Extron electronic Speaker SF 228T User Manual

User Guide  
Audio Products  
SF 228T  
2x 2Ceiling 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  
related topics, click here.  
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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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SF 228T  
Plenum 2' x 2'  
Ceiling Speaker  
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SF 228T  
Plenum 2' x 2'  
Ceiling Speaker  
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  
4
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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  
Connection to an Amplifier” on page 8 for the appropriate wiring procedure for either  
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  
6
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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  
8
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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  
10  
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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  
12  
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Dimensions  
23.75"  
23.75"  
5.30"  
SF 228T  
SF 228T Speaker System • Reference  
13  
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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  
14  
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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  
© 2011 Extron Electronics All rights reserved. www.extron.com  
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