User Guide
Audio Products
SF 228T
2’ x 2’ Ceiling Speakers
68-2018-01 Rev. A
05 11
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FCC Class A Notice
F
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15
of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired operation.
The Class A limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause harmful interference to radio commu-
nications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the
user will be required to correct the interference at his own expense.
NOTE: This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used with
the unit to ensure compliance with FCC emissions limits.
For more information on safety guidelines, regulatory compliances, EMI/EMF compliance, accessibility, and
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Conventions Used in this Guide
In this user guide, the following are used:
NOTE: A note draws attention to important information.
TIP: A tip provides a suggestion to make working with the application easier.
CAUTION: A caution indicates a potential hazard to equipment or data.
WARNING: A warning warns of things or actions that might cause injury, death, or
other severe consequences.
Copyright
© 2011 Extron Electronics. All rights reserved.
Trademarks
All trademarks mentioned in this guide are the properties of their respective owners.
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Contents
Precautions/Safety Instructions.............................ii
FCC Information.................................................iii
Copyright, and Trademark Information ...............iv
Introduction............................................................ 1
About this User Guide......................................... 1
Features.............................................................. 1
Application Example ........................................... 2
Installation.............................................................. 3
Installation Considerations.................................. 3
Installing the Speakers ........................................ 3
Speaker Cabling.................................................. 5
70/100 V Audio Distribution System................ 5
Direct 8 ohm Connection to an Amplifier........ 8
Completing the Installation................................. 9
Specifications, Dimensions and Packaging... 11
Specifications.................................................... 11
Part Numbers.................................................... 12
Included Parts ............................................... 12
Optional Parts and Accessories...................... 12
Dimensions....................................................... 13
Packaging......................................................... 14
SF 228T Speaker System • Contents
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SF 228T Speaker System • Contents
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Introduction
About this User Guide
This user guide contains information about the Extron SF 228T 2-way ceiling speakers.
The SF 228T features a low profile design that houses an 8-inch woofer and 1-inch dome
tweeter and has the appearance of a standard ventilation grill. All drivers and components
above the ceiling are hidden behind the grill.
The SF 228T is designed for use in plenum rated ceiling spaces and can be mounted into a
standard 2 feet x 2 feet or 2 feet x 4 feet (with supplied cross bars) false ceiling tile space on
a T-bar grid, or, a frame installed in solid ceilings.
Features
•
•
•
•
•
•
Drop-in 2-way speakers for suspended ceilings.
UL-2043 plenum rated enclosure.
An 8-inch, (20.3 cm), full range woofer provides extended low frequency response.
A 1-inch, (2.5 cm), dome tweeter provides extended high frequency response.
The white perforated grille matches the appearance of air conditioning vents.
8 ohm direct or 70/100Volt operation with 32, 16, 8, 4, and 2 watt selectable power
taps accessed with speaker wiring connections inside the rear panel.
•
•
•
•
•
Frequency response of 50 Hz to 20 kHz.
60 watts continuous pink noise, 120 watts continuous program rated.
90° conical coverage.
Low profile enclosure for plenum environments.
5 year parts and labor warranty.
SF 228T Speaker System • Introduction
1
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Application Example
The following illustration is an application example.
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Figure 1. SF 228T Application Example
SF 228T Speaker System • Introduction
2
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Installation
This section discusses how to install the SF 228T speaker and includes:
•
•
•
•
CAUTION: Installation and service must be performed by authorized personnel only.
Installation Considerations
•
Installation of conduit and conduit adapters must conform to all applicable building
codes and local ordinances.
•
Installation in a plenum-rated environment requires a wire gauge of 12 AWG to
18 AWG. Conduit may be required.
NOTE: When daisy chaining speakers in 70V or 100V configuration, the
maximum wire gauge is 16 AWG.
When daisy chaining speakers in direct (8 ohm) configuration, the
maximum wire gauge is 14 AWG.
•
•
If using seismic supports, the installer provides the safety cable.
NOTE: Observe all applicable building codes and local ordinances when installing
the speaker.
Wiring connections depend on the audio system the speakers are being installed with.
Installing the Speakers
1. Power down — Power down all attached devices before proceeding.
2. Remove the suspended ceiling tile — Remove the ceiling tile where the SF 228T will
be installed and lay it aside.
SF 228T Speaker System • Installation
3
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3. Remove the terminal cover plate — Loosen (do not remove) the two screws in the
keyhole slots on the top terminal cover plate and remove the cover plate as shown
below.
Loosen, but do not remove
the terminal cover plate
screws in the two keyhole slots.
