Extron electronic SF 228T User Manual

SF 228T

2’ x 2’ Ceiling Speakers

User Guide

Audio Products

68-2018-01 Rev. A

05 11

Safety Instructions • English

This symbol is intended to alert the user of important operating and mainte­nance (servicing) instructions in the literature provided with the equipment.

This symbol is intended to alert the user of the presence of uninsulated
dangerous voltage within the product feets enclosure that may present a risk
of electric shock.

Caution

Read Instructions • Read and understand all safety and operating instructions before using the equipment.
Retain Instructions • The safety instructions should be kept for future reference.
Follow Warnings • Follow all warnings and instructions marked on the equipment or in the user information.
Avoid Attachments • Do not use tools or attachments that are not recommended by the equipment

manufacturer because they may be hazardous.

Warning

Power sources • This equipment should be operated only from the power source indicated on the product. This

equipment is intended to be used with a main power system with a grounded (neutral) conductor. The third
(grounding) pin is a safety feature, do not attempt to bypass or disable it.

Power disconnection • To remove power from the equipment safely, remove all power cords from the rear of

the equipment, or the desktop power module (if detachable), or from the power source receptacle (wall plug).

Power cord protection • Power cords should be routed so that they are not likely to be stepped on or pinched

by items placed upon or against them.

Servicing • Refer all servicing to qualified service personnel. There are no user-serviceable parts inside. To prevent

the risk of shock, do not attempt to service this equipment yourself because opening or removing covers may
expose you to dangerous voltage or other hazards.

Slots and openings • If the equipment has slots or holes in the enclosure, these are provided to prevent

overheating of sensitive components inside. These openings must never be blocked by other objects.

Lithium battery • There is a danger of explosion if battery is incorrectly replaced. Replace it only with the

same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the
manufacturer feets instructions.

Consignes de Sécurité • Français

Ce symbole sert à avertir l feetutilisateur que la documentation fournie avec
le matériel contient des instructions importantes concernant l feetexploita­tion et la maintenance (réparation).

Ce symbole sert à avertir l feetutilisateur de la présence dans le boîtier de
l feetappareil de tensions dangereuses non isolées posant des risques d
feetélectrocution.

Attention

Lire les instructions• Prendre connaissance de toutes les consignes de sécurité et d feetexploitation avant d

feetutiliser le matériel.

Conserver les instructions• Ranger les consignes de sécurité afin de pouvoir les consulter à l feetavenir.
Respecter les avertissements • Observer tous les avertissements et consignes marqués sur le matériel ou

présentés dans la documentation utilisateur.

Eviter les pièces de fixation • Ne pas utiliser de pièces de fixation ni d feetoutils non recommandés par le

fabricant du matériel car cela risquerait de poser certains dangers.

Sicherheitsanleitungen • Deutsch

Dieses Symbol soll dem Benutzer in der im Lieferumfang enthaltenen
Dokumentation besonders wichtige Hinweise zur Bedienung und Wartung
(Instandhaltung) geben.

Dieses Symbol soll den Benutzer darauf aufmerksam machen, daß im Inneren
des Gehäuses dieses Produktes gefährliche Spannungen, die nicht isoliert sind
und die einen elektrischen Schock verursachen können, herrschen.

Achtung

Lesen der Anleitungen • Bevor Sie das Gerät zum ersten Mal verwenden, sollten Sie alle Sicherheits-und

Bedienungsanleitungen genau durchlesen und verstehen.

Aufbewahren der Anleitungen • Die Hinweise zur elektrischen Sicherheit des Produktes sollten Sie

aufbewahren, damit Sie im Bedarfsfall darauf zurückgreifen können.

Befolgen der Warnhinweise • Befolgen Sie alle Warnhinweise und Anleitungen auf dem Gerät oder in der

Benutzerdokumentation.

