After applying the diagram modifications, plug the card into a modern test bench (even a Pentium III will do).

The volume switch is a potentiometer located on the subwoofer housing. Common Fix : Intermittent sound or "crackling" is often caused by oxidized contacts in this potentiometer

The satellites (2W RMS) and subwoofer (5W RMS) are often driven by separate pins on the same or adjacent amplifier chips. Signal Path & Volume Control

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