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Six
8" Loudspeakers with Single Voice Coil
UHT Series
. High-quality 8" ceiling or wall-mount loudspeakers for use in fire protective signaling, emergency alarm
and audio evacuation systems are available with single voice coil, factory-mounted 5 watts multi-tapped transformer
and two baffle styles to accommodate varying code and aesthetic requirements.
UHT Series
loudspeakers have a
single 1" diameter voice coil, choice of 70.7V or 25V transformer, and DC blocking capacitor. All units are shipped
pre-assembled to reduce installation labor, time and expense. Loudspeakers are equipped with a molded, fire-retar-
dant, moisture-proof cone with whizzer and 10 oz ceramic magnet to deliver smooth frequency response with high
intelligibility and minimal distortion. Transformer has a core size of
1
⁄
2
" x
5
⁄
8
" (13 mm x 16mm) and insertion loss of 1.5
dB. All models terminate with 6" color-coded leads. UL Listed loudspeaker packages must be used with UL Listed
enclosures indicated to maintain UL Listed status. Listed under UL Standard 1480—Speakers for Fire Protective
Signaling Systems. As always, confirm specifications with local building codes.
Model
Series
UL
Size
Magnet
Frequency
Response
Power
Rating
Impedance
Flux
Density
Sensitivity
UHT
1480*
8"
(203 mm)
10 oz
(283 g)
85 Hz – 8 kHz
±5 dB
10 watts
8
Ω
10,600
Gauss
97 dB
(1 W / 1 M)
* UL Ratings measured per UL Standard 1480 at 1 watt, 10 ft. (3 dB increment rating): UHT = 81 dB. Dispersion: 160˚ @ 2 kHz.
Model
Speaker / Transformer /
Cap / Baffle
UL
Transformer
Transformer
Taps
DC Blocking
Capacitor
Baffle
Type*
Mounts Enclosure*
(Order Separately)
UHT25C-U51-8
1480
25V
1
⁄
2
, 1, 2, 5
10 mfd @ 50V
51-8
(Round)
95-8, 96-8
UHT25C-U161-8
UHT70C-U51-8
1480
70.7V
4 MD @ 150V
161-8
(Square)
198-8, SE175-4
UHT70C-U161-8
* Baffle specifications are listed under the corresponding model number, less "U" Prefix, in Sec. 3.Fire protective signaling (1480) when
used in combination with a UL listed enclosure and baffle.
Emergency Signaling Loudspeakers
UHT Series
51-8
161-8
95-8
96-8
198-8