Extron electronics SF 228T Setup Manual page 3

Connect the two wires from the transformer to the speaker.
8.
Keep the wire strands together by twisting them (do not tin the wires).
a.
Connect the red positive ( + ) wire to the + speaker terminal and connect the black negative (–) wire to the – speaker
b.
terminal as shown below.
From Transformer
Black Wire .
Red Wire ,
Proceed to step 10.
c.
Direct 8 ohm Connection (Bypassing the Transformer)
Direct connection from the amplifier to the speaker connection
9.
bypasses the transformer.
Strip 3/16 inch (5 mm) from the ends of the two speaker wire
a.
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.
For two speaker connection first twist the red wires together, the
b.
twist the black wires together. Connect the red positive ( + ) wires
to the + speaker terminal and connect the black negative (–)
wires to the – speaker terminal.
Complete the Installation
Flip the terminal cover plate back so the transformer side is in,
10.
then replace the cover and tighten the two cover plate screws
loosened in step 3.
Test the system and speakers by powering on the amplifier
11.
and listening for the correct response from the speakers, then
disconnect power from the amplifier.
For installation in a 2 feet x 2 feet ceiling tile, place the speaker
12.
on the existing support rails of the previously removed tile as
shown on the right.
Transformer Cover Plate
Rear of Speaker
9A
One Speaker
9B
Two Speakers
Extron
SF 228T
Two-way Ceiling
Speakers
Ceiling Tile
Rails
Red Wire
From Amplifier
Black Wire
Red Wire
From Amplifier
To Second Speaker
From Amplifier
To Second Speaker
Black Wire
2' x 2'
Ceiling Tile
3