SPEAKERS
SF 228T
TWO-WAY SOUNDFIELD CEILING
TILE SPEAKERS WITH 8" WOOFER
AND 70/100 V TRANSFORMER
AA 2' x 2' (61 cm x 61 cm), 18.5 lb (8.4 kg)
drop-in ceiling tile speaker for US style
suspended ceilings
AA UL 2043 plenum rated enclosure
AA 1" (2.5 cm) silk dome tweeter
AA 8" (20.3 cm) long-throw woofer with
tuned bass reflex port
AA Front baffle design reduces unwanted
enclosure resonances
AA Extron-exclusive enclosure weighs
less than 20 pounds (9 kg)
AA White perforated grille matches
appearance of air conditioning vents
AA 8 ohm direct or 70/100 volt operation
AA Frequency range: 50 Hz to 20 kHz
AA 60 watts continuous pink noise,
120 watts continuous program
AA 5.3" (13.5 cm) deep low profile
enclosure for plenum environments
AA 5 year parts and labor warranty
AA Designed and manufactured by Extron
The Extron SF 228T is a two-way ceiling tile speaker that delivers the
full frequency range and sonic performance of a standard freestanding
speaker, in a design optimized for easy installation into suspended ceilings.
It provides extended low frequency reproduction with deeper, more
authoritative bass output than traditional ceiling speakers. The SF 228T is
designed for fast and easy installation into sound systems requiring high
quality, wide bandwidth audio playback.
DESCRIPTION
The Extron SoundField® SF 228T is a two-way ceiling tile speaker for
low impedance and 70 volt/100 volt systems. This Extron-exclusive
design features a low profile, 2' x 2' (61 cm x 61 cm) by 5.3"
(13.5 cm) deep enclosure that is UL 2043 plenum rated, weighs less
than 20 pounds (9 kg), and drops directly into standard US style
suspended ceilings, providing quicker installations. The two-way
ported design includes an 8" (165 mm) woofer and a 1" (2.5 mm)
silk dome tweeter that provides a frequency range of 50 Hz to
20 kHz for high fidelity music and speech reproduction. The SF 228T
offers 60 watts continuous pink noise and 120 watts continuous
program output. This speaker is sold in pairs and is designed for fast
and easy installation into sound systems requiring high quality, wide
bandwidth audio playback.
The SF 228T delivers the full frequency range and sonic performance
of a standard freestanding speaker, in a design optimized for easy
installation into US style suspended ceilings. It provides extended
low frequency response with deeper, more authoritative bass output
than from competitive ceiling speakers. This low frequency extension
is achieved through a long-throw woofer mated to a tuned-port
enclosure, plus a large transformer for distortion-free low frequency
output.
used as a plenum air return for the HVAC system, it is essential that
ceiling speakers have been properly tested and rated for minimal
smoke and heat release in the event of a fire and to comply with
building codes.
UL Listed and Plenum Rated
A UL mark does not guarantee plenum applicability. Extron closed
back ceiling speakers, however, are UL listed indicating they conform
to specified safety standards. The SF 228T is UL 2043 listed for
use in air handling spaces. The SF 228T is also UL 1480 listed
for commercial and professional use. Always check a speaker’s
certification on UL’s Web site, www.ul.com, and use the Online
Certifications Directory tool before you specify it for a plenum ceiling
application.