Keine Zusatzgeräte • Verwenden Sie keine Werkzeuge oder Zusatzgeräte, die nicht ausdrücklich vom

Hersteller empfohlen wurden, da diese eine Gefahrenquelle darstellen können.

Avertissement

Alimentations • Ne faire fonctionner ce matériel qu feetavec la source d feetalimentation indiquée sur l

feetappareil. Ce matériel doit être utilisé avec une alimentation principale comportant un fil de terre (neutre).
Le troisième contact (de mise à la terre) constitue un dispositif de sécurité : n feetessayez pas de la contourner
ni de la désactiver.

Déconnexion de l feetalimentation• Pour mettre le matériel hors tension sans danger, déconnectez tous les

cordons d feetalimentation de l feetarrière de l feetappareil ou du module d feetalimentation de bureau (s feetil
est amovible) ou encore de la prise secteur.

Protection du cordon d feetalimentation • Acheminer les cordons d feetalimentation de manière à ce que

personne ne risque de marcher dessus et à ce qu feetils ne soient pas écrasés ou pincés par des objets.

Réparation-maintenance • Faire exécuter toutes les interventions de réparation-maintenance par un technicien

qualifié. Aucun des éléments internes ne peut être réparé par l feetutilisateur. Afin d feetéviter tout danger d
feetélectrocution, l feetutilisateur ne doit pas essayer de procéder lui-même à ces opérations car l feetouverture
ou le retrait des couvercles risquent de l feetexposer à de hautes tensions et autres dangers.

Fentes et orifices • Si le boîtier de l feetappareil comporte des fentes ou des orifices, ceux-ci servent à empêcher

les composants internes sensibles de surchauffer. Ces ouvertures ne doivent jamais être bloquées par des objets.

Lithium Batterie • Il a danger d feetexplosion s feetll y a remplacment incorrect de la batterie. Remplacer

uniquement avec une batterie du meme type ou d feetun ype equivalent recommande par le constructeur.
Mettre au reut les batteries usagees conformement aux instructions du fabricant.

Vorsicht

Stromquellen • Dieses Gerät sollte nur über die auf dem Produkt angegebene Stromquelle betrieben werden.

Dieses Gerät wurde für eine Verwendung mit einer Hauptstromleitung mit einem geerdeten (neutralen) Leiter
konzipiert. Der dritte Kontakt ist für einen Erdanschluß, und stellt eine Sicherheitsfunktion dar. Diese sollte nicht
umgangen oder außer Betrieb gesetzt werden.

Stromunterbrechung • Um das Gerät auf sichere Weise vom Netz zu trennen, sollten Sie alle Netzkabel aus der

Rückseite des Gerätes, aus der externen Stomversorgung (falls dies möglich ist) oder aus der Wandsteckdose

ziehen.

Schutz des Netzkabels • Netzkabel sollten stets so verlegt werden, daß sie nicht im Weg liegen und niemand

darauf treten kann oder Objekte darauf- oder unmittelbar dagegengestellt werden können.

Wartung • Alle Wartungsmaßnahmen sollten nur von qualiziertem Servicepersonal durchgeführt werden.

Die internen Komponenten des Gerätes sind wartungsfrei. Zur Vermeidung eines elektrischen Schocks
versuchen Sie in keinem Fall, dieses Gerät selbst öffnen, da beim Entfernen der Abdeckungen die Gefahr eines
elektrischen Schlags und/oder andere Gefahren bestehen.

Schlitze und Öffnungen • Wenn das Gerät Schlitze oder Löcher im Gehäuse aufweist, dienen diese zur

Vermeidung einer Überhitzung der empndlichen Teile im Inneren. Diese Öffnungen dürfen niemals von

anderen Objekten blockiert werden.

Litium-Batterie • Explosionsgefahr, falls die Batterie nicht richtig ersetzt wird. Ersetzen Sie verbrauchte Batterien

nur durch den gleichen oder einen vergleichbaren Batterietyp, der auch vom Hersteller empfohlen wird.
Entsorgen Sie verbrauchte Batterien bitte gemäß den Herstelleranweisungen.

