Thank you for taking the time to post and welcome to the Bose Community. I hope your Acoustimass 10 has served you well so far!
I'm sorry to hear you've noticed your subwoofer is out, but we're able to help you with this. My best advice would be to contact Bose support to look into the available service options, to have things resolved! Give the team a call and let me know how you get on, or if you have any further queries regarding this.
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