A:Answer Hello, Greg.
This is a great question, and we're glad to help. The SoundTouch 300 soundbar currently supports up to 2 bass modules, and one pair of surround speakers. The system supports the new Acoustimass 500 and Acoustimass 700, the Acoustimass 300 bass module, the Bose Surround Speakers, and the Virtually Invisible 300 speakers.
If you have any additional questions, our support team would be glad to help at 1-800-367-4008. They are available M-F 9 AM to 9 PM Eastern. Thank you, and have a great day!
Jesse - Bose Support