Voice / Tone™ Emergency Loudspeakers
15 Watt Compression Driver Loudspeakers
VT Series / VTF Series Patented and the proven performance standard around the world for effective sound and
electronic signal transmission of emergency voice communications and tone signaling. Cost-effective series function
as protective warning devices in intercom systems and as communication system loudspeakers in multi-occupancy
and expanded space areas including high-rise residences, public buildings, health-care and educational facilities,
banks, shopping areas, distribution centers, and transportation terminals. High-efficiency compression driver provides
optimum acoustic conversion efficiency. Die-cast water sealed construction withstands vandalism, vermin, moisture,
corrosion, and vibration.
Both the VT Series and VTF Series include a 70.7V or 25V transformer model. All Models include a 5 mfd capacitor. VT Series are surface mounting units measuring 41⁄4" Square x 31⁄4" Depth. VTF Series are recessed mounting
versions measuring 6" Square x 31⁄4" Depth. Both series install to a 21⁄8" Depth x 4" E.O. Box (not included); VTF Series
also requires Model A-R adapter ring. Models are available with choice of finish Red(R) or Neutral Gray(N). When used
with compatible control equipment all models comply with UL Standard 1480 — Speakers for Fire Protective Signaling
Systems.
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Model UL Transformer Power Taps
VT-157UCN
VT-157UCR
VTF-157UCN
VTF-157UCR
VT-152UCN
VT-152UCR
VTF-152UCN
VTF-152UCR
* 3 dB increment rating.
1480 70.7V 2, 4, 8, &
1480 25V 2, 4, 8, &
(Watts)
15 watts
15 watts
Frequency
Response
600 Hz - 5500 Hz
(±5 dB)
Dispersion Sensitivity
>190˚
(-6dB point,
1 and 2 kHz
octave bands)
96.9 dB
(1 W / 1 M)
UL: 90 dB*
(1 W / 1 M)
2 Watt Re-Entrant Cone Loudspeakers
SVT-27UCS Surface mount unit features a cone loudspeaker with integral re-entrant protective dome built into the
housing for environment resistance, optimum power output and high intelligibility. Space-efficient design is recommended for use in demanding localized area emergency communications, electro-acoustic signaling, commercial
sound, and intercom applications 2 watt power handling designed for low ambient areas including executive offices,
condominiums, apartments, dormitory rooms, motel/hotel rooms, hospital suites, and elevator cabs. Includes 70.7V
transformer and 1-mfd DC blocking capacitor. SVT-27UCS is a surface mount 41⁄4" Square x 31⁄8" Deep unit designed
for installation in standard 4" square E.O. Boxes (not included). Weather sealed housing is Noryl® plastic. Neutral Gray
finish. When used with compatible control equipment, SVT Series comply with UL Standard 1480—Speakers for Fire
Protective Signaling.
VT Series
VTF Series
Model Frequency
SVT-27UCS
** 3 dB increment rating.
Response
500 Hz -5000 Hz (±5 dB) >190˚ (-6 dB point, 1 and 2 kHz octave bands) 96.9 dB (1 watt, 1 meter)
800.876.3333
Dispersion Sensitivity
UL: 90 dB (1 watt, 10 ft)**
SVT Series
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Installation Accessories for Voice / Tone™ Loudspeakers
SE Surface-mounting outdoor backbox provides weatherproof installation of VT Series / SVT Series loudspeakers.
41⁄4" Square x 2" Depth housing is die-cast zinc with epoxy finish. Unit is tapped for 1⁄2" conduit and includes weatherproof gasket. Suffix model with choice of color. Red(R) or Neutral Gray(N).
SI Surface-mounting indoor backbox for VT Series / SVT Series loudspeakers mounts to any single or double-gang
backbox for concealed conduit installation. 4" Square x 11⁄2" Depth CRS unit is finished in baked epoxy and includes 1⁄2"
conduit knockouts.
Suffix model with choice of color. Red(R) or Neutral Gray(N).