Terminal Cover Plate
Figure 2. Remove Terminal Cover Plate
4. Routing cables through the terminal cover plate — The plate is mounted to the
speaker with the transformer side down.
a. When using flexible conduit — Insert the conduit into the cover plate opening
using an appropriate conduit adapter, and secure the conduit to the plate. See
below.
Flexible Conduit Adapter
Flexible Conduit
Terminal Cover Plate
Seismic Cable Pass
Through Loop
Rear of Speaker
Speaker
Terminal
Figure 3. Flexible Conduit Adapter
NOTE: Installation of conduit and conduit adapters should conform to all
applicable building codes and local ordinances.
SF 228T Speaker System • Installation
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b. When using speaker wires without conduit — Secure the cable clamp adapter
(included) to the cover plate and insert the wires through the clamp, (see the
illustration below).
Cable Clamp
Adapter (Included)
Terminal Cover Plate
Seismic Cable Pass
Through Loop
Rear of Speaker
Speaker
Terminal
Figure 4. Using a Cable Clamp Adapter
a distributed audio system (70V or 100V line distribution through the transformer) or for a
direct (8 ohm) connection from an amplifier (bypassing the transformer).
Speaker Cabling
70/100 V Audio Distribution System
NOTE: In the 70V or 100V distribution system diagram below, an optional
speaker has been added as an example of daisy chaining SF 228T speakers
to a single amplifier output.
To Next Speaker (terminal tap)
,
.
To Next Speaker (terminal tap)
NC
W
W
2
2
W
W
4
4
W
W
8
8
W
,
W
16
16
W
W
32
32
COM
7 0
V
NC
V
COM
1 0 0
.
NC
W
W
2
2
W
W
4
4
W
W
8
8
W
W
16
16
W
W
32
32
COM
7 0
V
NC
V
COM
1 0 0
From Amplifier ,
From Amplifier .
Figure 5. 70/100 V Terminal Connection
SF 228T Speaker System • Installation
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1. Flip the terminal cover plate so the transformer side is up.
(Black) To Speaker . Terminal
(Red) To Speaker , Terminal
NC
W
W
2
2
Cable Access Opening
W
W
4
4
Transformer
W
W
8
8
W
W
16
16
W
W
32
32
NC
COM
7 0
V
V
Transformer
Terminal Block
COM
1 0 0
Black (-)
Red (+)
Tap Label
To Second
Speaker
Black (-)
Red (+)
From Amplifier
(70V/100V)
Figure 6. Terminal Cover With Transformer Side Exposed
a. Route the two wires from the amplifier through the cable access opening to the
transformer terminal block. If conduit is used, pull the wires coming from the
amplifier through and out of the conduit.
b. Strip 3/16 inch (5 mm) from the wire ends and keep the wire end strands together
by twisting them. Do not tin the wires.
c. Secure the wires to the appropriate taps on the captive screw connectors of the
seven-connector transformer terminal block as indicated on the tap label.
When wiring to a single speaker, the black negative (–) wire attaches to the “COM”
terminal, and the red positive (+) wire attaches to the desired terminal tap.
NOTE: Pay close attention to the polarity of the wires. Do not mix negative
and positive wires.
Red Wire
From Amplifier (+)
NC
W
W
2
2
W
W
4
4
W
W
8
8
W
W
16
16
W
W
32
32
COM
7 0
V
NC
V
COM
1 0 0
Black Wire
From Amplifier (−)
Figure 7. Secure Wiring to Terminal Block
d. Use a small flat blade screwdriver to tighten the terminal block screws.
SF 228T Speaker System • Installation
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e. To wire additional speakers, route the speaker wires from the second speaker
through the cover plate hole to the transformer side. Twist the black negative (–)
wires together and the red positive (+) wires together before inserting them into the
terminal block. Additional speakers can be daisy-chained this way. See below.
NOTE: Pay close attention to the polarity of the wires. Do not mix negative
and positive wires.
NC
W
W
2
2
W
W
4
4
Red Wires
W
W
8
8
W
W
16
16
W
W
32
32
COM
7 0
V
NC
V
COM
1 0 0
Black Wires
From Amplifier (+)
To Next Speaker (terminal tap)
From Amplifier (–)
To Next Speaker (COM terminal)
Figure 8. Wiring Additional Speakers
2. Connect wires from the transformer to the speaker.
a. Keep the wire strands together by twisting them (do not tin the wires).
b. Connect the red positive (+) wire to the + speaker terminal and connect the black
negative (–) wire to the – speaker terminal as shown below.
