Extron electronic SF 228T manual Terminal Cover With Transformer Side Exposed

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

(Black) To Speaker . Terminal

(Red) To Speaker , Terminal

Transformer

Transformer

Terminal Block

Tap Label

V

COM
70	V

				NC
			2W	2W
			4W	4W
		8W	8W
	W		W
W	16	W	16
32	NC	32
COM
100

Cable Access Opening

Black (-)

To Second Red (+)

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.

V

COM 70 V

Red Wire

From Amplifier (+)

				NC
			W	2W
			2
			W	4W
			4
		W	8W
	W	8
			W
W	16	W	16
32	NC	32
COM
100

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