Lowell LUH-15TX General Signaling Economical Horn Without Grille User Manual
- October 27, 2023
- Lowell
Table of Contents
Lowell LUH-15TX General Signaling Economical Horn Without Grille
I-LUH (Rev. 6/16/22): Instructions for Unihorn™ Models LUH-15TA and LUH-15TX
The Unihorn® is a re-entrant horn engineered for general voice communications
systems. While all Unihorn models feature cast aluminum housing suitable for
indoor or outdoor applications when mounted exposed (without an accessory
backbox), note that some accessories are not suitable for outdoor use.
Note: Either model may also be mounted to most industry standard 8-inch
speaker grilles. That will not void the UL Listing.
MODEL SELECTION
Unihorn Model LUH-15TA offers the greatest flexibility for 25V, 70V, 100V or 8
ohm applications, as it includes a press-fit mesh grille and trim ring that
can be mounted or not, according to the needs of the project. The grille adds
a finished look, while protecting the front of horn from nesting birds and
insects. The housing
features mounting dogs for quick installation.
Includes:
- 15W driver with transformer and tap selector
- Cast aluminum housing with mounting dogs
- Press-fit mesh grille
- Trim ring
Accessories for use with model LUH-15TA — order separately: (see product spec sheets for information)
- Location Application Accessories (required) Accessories (optional)
- Indoor • Exposed • LUH-BRKT (bracket) or custom rigging hardware • LUH-VRG (grille)
- Recessed (existing drywall) —————- • LUH-VRG (grille)
- Recessed (before drywall is installed) • LUH-RIB (rough-in bridge) • LUH-VRG (grille)
- Recessed (drop tile ceiling) • LUH-TBAR (tile bridge) • LUH-VRG (grille)
- Recessed (masonry) • LUH-BOX-INT (backbox) & LUH-TP (trim plate) • LUH-VRG (grille)
- Surface-mount • LUH-BOX-INT (backbox) • LUH-VRG (grille)
- Outdoor • Exposed • LUH-BRKT (U-bracket) or custom rigging hardware • LUH-VRG (grille)
- Recessed (masonry) • LUH-BOX (backbox) & LUH-TP (trim plate) • LUH-VRG (grille)
- Surface-mount • LUH-BOX (backbox) • LUH-VRG (grille)
Unihorn Model LUH-15TX is an economical choice because it does not include the
press-fit grille or trim ring, and the housing does not feature mounting dogs.
It’s made specifically for two types of (25V, 70V, 100V)
applications:
- Installations that plan to mount the horn exposed using the optional U-bracket (order separately).
- Installations that plan to use an existing, industry standard 8-inch grille.
Accessories for use with model LUH-15TX — order separately: (see product spec sheets for information)
INSTALLATION
It is the r of the installer to properly select all hardware for rouging and installation. safety and restraint cables, and to consult a licensed mechanical or structural engineer to evaluate and certify the structural integrity and safety of any mounting method and its suitability for the building structure. Lowell Manufacturing Company its affiliates, employees, and/or independent sales representatives, are not responsible for the use, misuse, misapplication, or unsafe installation of any home or speaker system.
NOTE: To determine speaker spacing, see the technical paper “Distributed System Speaker Spacing for the Integrator” at LowelIMfg.com.An online spacing calculator is also available.
Model LUH-15TA EXPOSED:
-
Open Architecture (with installer-furnished hardware): Use the two threaded 1/4–20 mounting posts (on back of horn) to mount the horn with 1/4-20 threaded rods or bolts, or custom rigging hardware. Tighten the three dog ears to clamp the horn to the trim ring. Press the mesh grille into the ring to fit securely in place.
-
Ceiling or Wall (with LUH-BRKT bracket): Mount the bracket to the surface. Then place the back of the horn through the trim ring and use the two threaded 1/4–20 mounting posts (on back of horn) to mount the horn to the bracket. Tighten the three dog ears to clamp the horn to the trim ring. Press the mesh grille into the ring to fit securely in place.
-
RECESSED: Before mounting the horn in recessed applications, be sure to check for obstructions behind the ceiling or wall. For more information, see the technical paper online at https://www.lowellmfg.com/wp-content/uploads/Checking_above_the_ceiling_before_you_cut.pdf
-
Existing Drywall: Use the inside of the trim ring to trace a 7.25″ diameter mounting hole in the ceiling (or wall). Cut the hole. Place the back of the horn through the trim ring and into the mounting hole, aligning tapped holes on the ring with those in the lip of the horn. Holding the horn flush against the ceiling (or wall), tighten the three mounting dogs to clamp the horn to the ring. Press the mesh grille into the ring to fit securely in place.
-
Drop Tile Ceiling (with LUH-TBAR tile bridge): The tile-bridge distributes the weight of the speaker to the ceiling grid, which will help prevent sagging. Begin by removing the ceiling tile and placing the bridge on the back of the tile to mark where the mounting hole should be cut. Cut the 7.25″ mounting hole, then replace the tile in the ceiling grid with the bridge sitting on top of it. Place the back of the horn through the trim ring and into the mounting hole. Holding the horn flush against ceiling tile, tighten the three dog ears on the back of the horn to clamp it to the trim ring, tile and bridge. Press the mesh grille into the ring to fit securely in place.
