Extron electronics SF 228T Plus Manuale utente

SF 228T Plus • User Guide

The Extron SF228T Plus Sound Field® 2-way ceiling speaker features a low

prole design that houses an 8-inch woofer and 1.1-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 Plus uses plenum rated ceiling spaces and can be mounted into a standard 2 feet x 2 feet or 2 feet x 4 feet (with

supplied t-rail crosspieces) false ceiling tile space on a T-bar grid, or, a frame installed in solid ceilings.

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. The Class A limits 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 interference. This interference must be corrected at the expense of the user.

NOTE: For more information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related

topics, see the “Extron Safety and Regulatory Compliance Guide” on the Extron website.

Speciﬁcations

Product specications are available on the Extron website, www.extron.com.

Features

• Drop-in 2-way speakers for suspended ceilings.

• UL-2043 plenum rated enclosure.

• An 8-inch, (203 mm), full range woofer provides extended low frequency response.

• A 1.1-inch, (28 mm), 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 64, 32, 16, and 8 watt selectable power taps accessed with speaker wiring

connections inside the rear panel.

• Frequency range of 59 Hz to 22 kHz.

• 90 watts continuous pink noise, 180 watts continuous program rated.

• 90° conical coverage.

• Low profile enclosure for plenum environments.

• 5 year parts and labor warranty.

SF 228T Plus • User Guide (Continued)

Application Example

The following illustration shows one way to congure a system using the SF 228T Plus.

NetPA U 1002 SERIES

LIMITER/PROTECT

SIGNAL

OVER

TEMP 21

mute selectmute select

AUDIO

Extron

NetPA U 1002-70V

Power Amplier

Ethernet

Audio Line

Inputs Audio Line Outs

Wireless Mic 1

Wireless Mic 2

Ext

ron

228T Plus

enum 2' x 2'

Ceiling Spea

ker

Ext

ron

228T Plus

enum 2' x 2'

Ceiling Spea

ker

Assistive Listening

System Transmitter

Extron

WPD 101 3.5 mm

Single Gang

Pass-Through

Wallplate

Figure 1. SF228T Plus Application Diagram

Installation

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

• Installation Considerations

• Installing the Speakers

• Wiring the Speakers

• Completing the Installation

CAUTION:

• Installation and service must be performed by authorized personnel only.

• L’installation et l’entretien doivent être effectués uniquement par du personnel autorisé.

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.

• 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 Plus will be installed and lay it aside.

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 in figure 2.

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

Keyhole Slots

Terminal

Cover Plate Loosen but do not remove

the two screws in the keyhole

slots on either side of the

cover plate.

Figure 2. Remove Terminal Cover Plate

SF 228T Plus • User Guide (Continued)

4. Routing cables through the terminal cover plate:

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 figure 3).

NOTE: If running cable to an additional speaker through conduit, remove the secondary knock-out and insert the

conduit into the hole.

Speaker

Terminal

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100 V

70 V

Terminal Cover Plate

Flexible Conduit Adapter

Flexible Conduit

Secondary Knock-out

Figure 3. Flexible Conduit Adapter

NOTE: Installation of conduit and conduit adapters should conform to all applicable building codes and local

ordinances.

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 figure 4).

Speaker

Terminal

Cable Clamp

Adapter (Included)

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100 V

70 V

Terminal Cover Plate

Secondary Knock-out

Figure 4. Cable Clamp Adapter

c. TIghen the adapter screws to hold the wires firmly in place.

Wiring the Speakers

Inside the speaker compartment, red (+) and black (-) speaker wires are pre-attached to separate three-pole splicing connectors.

Figure 5. Speaker Wires with Splicing Connectors

1. Route the two red and black power amplifier or speaker wires through the cable access opening. if conduit is used, pull the

wire ends out from the conduit casing.

2. Using the guide on the side of the splicing connector, strip .43 inch (11 mm) from the ends of the protruding red and black

wires.

.43" (11 mm)

DO NO

T TIN the wires.

Figure 6. Wire-stripping Measurement

3. Lock the red and black power amplifier or speaker wires into their respective 3-pole splicing connectors.

a. Lift one lever of the red-wired 3-pole splicing connector 1and insert the stripped end of the red wire into an empty pole

of the connector 2. Press the lever down to lock the red wire in place 3(see figure 7).

