The main reason that people experience less good bass and integration is often wrong installing of the main speakers .
The main speakers must play good bass all by themselves , before you integrate them to a subwoofer. You have to find the right placement in the room for them .
1. Turn off your subwoofer .
2. Use the tunemethod to find the best place for the speakers in the room where your WII plays bass tunes the best without subwoofer.
3. When this is done - If you have only one subwoofer , place it exactly between your WII at the same speakerwall. Try 70 Hz crossover as a start . Turn on the subwoofer . Put a sock in the bass tubes for the WII, making them closed boxes .
4. Find the right volume for the subwoofer to gel with the bass tunes from your WII .