Atlas IED BT720-4 Data Sheet

B Series

4" High Compliance Loudspeaker Transformer/Baffle Assemblies

General Description

Attractive B Series loudspeaker as sem blies combine the sound
performance of a full range 4" high compliance loud speaker with the
job site con ven ience and economy of a factory-assembled loud speaker,
transformer, and baffle. Models incorporate the popular Atlas Sound FC104
high performance loudspeaker, rec og nized for full-range voice and music
reproduction. Unit provides wide-angle sound dispersion to achieve desired
coverage with fewer loud speak ers in distributed systems. Each loud speaker
employs a 10 ounce ceramic magnet and a damped, high-compliance cone
to provide excellent low-frequency reproduction with smooth extended
re sponse. Pack age includes factory-mounted, dual-voltage 25V/70.7V or

70.7V trans former and round or square grille with screw mount or torsion

B161-4

BT720-4

EZB161-4

spring (T) installation where noted. One model is equipped with the
patented EZ-Mount support system. EZB Model is designed for application
in suspended ceiling tile installations which do not require a protective
enclosure. As sem blies include pre-mounted EZ brackets which are slotted
to accept EZ mount support rails (provided). Rails attach with wingnuts and
adjust vertically to ac com mo date varying ceiling depth requirements (Note:
No tile bridge is required). All B Series packages are shipped as sembled and
ready for installation.

FC104 Loudspeaker Specifications

Speaker Size 4" (102mm)

V.C. Impedance 8Ω Nominal

Flux Den sity 10,500 Gauss

Sensitivity 94db (1W/1M)

Power Rating 10 Watts Pro gram

Resonance 101Hz

Freq. Response 150Hz –17kHz

Dispersion 135°/ -6db, 2kHz Octave Band

Magnet 10oz. Ceramic

V.C. Diameter 1" (25mm)

Depth 21⁄4"(57mm) (less Transfomers)

Features

• High Compliance 4" Loudspeaker for Full-Range Audio Reproduction in
Background Music and Paging Systems

• Factory-Assembled Loudspeaker Packages Save Time and Money

• Choice of Eight Loudspeaker/Transformer/Baffle Configurations

• Selection Includes Models with Easy-To-Install Torsion Spring Grilles
and Models with The Cost-Efficient, EZ-Mount Installation System

Applications

Save time and money by installing B Series 4" diameter loudspeaker
packages for background music and public address systems wherever
the functional and architectural integrity of an small ceiling assembly
is desirable. Full-range, high-quality sound reproduction is ideal for
professional offices, reception areas, waiting rooms, corridors and
balconies. Choose from 8 factory-assembled loudspeaker/transformer
models with standard baffle or easy-to-install torsion spring grille. For
suspended ceiling installations utilize models with the time saving
EZ-Mount installation system.

©2012 Atlas Sound L.P. All rights reserved. Atlas Sound and Strategy Series are trademarks of Atlas Sound L.P. All other trademarks are the property of their respective owners. ATS001653 RevD 7/12

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone]

AtlasSound.com

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Model Loudspeaker Baffle XFMR Primary Taps Core Size

★

B51-4 4" (FC104) 51-4

LT72

(70.7V/25V)

.25, .5, 1,2, & 4

1

⁄2" X 5⁄8" (13mm X 16mm)

XFMR Freq.

Response

100Hz - 10kHz

(±1.5dB)

Insertion Loss

1.5dB 81-4, 76-4 (EZ)96-4, (EZ)96-4

Tile Bridge / Drywall Trim Ring

(Order Seperately)

Enclosure/

Mounting Ring

B161-4 4" (FC104) 161-4

EZB161-4 4" (FC104) T161-4

BT720-4 4" (FC104) T720-4

★

BT720-4-T47 4" (FC104) T720-4 HT47(70.7V) .5, 1,2, & 4

★

FA81-6 Tile bridge may be used in conjunction with E410 or E410-11 (non EZ version) enclosures for drop tile applications

LT72

(70.7V/25V)

LT72

(70.7V/25V)

LT72

(70.7V/25V)

.25, .5, 1,2, & 4

.25, .5, 1,2, & 4

.25, .5, 1,2, & 4

1

⁄2" X 5⁄8" (13mm X 16mm)

1

⁄2" X 5⁄8" (13mm X 16mm)

1

⁄2" X 5⁄8" (13mm X 16mm)

1

⁄2" X 5⁄8" (13mm X 16mm)

100Hz - 10kHz

(±1.5dB)

100Hz - 10kHz

(±1.5dB)

100Hz - 10kHz

(±1.5dB)

60Hz - 12kHz

(±1dB)

Baffle Mounting Guide for B Series

Model Enclosure Mouting Ring Title Bridge

B51-4

B161-4

BT720-4

BT720-4-T47

Architect and Engineer Specifications

(EZ)96-4, (EZ)96-4X 76-4 81-4, 76-4

––– ––– 198-4, SE198-4

PR411 FA81-4

E410(-11),

E410NK, EZE410

(EZ)E410*, E410-11* FA81-4 PR411, TR411

1.5dB

1.5dB

1.5dB PR411, TR411 (EZ)E410*, E410-11*

1.5dB PR411, TR411 (EZ)E410*, E410-11*

Not Required (EZ Mounting

N/A

rail system is included)

198-4**, SE198-4

N/A

Loudspeaker package shall be Atlas Sound Model ____ (B51-4,
B161-4, EZB161-4, BT720-4, BT720-4-T47) or approved equal.

Factory assemblies shall be comprised of an Atlas Sound Model FC104,
4" high compliance loudspeaker or FA134, 4" coaxial loudspeaker,
25V/70.7V or 70.7V transformer and baffle.

Models including high compliance Model FC104 Loudspeaker shall have
wide angle sound distribution with 135° dispersion (-6dB, 2kHz octave
band). The cone shall be a damped, high compliance type with smooth
extended response over a range of 150Hz –17kHz and a power rating of
not less than 10 watts program. The magnet shall be a 10 ounce (283g)
ceramic type. The 1" (25mm) voice coil shall operate in a magnetic field
of at least 10,500 gauss. Voice coil impedance shall be 8Ω. Sensitivity
shall be 94dB [measured 1W/1M]. Free air resonance shall be 101Hz.

Enclosures shall be Model __________ (96-4, 96-4X, 198-4) and shall
be listed by Underwriters Laboratories (UL 1480 General Signaling
and accepted under UL 2043 for use in air handling "plenum" spaces).
Assemblies with support rails shall include pre-mounted brackets and
shall transfer the loudspeaker package weight to the ceiling system
support rails.

©2012 Atlas Sound L.P. All rights reserved. Atlas Sound and Strategy Series are trademarks of Atlas Sound L.P. All other trademarks are the property of their respective owners. ATS001653 RevD 7/12

1601 JACK MCKAY BLVD. ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: [phone]
FAX [phone]

AtlasSound.com

2/2