Instrucciones de seguridad • Español

Este símbolo se utiliza para advertir al usuario sobre instrucciones impor­tantes de operación y mantenimiento (o cambio de partes) que se desean
destacar en el contenido de la documentación suministrada con los equipos.

Este símbolo se utiliza para advertir al usuario sobre la presencia de elemen­tos con voltaje peligroso sin protección aislante, que puedan encontrarse
dentro de la caja o alojamiento del producto, y que puedan representar
riesgo de electrocución.

Precaucion

Leer las instrucciones • Leer y analizar todas las instrucciones de operación y seguridad, antes de usar el

equipo.

Conservar las instrucciones • Conservar las instrucciones de seguridad para futura consulta.
Obedecer las advertencias • Todas las advertencias e instrucciones marcadas en el equipo o en la

documentación del usuario, deben ser obedecidas.

Evitar el uso de accesorios • No usar herramientas o accesorios que no sean especificamente

recomendados por el fabricante, ya que podrian implicar riesgos.

安全须知 • 中文

这个符号提示用户该设备用户手册中有重要的操作和维护说明。

这个符号警告用户该设备机壳内有暴露的危险电压，有触电危险。

注意

阅读说明书 • 用户使 用该设备前必须阅读并理 解所有安全和 使用说明。
保存说明书 • 用户应保存安全说明 书以备将来使用。
遵守警告 • 用户应遵守产品和用户指南上的所有安 全和操作说明。
避免追加 • 不要使 用该产品厂商没有推荐的工具或追加设备，以避免危险。

Advertencia

Alimentación eléctrica • Este equipo debe conectarse únicamente a la fuente/tipo de alimentación eléctrica

indicada en el mismo. La alimentación eléctrica de este equipo debe provenir de un sistema de distribución
general con conductor neutro a tierra. La tercera pata (puesta a tierra) es una medida de seguridad, no
puentearia ni eliminaria.

Desconexión de alimentación eléctrica • Para desconectar con seguridad la acometida de alimentación

eléctrica al equipo, desenchufar todos los cables de alimentación en el panel trasero del equipo, o desenchufar
el módulo de alimentación (si fuera independiente), o desenchufar el cable del receptáculo de la pared.

Protección del cables de alimentación • Los cables de alimentación eléctrica se deben instalar en lugares

donde no sean pisados ni apretados por objetos que se puedan apoyar sobre ellos.

Reparaciones/mantenimiento • Solicitar siempre los servicios técnicos de personal calicado. En el interior no

hay partes a las que el usuario deba acceder. Para evitar riesgo de electrocución, no intentar personalmente la
reparación/mantenimiento de este equipo, ya que al abrir o extraer las tapas puede quedar expuesto a voltajes
peligrosos u otros riesgos.

Ranuras y aberturas • Si el equipo posee ranuras o orificios en su caja/alojamiento, es para evitar el

sobrecalientamiento de componentes internos sensibles. Estas aberturas nunca se deben obstruir con otros

objetos.

Batería de litio • Existe riesgo de explosión si esta batería se coloca en la posición incorrecta. Cambiar esta

batería únicamente con el mismo tipo (o su equivalente) recomendado por el fabricante. Desachar las baterías

usadas siguiendo las instrucciones del fabricante.

警告

电源 • 该设备只能使用产品上标明的电源。 设备必须使用有地线的供电系统供电。 第三条线（

地线）是安全设施，不能不用或跳过 。

拔掉电源 • 为安全 地从设备拔掉电源，请拔掉所有设备后或桌面电源的电源线，或任何接到市电

系统的电源 线。

电源线保护 • 妥善布线， 避免被踩踏，或重物挤压。
维护 • 所有维修必须由认证的维修人员进行。 设备内部没有用户可以更换的零件。为避免出现触

电危险不 要自己试图打开设备盖子维修 该设备。

通风孔 • 有些设备机壳上有通风槽或孔，它们是用来防止机内敏感元件过热。 不要用任何 东西

挡住通风孔。

锂电池 • 不正确的更换电池会有爆炸的危险。必须使用与厂家推荐的相同或相近型号的电池。按

照生产厂的建议处 理废弃电 池。

FCC Class A Notice

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 commu­nications. 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.

