Lowell UNIHORN LUH-15T - Manual (Page 2)

No. i-200
(rev. 02.15.11)
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)
Model: LUH-15T
INSTRUCTIONS: UNIHORN ® LUH-15T
Transformer adjustment
from front.
Model No. LUH-15T
Power Rating: 15W
Frequency Response: 740Hz - 7.4kHz +/- 6dB
Dispersion: 80˚
SPL: 105dB 1W/1M, 101dB 15W/10-ft.*,
106dB 15W/10-ft.**
Calculated Max SPL: 116.8dB 15W/1M
Impedance: OHMS: 5000, 2500, 1300, 666, 333,
89, 45
Power Taps: 25V@ .48, .94, 1.8, 7.5, 15W
70V@ .9, 1.8, 3.8, 7.5, 15W
Size: 7.1" rear dia., 8" face dia., 3.72"D,
9.6" dia. grille
* UL measured A weighted reverberant room sound power output
** 3dB increment rating with a sweep sine-wave signal source - flat weight SPL meter.
Transformer Settings:
Transformer adjustment from
rear (under rubber plug).
Switch Watts@ SPL@10ft. Watts@ SPL @10-ft
Position Impedance 70V 70V 25V 25V
1 5000 0.9 90dB † 94dB* NOT USED ---
2 2500 1.8 94dB † 97dB* NOT USED ---
3 1300 3.8 97dB † 100dB* 0.48 86dB † 91dB*
4 666 7.5 99dB † 103dB* 0.94 91dB † 94dB*
5 333 15 101dB † 106dB* 1.8 93dB † 97dB*
6 89 DO NOT USE** --- 7.5 99dB † 102dB*
7 45 DO NOT USE** --- 15 101dB † 105dB*
* 3dB increment rating with a sweep sine-wave signal source flat weight SPL meter.
** Note switch positions 6 and 7 ARE NOT USED on 70V applications. They exceed the
capacity of the driver and transformer and could damage or destroy the driver and/or amplifier.
† UL measured A weighted reverberant room sound power output.
Mounting Clamps: LUH-15T ships with screwdriver-adjustable clamps.
Connections: Specifications:
REAR CONNECTION
Three adjustable
clamps swing out
to provide labor-
saving installation.
Two-wire connection
secures through a
metal clamp.
Rear-access transformer
taps are protected by a
rubber plug.
Model LUH-15T ships ready for
hookup with a 2-conductor cable
exiting through a rear cable clamp.
CLAMPS (as shipped): The out-of-box position of clamps will
accept depths of 0–1.5" (approx).
CLAMPS (reversed): The clamp position can be reversed by
installer to accept depths of 1"–2.125" (approx).
HORN ASSEMBLY
with trim ring/grille.
HORN ASSEMBLY
without trim ring/grille
Installed depth is less with the trim ring/grille as the
trim ring overlaps and extends beyond horn face.
7.1" housing
7.25" cutout
3.72"
Transformer is
adjustable on
front and rear.
8.0"
9.6"
3.3"
0.77"
7.1" housing
7.25" cutout
Black White stripe
For supervised system applications, the LUH-15T is equipped
with an internal series connected 250V DC blocking capacitor (10
uf NP) with maximum supervisory voltage of 100VDC. Connec-
tions for supervised systems typically utilize an “in/out” wiring
scheme to maintain supervision on all wiring external to the loud-
speaker connections. Requires removal of rear cover to access
loudspeaker terminals.
From previous
speaker or amplifier.
To next speaker or
end-of-line resistor.