Terminal Cover Plate
From Transformer
Black Wire
Red Wire
Rear of Speaker
Speaker Terminal
Figure 9. Connect the Speaker Wires
3. Replace the terminal cover plate and tighten the two cover plate screws that were
4. Test the system by powering on the amplifier and listening for the correct response from
the speakers. Disconnect the power from the amplifier.
SF 228T Speaker System • Installation
7
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Direct 8 Ohm Connection to an Amplifier
1. An amplifer 8 ohm speaker output can be directly connected to the speaker terminal of
the SF 228T, (see the diagram below).
Red Wire
Black Wire
From
Amplifier
Terminal Cover Plate
From Amplifier
Black Wire
Red Wire
Rear of Speaker
Direct 8 ohm Connection
Speaker Terminal
(Bypassing the Transformer)
Figure 10. Direct Amplifier Connection to Speaker
2. Route the wires from the amplifier speaker output to the speaker using the same
procedure for routing speaker wire (and conduit if applicable) through the terminal
3. Strip 3/16 inch (5 mm) from the ends of the two speaker wire leads coming from the
amplifier. Keep the wire strands together by twisting them (do not tin the wires).
4. Secure the wires to the input terminals of the speaker, observing the correct polarity.
Connect the red positive (+) wires to the + speaker terminal and the black negative (–)
wires to the – speaker terminal.
Red Wire ,
From Amplifier
To Second Speaker
Red Wire ,
From Amplifier
Black Wire .
From Amplifier
To Second Speaker
Black Wire .
One Speaker
Two Speakers
Figure 11. Speaker Terminal Wiring
5. Replace the terminal cover plate and tighten the two cover plate screws that were
6. Test the system by powering on the amplifier and listening for the correct response from
the speakers. Disconnect the power from the amplifier.
SF 228T Speaker System • Installation
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Completing the Installation
NOTE: Observe all applicable building codes and local ordinances when installing the
speaker.
1. For installation in a 2 feet x 2 feet ceiling tile, remove a tile and place the speaker on the
existing support rails as shown below.
Extron
SF 228T
Two-way Ceiling
Speakers
2' x 2'
Ceiling Tile
Ceiling Tile
Rails
Figure 12. 2 Feet x 2 Feet Ceiling Tile Installation
For installation in a 2 feet x 4 feet ceiling tile, remove a tile and cut the tile in half. Install
the supplied T-rail crosspiece, then replace the half-tile as shown below.
Extron
SF 228T
Two-way Ceiling
Speakers
2' x 4'
Ceiling Tile
Existing
Ceiling Tile
Rails
T-rail
Crosspiece
(supplied)
Figure 13. 2 Feet x 4 Feet Ceiling Tile Installation
Set the speaker in place in the ceiling and position it so the speaker edges are hidden by
the existing rails or T-rails.
SF 228T Speaker System • Installation
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2. If seismic safety lines are being used, install them now. In addition to the tie off at 4c,
Extron recommends tie offs on at least two at the four available tabs at 4e. See the
illustration below.
Anchor the safety cables
to a suitable secure point.
4f
4c
Attach a safety cable
to a line retainer loop
at either 4c or 4d.
4d
Seismic
Safety
Cable
Attach the seismic safety
cable to either tab.
Bend tab up.
4e
CAUTION: Repeated bending may cause the tab to break off.
Figure 14. Install the Seismic Safety Lines
a. Shut off power to all connected equipment.
b. Temporarily remove a ceiling tile adjacent to the speaker and set it aside.
c. Attach seismic safety cable to one or both line retainer loops at 4c.
d. If a seismic support cable has not been connected at 4c, attach one at 4d.
NOTE: A seismic support cable attached at 4c is recommended. 4d should be
considered only if attaching to 4c is not possible.
e. Attach seismic safety cable to at least two of the four seismic bendout tabs located
on either side of the speaker.
f. Attach the other end of the cables to a sturdy part of the building (studs, roof struts,
support girders or similar structure).
g. For additional support lines repeat as needed.
h. Replace the ceiling tile removed in step 4b.
3. Power on the amplifier, test and make any source device and system adjustments
following the amplifier operating instructions.
