How to pair wireless subwoofer (GS335) with sound bar (GS331 and GS333)?

Please follow below steps:

1. Turn on your subwoofer (GS335) and GS soundbar (GS331/GS333)
2. Press and hold the pair button on GS335 to initiate pairing. At the same time, press and hold the source button on GS331/GS333 for 3 seconds to pair with GS335.
3. The light indicator will turn on solid blue when all of them successfully paired.