SPECIFICATIONS
AUDIO/ACOUSTIC AND ELECTRICAL
AA 1" (2.5 cm) silk dome tweeter
Speaker type2-way, full-range, in-ceiling speaker
Frequency range50 Hz to 20 kHz, -10 dB, half space
Power capacity60 W (rms) continuous pink noise (per IEC 60268-5)
120 W (rms) continuous program
Nominal sensitivity89 dB SPL, 1 watt, 1 m, half space
Nominal coverage angle90˚ conical coverage
Nominal impedance8 ohms per speaker
Crossover frequency4.5 kHz
Woofer(1) 8” (203 mm) polypropylene cone with moisture resistant
coating
Tweeter(1) 1” (25 mm) silk dome
Input connectors(1) 10 mm Euro-style captive screw terminal block,
7 pole (for transformer input)
(1) 10 mm Euro-style captive screw terminal block, 2 pole (for direct 8 ohm input)
Tap settings
70 V input32 W, 16 W, 8 W, 4 W, 2 W, null
(bypass 8 ohm direct connection)
100 V inputNull, 32 W, 16 W, 8 W, 4 W, 2 W
(bypass 8 ohm direct connection)
AA 8" (20.3 cm) long-throw woofer with a tuned bass reflex port
GENERAL
AA Front baffle design reduces unwanted enclosure resonances
Package2 speakers (1 pair) with 2’ (61 cm) cross bars
Temperature/humidityStorage: -40 to +158 ˚F (-40 to +70 ˚C) /
10% to 90%, noncondensing
Operating: +32 to +122 ˚F (0 to +50 ˚C) /
10% to 90%, noncondensing
MountingDrops into 2' x 2' (61 cm x 61 cm) or 2' x 4'
(61 cm x 122 cm) suspended tile ceilings
Enclosure typeComposite, square, with metal grille
Enclosure outer dimensions5.3" H x 23.75" W x 23.75" L
(13.5 cm H x 60.3 cm W x 60.3 cm L)
Product weightSingle: 18.5 lbs (8.4 kg)
Shipping weightPair: 45 lbs (21 kg) with mounting kit
VibrationISTA 1A in carton (International Safe Transit Association)
Regulatory compliance
SafetyCE, NFPA90A, NFPA70;
UL Listed for use in plenum airspaces: meets UL 2043 for
heat and smoke release, meets UL 1480 for commercial
and professional audio systems
EnvironmentalComplies with the appropriate requirements of RoHS, WEEE
Warranty5 years parts and labor
NOTE: All nominal levels are at ±10%.
For easy installation, the SF 228T drops into the same space as a
standard 2' x 2' tile, and includes a T-bar for 2' x 4' ceilings. It also
provides theft deterrence with a neutral white, perforated steel grille
that matches the appearance of standard air conditioning vents and
grid ceilings.
KEY FEATURES
AA 2' x 2' (61 cm x 61 cm), 18.5 lb (8.4 kg) drop-in ceiling tile
speaker designed for US style suspended ceilings
AA UL 2043 plenum rated enclosure
AA Extron-exclusive enclosure weighs less than 20 pounds (9 kg)
AA White perforated grille matches appearance of air
conditioning vents
AA 8 ohm direct or 70/100 volt operation with selectable
power taps
AA Frequency range: 50 Hz to 20 kHz
AA 60 watts continuous pink noise, 120 watts continuous
program
AA 5.3" (13.5 cm) deep low profile enclosure for plenum
environments
AA 5 year parts and labor warranty
AA Designed and manufactured by Extron
Does Your Ceiling Speaker Really Meet UL Standards?
Not all ceiling speakers on the market are UL listed. Those that
are may be listed for commercial and professional use, but do not
have the appropriate UL rating for installation and use in a plenum
airspace. Because the space above a suspended tile ceiling is often
Model
SF 228T
Version Description
Ceiling - 2x2 Drop-In, Transformer, Pair
Part number
42-168-03
For complete specifications, please go to www.extron.com
Specifications are subject to change without notice.
UNIQUE FULL-RANGE CEILING TILE SPEAKER
The SF 228T features an exclusive ceiling tile speaker design for full-range sonic reproduction. The enclosure is specially engineered with a
large volume chamber for extended bass response. The front baffle design minimizes enclosure vibrations and optimizes sound quality. A
lightweight housing allows the SF 228T to meet ceiling-mounting codes without additional permits. The SF 228T delivers full-range sonic
performance comparable to a freestanding speaker, with a form factor and essential features ideal for installation in suspended ceilings.
