Extron electronics SF 228T Manuale utente
1
This setup guide contains installation information about the Extron SF 228T
speaker. This speaker is designed for use in plenum rated ceiling spaces and
can be dropped 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.
CAUTION:Installation and service must be performed by
authorized personnel only.
Planning the Installation
zInstallation of conduit and conduit adapters must conform to all applicable building codes and local ordinances.
zInstallation 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 maximum wire gauge is 16 AWG.
When daisy chaining speakers in direct (8 ohm) configuration, the maximum wire gauge is 14 AWG.
zIf using seismic supports, the installer provides the cables.
zWiring connections depend on whether a distributed (70 or 100 volt) or direct speaker audio system configuration is
installed with these speakers.
Installation
To install the speaker system:
1. Power down all attached devices before proceeding.
2. Remove the 2 feet x 2 feet ceiling tile where the SF 228T
will be installed. If the ceiling has 2 feet x 4 feet tiles,
remove the tile and cut it in half.
3. Loosen, but do not remove, the two screws on the top
terminal cover plate as shown at right.
4. Slide and remove the terminal cover plate, which is
installed with the transformer side in. Temporarily flip the
terminal cover plate so the transformer side faces out.
See below.
NC
2 W
4 W8 W
16 W
32 WCOM
70 V
100 V
COM NC 32 W 16 W 8 W 4 W 2 W
(Red) To Speaker ,Te rminal
(Black) To Speaker .Te rminal
Cable Access Opening
Transformer
Te rminal Block
Ta p Label
5. When using flexible conduit, insert the conduit into the cover plate
cable access opening using an appropriate conduit adapter.
Secure the conduit to the plate. See right.
Loosen but do not remove
the two screws in the keyhole
slots on either side of the
cover plate.
Keyhole Slots
c
d
Te rminal
Cover Plate
Te rminal Cover Plate
Seismic Cable Pass
Through Loop
Flexible Conduit
Flexible Conduit Adapter
Rear of Speaker
Speaker
Te rminal
2
SF 228T • Setup Guide (Continued)
When using speaker wires without a conduit, secure the
cable clamp adapter (included) to the terminal cover plate and insert
the wires through the clamp. See right.
6. Proceed to step 7for wiring instructions for a distributed audio system
(70 V or 100 V line distribution through the transformer), or to step 9
for a direct connection from an amplifier (bypassing the transformer).
70 V or 100 V Audio Distribution System Connection (Through the Transformer)
NOTE: In the 70 V or 100 V distribution system block diagram below, an optional speaker has been
added as an example of daisy chaining SF 228T speakers to a single amplifier output.
7. Connect cables from the amplifier to the proper
connectors on the transformer terminal block on
the SF 228T terminal cover plate.
a. Pull the wires from the amplifier through the
conduit or cable clamp.
b. Route the two wires from the amplifier
through the cover plate hole to the transformer
terminal connectors.
c. Strip 3/16 inch (5 mm) from the wire ends. Keep
each of the wire ends together by twisting them.
Do not tin the wires.
NC
2 W
4 W
8 W
32 W
COM
70 V
100 V
COM NC 32 W 16 W 8 W 4 W 2 W
16 W
Red Wire
Black Wire
From Amplifier ,
From Amplifier .
NC
2 W
4 W8 W32 WCOM
70 V
100 V
COM NC 32 W 16 W 8 W 4 W 2 W
16 W
Red Wires
Black Wires From Amplifier ,
To Next Speaker (terminal tap)
From Amplifier .
To Next Speaker (COM terminal)
NC
2W
4
W8 W32WCOM
70 V
100 V
COM NC 32W 16W 8W 4W 2 W
16W
NC
2W
4
W8 W32WCOM
70 V
100 V
COM NC 32W 16W 8 W 4W 2 W
16W
To Next Speaker (terminal tap)
,
.
From Amplifier ,
To Next Speaker (terminal tap)
From Amplifier .
,
.
70V or 100V
Distribution System
Block Diagram
Te rminal Cover Plate
Cable Clamp
Adapter
d. Secure the wires to the appropriate taps on the captive
screw connectors of the 7-connector terminal block (on the
transformer side of the cover plate) as indicated on the tap
label. See the note below.