TVTA
F-P
A-R
M-R
SE
SFP
SFP Semi-flush, 6" Square adapter plate mounts behind VT Series / SVT Series loudspeakers to cover any recessed
4" Square x 21⁄8" Depth outlet box. CRS wall plate is stamped and painted.
Suffix model with choice of color: Red(R) or Neutral Gray(N).
Dimensions: 6" Square x 7⁄32" Depth.
TVTA Twin housing for bi-directional mounting of two independently powered VT Series or SVT Series loudspeak-
ers. Ideal for wall or ceiling installation in corridors and walkways. Each unit includes 23⁄4" deep housing with base and
SI
adapter plate for parallel mounting to any electrical backbox.
Suffix model with choice of color: Red(R) or Neutral Gray(N).
F-P Flush adapter plate for VTF Series loudspeakers provides for recessed mounting to 411⁄16" backboxes or solid
exterior and hollow interior wall surfaces where a backbox is not required. CRS stamped construction.
A-R Adapter ring for recessed mounting of VTF Series loudspeakers. Welded steel collar is 2" deep to provide neces-
sary extension to any 4" Square x 21⁄8" Depth E.O. box. Includes four "S" clips.
Finished in Neutral Gray.
M-R Mounting ring with clips for recessed mounting of VTF Series / SVTF Series loudspeakers. Welded steel ring is
2" deep to provide extension to any 411⁄16" Square x 21⁄8" Depth backbox.
Finished in Neutral Gray.
Note: Accessories are also ideal for application with WPVT Series Weatherproof Intercom Stations (Section 8).
Compression Driver Without Housing or Mounting Plate
VTB Series UL recognized compact high-efficiency Voice / Tone™ compression drivers are designed for custom
installation in high-efficiency industrial communication, intercom, electronic alarm, and monitoring system applications including correctional facilities, transportation vehicles, construction sites, and drive-in menu boards. Models
include integral exponential sound projector to provide reliable sound distribution and optimum intelligibility for the
reproduction of voice and/or electronic tone signals. Die-cast zinc construction with water sealed driver will withstand
moisture, corrosion, vibration, vermin, and vandalism. Models are available with a selection of multi-tap transformers
and are designed to mount a variety of standard or custom housings and face plates to meet installation and application requirements. All VTB Series qualify as a UL 1480 recognized component.
VTB Series
Model Power Taps Frequency Response Sound Level* Dispersion Impedance
VTB-1
VTB-2
VTB-4
VTB-6
* Measured at rated power, 1 meter.
** Built-in 70.7V Transformer May be wired with 25V to provide .25, .5, 1, & 2 watt taps.
*** Built-in 25V Transformer
**** Built-in 70.7V Transformer May be wired with 25V to provide .125 & .25 watt taps.
15 watts
15 watts 107 dB
2, 4, 8, & 15 watts 107 dB
1 & 2 watts 100 dB
400 Hz – 4 kHz
107 dB
150˚
8 Ω
4 Ω
***
***
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AtlasSound.com
Emergency Signaling Loudspeakers
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-retardant, 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.
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UHT Series
Model
Series
UHT
UL Size Magnet Frequency
1480* 8"
(203 mm)
10 oz
(283 g)
Response
85 Hz – 8 kHz
±5 dB
Power
Rating
10 watts 8 Ω 10,600
Impedance Flux
Density
Gauss
Sensitivity
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
UHT25C-U51-8
UHT25C-U161-8
UHT70C-U51-8
UHT70C-U161-8
UL Transformer Transformer
1480 25V
1480 70.7V 4 MD @ 150V 161-8
Taps
1
⁄2, 1, 2, 5 10 mfd @ 50V 51-8
DC Blocking
Capacitor
Baffle
Type*
(Round)
(Square)
Mounts Enclosure*
(Order Separately)
95-8, 96-8
198-8, SE175-4
* 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.
51-8
161-8
800.876.3333
95-8
96-8
198-8
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