1. Make sure the Spark amp and the Spark CAB are both powered on.
2. Make sure the 3.5 mm audio cable is plugged into the Spark amp and the Spark CAB properly.
3. Make sure the volume on the Spark amp is turned up.
- For Spark 40, please turn up the "MUSIC VOLUME" knob on the control panel.
- For Spark MINI, please turn up the "MUSIC" knob on the control panel.
- For Spark GO, please turn up the volume by rotating the golden wheel on the Spark GO in a clockwise direction.
4. Make sure the Input Switch on the rear of the Spark CAB is switched to the left.