The black, negative (–) wire attaches to the “COM” terminal,
and the red, positive (+) wire attaches to the terminal tap
showing the correct wattage.
See the diagram at right.
NOTE: Observe the 70 V or 100 V system designation
as indicated on the tap label.
2.75” x 0.75”
NC2 W4 W8 W16 W32 WCOM
70 V
100 V
COM NC 32 W 16 W8W4W2W
e. Use a small flat blade screwdriver to tighten the
terminal block screws.
f. To wire additional speakers, route speaker wires
from the second speaker through the cover plate
hole to the transformer terminal block. Twist the
black negative (–) wires together and twist the red
positive (+) wires together before inserting them
into the terminal block. Additional speakers can be
daisy chained this way.
See the diagram at right.
3
8. Connect the two 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.
From Transformer
Red Wire ,
Transformer Cover Plate
Rear of Speaker
Black Wire .
c. Proceed to step 10.
Extron
SF 228T
Two-way Ceiling
Speakers
Ceiling Tile
Rails
2' x 2'
Ceiling Tile
Red Wire
Black Wire
From Amplifier
One Speaker
From Amplifier
Red Wire
Black Wire
To Second Speaker
From Amplifier
To Second Speaker
Two Speakers
9B
9A
Direct 8 ohm Connection (Bypassing the Transformer)
9. Direct connection from the amplifier to the speaker connection
bypasses the transformer.
a. Strip 3/16 inch (5 mm) from the ends of the two speaker wire
leads (+and –) coming from the amplifier.
Keep the wire strands together by twisting them (do not tin
the wires). Connect the red positive (+) wire to the +speaker
terminal and connect the black negative (–) wire to the – speaker
terminal depending on whether one or two speakers are being
connected as shown below.
Complete the Installation
10. Flip the terminal cover plate back so the transformer side is in,
then replace the cover and tighten the two cover plate screws
loosened in step 3.
11. Test the system and speakers by powering on the amplifier
and listening for the correct response from the speakers, then
disconnect power from the amplifier.
12. For installation in a 2 feet x 2 feet ceiling tile, place the speaker
on the existing support rails of the previously removed tile as
shown on the right.
b. For two speaker connection first twist the red wires together, the
twist the black wires together. Connect the red positive (+) wires
to the +speaker terminal and connect the black negative (–)
wires to the – speaker terminal.
4
68-2018-50 Rev. A
04 11
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Inside USA/Canada Only
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+971.4.2991800
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©2011 Extron Electronics All rights reserved. www.extron.com
For installations in a 2 feet x 4 feet ceiling tile
(cut in half in step 2), install the supplied T-rail
crosspiece as shown on the left.
13. If seismic support lines are being used, install them
now. Extron recommends at least two tie offs. In
addition to 13a, tie off either 13b or 13c. See
illustration at right.
NOTE: Observe all applicable building
codes and local ordinances during
speaker installation.
Existing
Ceiling Tile
Rails
T- rail
Crosspiece
(supplied)
2' x 4'
Ceiling Tile
Extron
SF 228T
Two-way Ceiling
Speakers
CAUTION: Repeated bending of the tab may
cause it to break off.
Attach the seismic safety
cable to either tab.
Anchor the safety cables
to a suitable secure point.
Seismic
Safety
Cable
Bend tab up.
Attach a safety cable
to a line retainer loop
at either 13b or 13c.
13c
13d
13a
13b
Shut off power to all connected equipment.
Temporarily remove a ceiling tile adjacent to
the speaker and set it aside.
a. Attach a seismic support cable to one
of the seismic bendout tabs located on
either side of the speaker.
b. Attach a second support cable to the
seismic loop located on the speaker
plate.
c. If a seismic support cable has not been
connected at 13b, attach one to either
loop at 13c.
d. Attach the end of the support cables to
a sturdy part of the building (studs, roof
struts, or similar framing).
e. For additional support lines repeat as
needed. Refer to the SF 228T User Guide
for further details.
f. Replace the ceiling tile.
Set the speaker in place in the ceiling and
position it so the speaker edges are hidden
by the existing rails or T-rails.
14. Check all wiring before powering up the amplifier.
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