Speaker System Wiring Using a Line Out

This diagram illustrates a system installation with an external amplifier and subwoofer connected to zone 2 on the stereo using a line out. You can connect an amplifier and subwoofer to any or all of the available zones on the stereo.
NOTE: You can connect speakers to the speaker wires for the internal stereo amplifier while using the line out on zones 1 and 2, although adjusting the volume affects both the speakers connected to the internal amplifier and the line out. This may result in uneven volume levels.

Wiring diagram with callouts

1

Zone 1 speakers

2

Water-tight connection

3

Zone 2 speakers

4

Amplifier-on signal wire

You must connect this wire to each amplifier connected to a zone line out.

A connected amplifier must use the same ground (-) as the stereo for this signal wire to function correctly.

5

Powered amplifier connected to the zone 2 line out

6

Zone 2 line out and subwoofer out

Each subwoofer cable provides a single mono output to a powered subwoofer or subwoofer amplifier. You may need to use an RCA splitter to connect this to an amplifier.

7

Subwoofer

GUID-93B550BE-32FB-4B88-B776-F28617ABA7D5 v4
August 2025