SF 228T Speaker System • Installation
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Specifications,
Dimensions and
Packaging
This section discusses the specifications, part number, and packaging for the
SF 228T speakers. Topics that are covered, include:
•
•
•
•
Specifications
Part Numbers
Dimensions
Packaging
Specifications
Audio/acoustic and electrical
Speaker type .................................. 2-way, full-range, in-ceiling speaker
Frequency range............................. 50 Hz to 20 kHz, -10 dB, half space
Power capacity............................... 60 W (rms) continuous pink noise (per IEC 60268-5)
120 W (rms) continuous program
Nominal sensitivity.......................... 89 dB SPL, 1 watt, 1 m, half space
Nominal coverage angle................. 90° conical coverage
Nominal impedance ....................... 8 ohms per speaker
Crossover frequency....................... 4.5 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
70V input................................ 32 W, 16 W, 8 W, 4 W, 2 W, null (bypass 8 ohm direct connection)
100V input.............................. Null, 32 W, 16 W, 8 W, 4 W, 2 W (bypass 8 ohm direct connection)
General
Package ......................................... 2 speakers (1 pair) with 2 feet (61 cm) cross bars
Temperature/humidity .................... Storage: -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
Mounting....................................... Drops into 2 feet x 2 feet (61 cm x 61 cm) or 2 feet x 4 feet (61 cm x 122 cm)
suspended tile ceilings
Enclosure type................................ Composite, square, with metal grille
Enclosure outer dimensions............ 5.3" H x 23.75" W x 23.75" L
(13.5 cm H x 60.3 cm W x 60.3 cm L)
Product weight............................... Single: 18.5 lbs (8.4 kg)
Shipping weight............................. Pair: 45 lbs (21 kg) with mounting kit
SF 228T Speaker System • Reference
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Vibration........................................ ISTA 1A in carton (International Safe Transit Association)
Regulatory compliance
Safety...................................... 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
Warranty........................................ 5 years parts and labor
NOTE: All nominal levels are at 10%.
NOTE: Specifications are subject to change without notice.
Part Numbers
Included Parts
Part Description
Part Number
(2) SF 228T Speakers
(2) Cross bars, (2 feet in length)
(2) Cable clamp connectors
SF 228T Setup Guide
10-333-02LF
Optional Parts and Accessories
Part description
Part number
Terminal cover kit with transformer
881285-RK
SF 228T Speaker System • Reference
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Dimensions
23.75"
23.75"
5.30"
SF 228T
SF 228T Speaker System • Reference
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Packaging
SF 228T Setup
Guide
Top Cap
Rail Tube
End Cap
Ceiling Tile
Rails
Speakers
Protective Sheet
Bottom Cap
SF 228T Speaker System • Reference
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Extron® Warranty
Extron Electronics warrants this product against defects in materials and workmanship for a period of three years
from the date of purchase. In the event of malfunction during the warranty period attributable directly to faulty
workmanship and/or materials, Extron Electronics will, at its option, repair or replace said products or components,
to whatever extent it shall deem necessary to restore said product to proper operating condition, provided that it is
returned within the warranty period, with proof of purchase and description of malfunction to:
USA, Canada, South America,
Japan:
and Central America:
Extron Electronics
1001 East Ball Road
Anaheim, CA 92805
U.S.A.
Extron Electronics, Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan
Europe, Africa, and the Middle
East:
Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands
China:
Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China
Asia:
Extron Asia
Middle East:
Extron Middle East
135 Joo Seng Road, #04-01
PM Industrial Bldg.
Singapore 368363
Singapore
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai
This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care, electrical
or mechanical abuse, abnormal operating conditions, or modifications were made to the product that were not
authorized by Extron.
NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA (Return
Authorization) number. This will begin the repair process.
USA: (714) 491-1500
Asia: 65.6383.4400
Europe: 31.33.453.4040
Japan: 81.3.3511.7655
Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of loss or damage
during shipment. Returned units must include the serial number and a description of the problem, as well as the
name of the person to contact in case there are any questions.
Extron Electronics makes no further warranties either expressed or implied with respect to the product and its quality,
performance, merchantability, or fitness for any particular use. In no event will Extron Electronics be liable for direct,
indirect, or consequential damages resulting from any defect in this product even if Extron Electronics has been
advised of such damage.
Please note that laws vary from state to state and country to country, and that some provisions of this warranty may
not apply to you.
Extron USA - West
Extron USA - East
Extron Europe
Extron Asia
Extron Japan
Extron China
Extron Middle East
Headquarters
+81.3.3511.7655
+81.3.3511.7656 FAX
+971.4.2991800
+971.4.2991880 FAX
+800.7339.8766
Inside Asia Only
+400.883.1568
Inside China Only
+800.633.9876
Inside USA/Canada Only
+800.633.9876
Inside USA/Canada Only
+800.3987.6673
Inside Europe Only
+65.6383.4400
+65.6383.4664 FAX
+86.21.3760.1568
+86.21.3760.1566 FAX
+1.714.491.1500
+1.714.491.1517 FAX
+1.919.863.1794
+1.919.863.1797 FAX
+31.33.453.4040
+31.33.453.4050 FAX
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