volt Line
LH-15T 15 mfd 2 mfd 1 mfd
Polar Data:
1000Hz octave 2000Hz octave 4000Hz octave 8000Hz octave
Connections: Transformer Settings:
Switch Watts Watts Watts
AB
Black
White
A terminal for 2-wire connection is
located on the rear of the horn in a
recessed area with integral strain
relief and protective plastic cover.
Be sure to observe polarity (“–” to
terminal A and “+” to terminal B).
Spec No. 2a-402
(rev. 03.25.11)
pg. 2 of 2
©2010 Lowell Manufacturing Company, 100 Integram Dr., Pacific MO 63069. Phone–800.325.9660 Fax—
636.257.6606. Lowell makes every effort to provide accurate information while reserving the right to change
specifications and/or improve manufacturing methods without notification. (lowellmfg.com)
Position Impedance @ 25V @ 70V @100V
1 5000 .13 12
2 2500 .25 24
3 1300 .48 3.8 7.7
4 666 .94 7.5 15
5 333 1.9 15 DO NOT USE *
6 89 7.5 DO NOT USE * DO NOT USE *
7 45 15 DO NOT USE * DO NOT USE *
8 OFF OFF OFF OFF
* IMPORTANT: Note that switch positions 6 and 7 are not used on 70V applications; and positions 5, 6, and
7 are not used on 100V applications. They exceed the capacity of the driver and transformer and could
damage or destroy the driver and/or amplifier.
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