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Hello Dinhtruong, thank you for asking about this feature. It is a non-functional connection found on early production units and has been removed from the module. If you would like to connect a 2nd Acoustimass module to your system, 2 modules may be connected wirelessly to the SoundTouch 300 soundbar or the Lifestyle 600/650 home theater systems. Hope this helps! Have a great day, Suzanne – Bose Support
Sorry, there was a problem. Please try again later.dont know. Bose is very proprietary, so I doubt it
Sorry, there was a problem. Please try again later.The sub input is so you can hard wire the sub to the soundtouch 300 sound bar.
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