Figure 7. Locking the Red Power Ampliﬁer Wire

b. Next, lift one lever of the other (black-wired) 3-pole splicing connector 1and insert the stripped end of the black wire

into an empty pole of the connector 2. Press the lever down to lock the black wire in place 3.

Figure 8. Locking the Black Power Ampliﬁer Wire

NOTE: Each pole of the splicing connector is capable of accepting up to 12 AWG wire.

SF 228T Plus • User Guide (Continued)

4. To wire a second speaker —

a. Measure the distance between the two speakers intended installlation points, add an extra foot or third of a meter for

safety, and cut that length in speaker wire cable.

TIP: Estimate the distance by counting the number of 2 x 2 inch or 2 x 4 inch ceiling tiles.

b. Remove the secondary knock-out from the terminal cover plate of the primary speaker, and route one end of the speaker

cable through the secondary cable access opening. If conduit is used, pull the wires through and out of the conduit.

From Ampliﬁer

or Previous

Speaker

Red Wire

Black Wire

Red Wire

To Next

Speaker

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100 V

70 V

Figure 9. Routing Second Speaker Wires through Primary Speaker Cover Plate

c. Following steps 2 and 3 on page 5, strip and lock the red and black wire ends into their respective connectors.

d. For wiring the second speaker, repeat steps 1 of Installing the Speakers (page 2) through step 3 of Wiring the

Speakers (page 3).

e. For wiring additional speakers, repeat step 4 as necessary.

5. Replace the terminal cover plate and tighten the two cover plate screws that were loosened in step 3of Installing the

Speakers on page 3.

6. Set the rotary tap selector switch to the appropriate power setting using a small screwdriver.

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

Adjust the Tap Selector

100 V

70 V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

Figure 10. Rotary Tap Selector Switch

ATTENTION:

• When setting the taps for a distributed (high impedance) system, do not tap the system above the rated power of

the amplifier.

• Lors de la mise en place des capteurs pour un système distribué (haute impédance), n’exploitez pas le système au

delà du niveau d’alimentation de l’amplificateur.

• When connecting multiple speakers in 8-ohm mode, be sure that the combined rated impedance does not equal a

value less than the minimum rated impedance of the amplifier.

• Lors de la connexion de plusieurs enceintes en mode 8 ohm, assurez vous que le niveau d’impédance combinée

ne soit pas équivalent à une valeur inférieure à l’impédance minimum de l’amplificateur.

7. Test the system by powering on the amplifier and listening for the correct response from the speakers. Disconnect the power

from the amplifier.

Completing the Installation

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

1. Ceiling tile installation —

a. 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

in figure 12.

Extr

SF 228T Plus

wo-way Ceiling

Speakers

Ceiling Tile

Rails

2' x 2'

Ceiling Tile

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

Figure 11. 2 Feet x 2 Feet Ceiling Tile Installation

b. 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 in figure 13.

Extron

SF 228T Plus

Two-way Ceiling

Speakers

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

Existing

Ceiling Tile

Rails

T-rail

Crosspiece

(supplied)

2' x 4'

Ceiling Tile

Figure 12. 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.

68-3387-01 Rev. A

11 20

For information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics, see the

Extron Safety and Regulatory Compliance Guide on the Extron website.

All trademarks mentioned are the property of their respective owners.

Worldwide Headquarters: Extron USA West, 1025 E. Ball Road, Anaheim, CA 92805, 800.633.9876

2. If seismic safety lines are being used, install them now. In addition to the tie off at BandC, Extron recommends a tie off on

one of the four available tabs at A. See the illustration below.

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

8Ω

8Ω

64W

32W

OFF

16W

64W

32W

16W

OFF

100V

70V

Attach the seismic safety cable

to any of the four (4) bend up tabs.

Anchor the safety cables

to a suitable secure point.

Seismic

Safety

Cable

Bend Up Tab

Attach a safety cable

to either B or C

line retainer.

NOTE: Speaker wiring has been omitted for clarity.

CAUTION:

• Repeated bending may cause the tab to break off.

• La flexion répétée peut provoquer la rupture de l’onglet.

Figure 13. 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 Band C.

d. Attach seismic safety cable to at least one of the four (4) seismic bendout tabs located on either side of the speaker, A.

e. Attach the other end of the cables (D) to a sturdy part of the building (studs, roof struts, support girders or similar

structure).

f. For additional support lines, repeat as needed.

g. Replace the ceiling tile removed in step b.

3. Power on the amplifier, test and make any source device and system adjustments following the amplifier operating

instructions.

Indice

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