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The subwoofer can be adjusted by pressing the Menu button on the sound bar remote then using the arrow buttons to select Subwoofer. From there you can use the + or - buttons to adjust the volume. The same steps are used for adjusting the rear speakers instead of subwoofer select surround. If you have any questions feel free to contact us at chat.vizio.com or at 1-877-878-4946. Thanks -Randal
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