Front Baffle
Plenum Rated
Enclosure meets UL 2043 requirements
for use in plenum airspaces
Provides rigidity and stiffness to
minimize vibrations
Two-Way Design
1" silk dome tweeter and
8" long-throw woofer
Ceiling Tile Enclosure
Standard 2' x 2' size for
direct placement into US-style
suspended ceilings
Lightweight Enclosure
The baffle and lightweight
housing together weigh less
than 20 pounds or 9 kg.
Full-Range Sonic
Performance
Tuned Bass Reflex Port
Works together with the woofer
and the large internal chamber for
deep, authoritative bass output
The SF 228T delivers a frequency
range of 50 Hz to 20 kHz.
White Perforated Grille
Matches appearance of air
conditioning vents
EASY TO INSTALL
The SF 228T is designed for quick and easy installation into standard US-style suspended tile ceilings. All that is necessary is to remove an
existing ceiling tile, make the speaker wiring connections, and then place the SF 228T onto the T-bar support grid. Multiple seismic tabs
simplify speaker anchoring. The process requires minimal effort and time without any pre-installation procedures necessary for the typical
round speaker, such as cutting holes through ceiling tiles and mounting supporting hardware.
If installing into a 2' x 4' ceiling, simply cut the existing ceiling tile to fill out the space adjacent to the speaker and the included T-bar. The end
result is a clean and inconspicuous speaker system that requires just minutes to install.
Installation in three easy steps: (1) Remove ceiling tile, (2) Make wiring connections,
(3) Place speaker on grid and anchor with seismic tabs. For 2' x 4' ceilings, trim ceiling
tile, to fit with provided T-bar.
The inconspicuous white grille allows the SF 228T to blend into the ceiling.
POLAR GRAPHS – 1/3 OCTAVE, HORIZONTAL
100.00 Hz
125.00 Hz
160.00 Hz
250.00 Hz
200.00 Hz
315.00 Hz
0 Deg
30
0
30
-30
0
60
-30
-90
100 Hz - 200 Hz
630.00 Hz
800.00 Hz
90
1.00 kHz
1.60 kHz
1.25 kHz
2.00 kHz
30
-30
0
60
-90
90
4.00 kHz
6.30 kHz
10.00 kHz
5.00 kHz
8.00 kHz
12.50 kHz
30
-30
4 kHz - 8 kHz
20.00 kHz
0
-30
-10
-60
60
-30
90
16.00 kHz
0 Deg
-10
-20
-90
1.6 kHz - 3.15 kHz
0 Deg
60
-60
-30
630 Hz - 1.25 kHz
0
-30
-20
-30
30
3.15 kHz
-10
-60
-20
90
2.50 kHz
0 Deg
-10
60
-90
250 Hz - 500 Hz
0 Deg
0
-60
-20
-30
30
-30
-10
-60
-20
90
500.00 Hz
0 Deg
-10
60
400.00 Hz
-20
-60
-30
-90
90
10 kHz - 20 kHz
-90
RESPONSE GRAPHS - FREQUENCY AND IMPEDANCE
SPL VS. FREQUENCY – 1 WATT @ 1 METER RESPONSE, HALF SPACE (2π)
100
dBSPL
90
80
70
60
50
40
20 Hz
50
100
200
500
1K
2K
5K
10K
20K
SPL VS. FREQUENCY – HORIZONTAL OFF-AXIS RESPONSE, HALF SPACE (2π)
100
dBSPL
90
80
70
60
0 Degrees
10 Degrees
20 Degrees
30 Degrees
40 Degrees
50
40
20 Hz
50
100
200
500
1K
2K
5K
10K
20K
200
500
1K
2K
5K
10K
20K
IMPEDANCE VS. FREQUENCY
50
Ohms
40
20
10
5
20 Hz
50
100
PANEL DRAWINGS
Top
Bottom
23.75"
60.325 cm
23.75"
60.325 cm
5.30"
13.46 cm
Side
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© 2013 Extron Electronics. All rights reserved. All trademarks mentioned are the property of their respective owners. Prices and specifications subject to change without notice.
12-2013
68-2533-01
REV. A
Letter - English - NP