I only know of two ways to partially mute the subwoofer. You can reduce the subwoofer volume by using your soundbar remote. Lower it to "0". The other way would be to turn off the subwoofer entirely by pushing the button on the back of your subwoofer and use just the soundbar. The first method will give you more flexibility in raising and lowering the subwoofer volume and the second method eliminates the subwoofer entirely.