• New Construction-
Before Drywall is installed (with LUH-RIB rough-in bridge): Reserve space for the horn by mounting a rough-in bridge to the framing, positioning the bridge so the return lip protrudes into the room. The drywall installer uses the lip as a guide to trace the mounting hole. Be sure to install wiring so it can be accessed when drywall is in place. After drywall is installed and painted, mount the horn by placing the back of it
through the trim ring and into the mounting hole. Holding the horn flush to the ceiling (or wall), tighten the
horn’s three dog ears to clamp it to the bridge and trim ring. Then press the mesh grille into the ring so it
fits securely in place. -
Exterior Masonry (with LUH-BOX backbox and LUH-TP trim plate): Run speaker wire into the backbox, then mount the box in the wall using mortar to hold it in place. After the mortar dries, mount the trim plate
to the front of the backbox using four 8-32 screws (provided). The trim plate is larger than the backbox so
it will cover rough mortar edges. Place the back of horn through the trim ring and into the box. Tighten the
three dog ears to clamp the horn to the backbox and ring. Press the mesh grille into the ring to fit securely in place. -
Interior Masonry (with LUH-BOX-INT backbox): Run speaker wire into the backbox, then mount the box in the wall using mortar to hold it in place. After the mortar dries, mount the trim plate to the front of the
backbox using four 8-32 screws (provided). The trim plate is larger than the backbox so it will cover rough
mortar edges. Place the back of horn through the trim ring and into the box. Tighten the three dog ears to
clamp the horn to the backbox and ring. Press the mesh grille into the ring to fit securely in place.
-
SURFACE-MOUNT:
- Exterior Surface (with LUH-BOX backbox): Run speaker wire into backbox, then mount backbox to surface. Place back of horn through trim ring and into backbox. Tighten three dog ears to clamp horn to backbox and trim ring. Press the fine mesh grille into the trim ring so it fits securely in place.
- Interior Surface (with LUH-BOX-INT backbox): Run speaker wire into backbox, then mount backbox to surface. Place back of horn through trim ring and into backbox. Tighten three dog ears to clamp horn to backbox and trim ring. Press the fine mesh grille into the trim ring so it fits securely in place.
Model LUH-15TX EXPOSED
- Open Architecture (with installer-furnished hardware): Use the two threaded 1/4–20 mounting posts on back of horn to mount horn using 1/4-20 threaded rods or bolts, or custom rigging hardware.
- Ceiling or Wall (with LUH-BRKT bracket): Mount bracket to surface. Use the two threaded 1/4–20 mounting posts on back of horn to mount the horn to bracket.
WIRING & SCHEMATICS
Model LUH-15TA & LUH-15TX: Horn ships with pigtail exiting a waterproof
connector. The red wire is the positive (+) conductor
and the black wire is the negative (–) conductor. The pigtail has been
factory-connected to the 25V/70V/100V input terminals inside of
the termination compartment. A splice can be made to the pigtail, using UL-
approved splice connectors, if the splice is made inside a
UL recognized junction box (ex. Lowell LUH-BOX). If a UL-approved junction box
is not used, the waterproof fitting should be loosened, the pigtail should be
disconnected and removed, the field wiring should be fed through the
waterproof connector, and the termination should be made directly to the input
terminals in the termination compartment. The waterproof fitting should then
be tightened. Note that to maintain a UL-required seal at the waterproof
fitting, the field wiring used must have a round jacket with a diameter of
0.197” to 0.256”.
For 8-ohm connection, remove the jumper on the upper 8-ohm terminal strip, and
terminate the input wiring on the positive (+) and negative (–) 8-ohm
terminals. This bypasses the transformer and selector switch as shown on the
schematic below.
HORN SPECIFICATIONS
- Model No. LUH-15TA and LUH-15TX
- Power Rating (per EIA standard RS 426-B) 15W RMS
- Frequency Response 740Hz–704kHz ± 6dB
- Sensitivity (using 70V inputs) 105dB 1W/1M
- Calculated Max. SPL (based on power rating & measured sensitivity) 116.8dB 15W/1M
- Conical Dispersion 80 degrees @ 2kHZ octave
- Input Impedance (nominal) 5000, 2500, 1300, 666, 333, 133, 89, 45 ohms
- Transformer Power Taps 25V@ .13W, .25W, .50W, 1.0W,1.9W, 4.7W, 7.5W, 15W
- 70V@ 1.0W, 2.0W, 3.8W, 7.5W, 15W
- 100V@ 2.0W, 4.0W, 7.5W, 15W
- Voltage Input 25V, 70V, or 100V selectable taps
PHYSICAL ATTRIBUTES
- Outside Dimensions
- Horn housing …………….. 7.1 in. (180 mm) dia. housing with 8.0 in. (203 mm) dia. face x 3.72 in. (94 mm) depth
- Horn, trim ring, grille …… 7.1 in. (180 mm) dia. housing with 9.6 in. (244 mm) dia. trim ring/grille x 3.30 in. (84 mm) depth x 0.772 in. (19 mm)
- proj.
- Material ………………… Cast aluminum housing with gasketed rear cover; cast aluminum trim ring; perforated aluminum grille
- Mounting Bolt Circle ………. 7.625 in. (194 mm) with 4 holes spaced to mount an E.I.A. 8 in. speaker grille
- Cutout Diameter ……………. 7.25 in. (184 mm)
- Weight ………………… Model LUH-15TA = 4.9 lbs. (2.22 kg)
………………… Model LUH-15TX = 4.1 lbs. (1.86 kg)