To connect a subwoofer to an amplifier without a dedicated subwoofer out, the most effective method is to utilize a "Y" splitter cable.
Prerequisite:
Before making any cable connections, always ensure that both the amplifier and subwoofer are turned off.
Procedure:
- Remove the PRE-OUT / MAIN-IN jumpers located on the rear of your amplifier.
- Replace the jumpers with "Y connectors", with the male side connecting to the "PRE-OUT".
- Connect one of the female sides to the "MAIN IN", and the other female side of the "Y connector" to the subwoofer. (In most cases, RCA cable extensions will also be required.)