5
Planning your power connections
The power end plates of the Zapco ST-X SQ amplifiers carry the power connections
and the speaker connections and vary somewhat by the number of channels.
For example, the power end of the ST-4X SQ below has (of course) speaker
connections for four channels. The ST-X SQ amps all have on-board fuses and
the fuse rating as printed above the fuses. The main 12-volt power input, the
12-volt turn-on wire, and the main Ground connection are common to both
models.
• The large connection at the interior of the end plate is the main power
input. This must be connected the vehicle battery's positive (+) terminal,
and a main system fuse should be placed close to the battery
• The large connection at the outside of the end plate is the main ground
or negative connection. This must be securely attached to bare metal at
the vehicle frame, or other heavy chassis component with a direct
connection to the frame
Note: Seat bolts and seat belt bolts are NOT good ground points
• The small terminal between the main power and ground is the +12
turn-on input and can be connected to the head unit turn-on output wire.
If none is available it can be connected to an accessory (ACC) terminal.
You should avoid using any ignition-on (IGN) wire, as they can be noisy
Note: The ST-X SQ amplifiers have terminals that do not require connectors. You simply insert
a bare portion of wire and tighten the connection with the supplied Hex tool. As the wire
conforms to the connector the connection can loosen. You should re-tighten the connection
after about a week.
Turn-on trigger wire
Ground to chassis +12 volt at Battery positive terminal