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.

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 v

SF228TSpeakerSystem•Contents vi

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 70/100 Volt 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

Application Example

Extron

The following illustration is an application example.

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MIC/LINE INPUTS

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Extron
SF 228T

Flat Panel Display

Plenum 2' x 2'
Ceiling Speaker

Extron

Extron

Extron

Extron

Extron

Extron

XPA 1002

2
OUTPUT
1

CLASS 2 WIRING

REMOTE

50 mA

10V

VOL/MUTE

INPUTS

2

STANDBY

1

LEVEL

2

1

17TT

AUDIO/VIDEO

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PROTECT

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100-240V 1.5A, 50-60Hz

XPA 1002

Power
Amplier

Extron

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Extron

Extron

Extron
SF 228T

Plenum 2' x 2'
Ceiling Speaker

Figure 1. SF 228T Application Example

SF228TSpeakerSystem•Introduction 2

Installation

This section discusses how to install the SF 228T speaker and includes:

• Installation Considerations

• Installing the Speakers

• Speaker Cabling

• Completing the Installation

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 70 V or 100 V configuration, the

• If using seismic supports, the installer provides the safety cable.

NOTE: Observe all applicable building codes and local ordinances when installing

• 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.

maximum wire gauge is 16 AWG.
When daisy chaining speakers in direct (8 ohm) configuration, the

maximum wire gauge is 14 AWG.

the speaker.

SF228TSpeakerSystem•Installation 3

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.

Te rminal 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

Te rminal Cover Plate

Seismic Cable Pass
Through Loop

Rear of Speaker

Speaker
Te rminal

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

b. When using speaker wires without conduit — Secure the cable clamp adapter

To Next Speaker (terminal tap)

.

(included) to the cover plate and insert the wires through the clamp, (see the
illustration below).

Cable Clamp
Adapter (Included)

Te rminal Cover Plate

Seismic Cable Pass
Through Loop

Rear of Speaker

Speaker
Te rminal

Figure 4. Using a Cable Clamp Adapter

Proceed to “70/100 V Audio Distribution System” on page 5 or “Direct 8 Ohm

Connection to an Amplifier” on page 8 for the appropriate wiring procedure for either

a distributed audio system (70 V or 100 V 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 70 V or 100 V distribution system diagram below, an optional

speaker has been added as an example of daisy chaining SF 228T speakers
to a single amplifier output.

,
.

NC

2 W

W8 W32 WCOM

4

8 W 4 W 2 W

16 W

16 W

70 V

COM NC 32 W

100 V

To Next Speaker (terminal tap)

,

.

NC

2 W

W8 W32 WCOM

4

8 W 4 W 2 W

16 W

16 W

70 V

COM NC 32 W

100 V

From Amplifier ,

From Amplifier

Figure 5. 70/100 V Terminal Connection

SF228TSpeakerSystem•Installation 5

1. Flip the terminal cover plate so the transformer side is up.

(Black) To Speaker . Terminal

(Red) To Speaker , Te rminal

Transformer

Transformer
Te rminal Block

Tap Label

70 V

16 W

32 WCOM

COM NC 32 W

100 V

4 W8 W

16 W

2 W

8 W 4 W 2 W

Cable Access Opening

Black (-)

To Second
Speaker

Red (+)

Black (-)

Red (+)

NC

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.

