Lowell LH-30T Specifications
Model: LH-30T
LOWELL 30W Re-Entrant Horn
Description
Lowell Model LH30T is a double re-entrant metal horn with a high
efficiency 30W 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-30T operates within a frequency range of 350Hz-7kHz (nominal), 480Hz-
3.3kHz (+
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 11" dia. x
10.5"H x 10.25"L. It is metal and plastic construction with a durable
grey epoxy finish for long service life. The horn assembly weighs
5.1 lbs. and ships ready for installation.
Features
• Clear and loud paging, music and tone signaling.
• Versatile application in 25V, 70V or 100V systems with built-in
• Weather-resistant assembly suitable for indoor or outdoor use.
• Universal swivel mounting bracket for easy installation and pre-
• Easy 2-wire hook-up to rear access screw terminals.
6dB) with a sensitivity of 123.8dB SPL (max) 30W/1M
transformer (screwdriver adjustable).
cise adjustment of orientation.
Model LH-30T 30W
general purpose reentrant horn.
A&E Specifications
The re-entrant horn loudspeaker shall be Lowell Model LH-30T. It
shall be a double re-entrant design with a high efficiency 30W
compression driver, round bell and universal swivel-style base.
Power rating shall be 30 watts continuous. Frequency response
shall be 350Hz-7kHz (nominal), 480Hz-3.3kHz (+6dB) with a sensitivity of 123.8dB SPL (max) 30W/1M calculation based on power
rating and measured sensitivity, 109dB SPL (avg) 1W/1M. Dispersion shall be 45 degrees @2000Hz (-6dB). Impedance shall
be 2500, 1300, 666, 333, 167, 89, 45 ohms. The horn shall include a 25/70/100V transformer with screwdriver selectable taps.
Taps for 25V use shall be: .25, .48, .94, 1.9, 3.7, 7.5, and 15W.
Taps for 70V use shall be: 2, 3.8, 7.5, 15, and 30W. Taps for 100V
use shall be: 4, 7.7, 15, and 30W. Transformer connections shall
be protected by a plastic cover with strain relief. The horn assembly shall measure 11” Dia. x 10.5” H x 10.25” L. and shall be
weather-resistant metal and plastic construction with all metal
parts painted in corrosion resistant grey epoxy.
Model No. Description. Size Weight
LH-30T 30W Re-entrant Horn 10.5"H x 10.25"L (11" dia.) 5.1 lbs.
Spec No. 2a-401
(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-30T
LOWELL 30W Re-Entrant Horn
PERFORMANCE
Power Handling, Nominal 30 watts RMS (nominal) measured per EIA Standard RS 426-B
Sensitivity 123.8dB SPL (max) 30W/1M calculation based on power rating and measured sensitivity 1W/1M, 109dB
Frequency Response 350Hz (nominal), 480Hz-3.3kHz (+
Dispersion Angle 45° @ 2000Hz octave (-6dB)
Impedance 2500, 1300, 666, 333, 167, 89, 45 ohms
Transformer Taps Screwdriver adjustable: 25V @ .25, .48, .94, 1.9, 3.7, 7.5, 15W
Connections Screw terminals with provisions for strain relief. Protected by a plastic cover affixed by 2 screws.
PHYSICAL
Dimensions 11" (279mm) dia. x 10.5" (267mm) H x 10.25” (260mm) L
Housing Material Cast 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 5.1 lbs. (2.4kg)
Shipping Weight 5.8 lbs. (2.6kg)
SPL (avg) 1W/1M
6dB)
70V @ 2, 3.8, 7.5, 15, 30W
100V @ 4, 7.7, 15, 30W
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-30T 30 mfd 4 mfd 2 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).
Position Impedance @ 25V @ 70V @100V
1 2500 .25 24
2 1300 .48 3.8 7.7
3 666 .94 7.5 15
4 333 1.9 15 30
5 167 3.7 30 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.
Spec No. 2a-401
(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)
Loading...