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Its there if you would like to wire your sub to the soundbar instead of wirelessly attach it. Or if you want to wire one and buy another one and have a second sub somewhere else wirelessly.
Sorry, there was a problem. Please try again later.Hello Annie, great question! The 3.5 mm Acoustimass input on the back of the SoundTouch 300 soundbar is for an optional wired connection to the Acoustimass 300 wireless bass module, rather than pairing the two wirelessly over Bluetooth. Have a great day! Josselyn - Bose Support
Sorry, there was a problem. Please try again later.These holes are for the Bass you want to place the bar about one foot in front of a wall it will actually use the environment to create what's called Stadium sound and give you a much Fuller experience I have a YouTube channel and I have made 3 videos that might be of help. Due to policy I cannot leave you a link but if you just Google JBTechfanatic I should come up and just look for my soundtouch videos. I hope this helps enjoy your new system.
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