16 W

70 V

COM NC 32 W

100 V

Black Wire

4 W8 W32 WCOM

16 W

NC

2 W

8 W 4 W 2 W

Red Wire

From Amplifier (−)

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

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

2 W

70 V

16 W

COM NC 32 W

100 V

4 W8 W32 WCOM

8 W 4 W 2 W

16 W

Black Wires

Red 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.

Te rminal 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

loosened in step 3 of “Installing the Speakers” on page 3.

4. Test the system by powering on the amplifier and listening for the correct response from

the speakers. Disconnect the power from the amplifier.

5. Proceed to “Completing the Installation” on page 8.

SF228TSpeakerSystem•Installation 7

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

From
Amplifier

From Amplifier

Black Wire

Red Wire

Speaker Terminal

Black Wire

Te rminal Cover Plate

Rear of Speaker

Direct 8 ohm Connection
(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
cover plate, see “Installing the Speakers” on page 3.

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

Black Wire .

One Speaker

Two Speakers

Red Wire ,

From Amplifier
To Second Speaker

From Amplifier
To Second Speaker

Black Wire .

Figure 11. Speaker Terminal Wiring

5. Replace the terminal cover plate and tighten the two cover plate screws that were

loosened in step 3 of “Installing the Speakers” on page 3.

6. Test the system by powering on the amplifier and listening for the correct response from

the speakers. Disconnect the power from the amplifier.

7. Proceed to “Completing the Installation” on page 8.

SF228TSpeakerSystem•Installation 8

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

Ceiling Tile
Rails

2' x 2'
Ceiling Tile

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 9

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

4f

to a suitable secure point.

Bend tab up.

Seismic
Safety
Cable

Attach the seismic safety

4e

cable to either tab.

4c

4d

Attach a safety cable
to a line retainer loop
at either 4c or 4d.

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

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

70 V input ................................ 32 W, 16 W, 8 W, 4 W, 2 W, null (bypass 8 ohm direct connection)

100 V 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 11

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

Optional Parts and Accessories

Part Description Part Number

(2) SF 228T Speakers

(2) Cross bars, (2 feet in length)

(2) Cable clamp connectors 10-333-02LF

SF 228T Setup Guide

Part description Part number

Terminal cover kit with transformer 881285-RK

SF228TSpeakerSystem•Reference 12

Dimensions

23.75"

23.75"

5.30"

SF 228T

SF228TSpeakerSystem•Reference 13

Packaging

SF 228T Setup
Guide

Rail Tube

Top Cap

End Cap

Ceiling Tile
Rails

Speakers

Protective Sheet

Bottom Cap

SF228TSpeakerSystem•Reference 14

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,
and Central America:

Extron Electronics
1001 East Ball Road
Anaheim, CA 92805
U.S.A.

Europe, Africa, and the Middle
East:

Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands

Asia:

Extron Asia
135 Joo Seng Road, #04-01
PM Industrial Bldg.
Singapore 368363

Japan:

Extron Electronics, Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan

China:

Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China

Middle East:

Extron Middle East
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai

Singapore

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: [phone] Europe: 31.33.453.4040
Asia: 65.6383.4400 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
Headquarters

+800.633.9876

Inside USA/Canada Only

+1.714.491.1500
+1.714.491.1517 FAX

Extron USA - East

+800.633.9876

Inside USA/Canada Only

+1.919.863.1794
+1.919.863.1797 FAX

Extron Europe

+800.3987.6673

Inside Europe Only

+31.33.453.4040
+31.33.453.4050 FAX

Extron Asia

+800.7339.8766

Inside Asia Only

+65.6383.4400
+65.6383.4664 FAX

Extron Japan

+81.3.3511.7655
+81.3.3511.7656 FAX

Extron China

+400.883.1568

Inside China Only

+86.21.3760.1568
+86.21.3760.1566 FAX

Extron Middle East

+971.4.2991800
+971.4.2991880 FAX

© 2011 Extron Electronics All rights reserved. www.extron.com