![Beneath the IO label of the Bose Companion 20, there is an additional circular port above the 'Audio In' port. What would this be? : r/bose Beneath the IO label of the Bose Companion 20, there is an additional circular port above the 'Audio In' port. What would this be? : r/bose](https://i.redd.it/hua8qt40s1k61.jpg)
Beneath the IO label of the Bose Companion 20, there is an additional circular port above the 'Audio In' port. What would this be? : r/bose
![Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics](https://m.media-amazon.com/images/I/71gs4d7ZgeL.jpg)
Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics
![Amazon.com: HQRP AC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 329509-1300 PSM36W-180 Power Supply Cord Adaptor + Euro Plug Adapter : Electronics Amazon.com: HQRP AC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 329509-1300 PSM36W-180 Power Supply Cord Adaptor + Euro Plug Adapter : Electronics](https://m.media-amazon.com/images/I/81yNjsdIQCL._AC_UF894,1000_QL80_.jpg)
Amazon.com: HQRP AC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 329509-1300 PSM36W-180 Power Supply Cord Adaptor + Euro Plug Adapter : Electronics
![Bose Companion 20 Multimedia Speaker System - Silver - Excellent Condition - electronics - by owner - sale - craigslist Bose Companion 20 Multimedia Speaker System - Silver - Excellent Condition - electronics - by owner - sale - craigslist](https://images.craigslist.org/00H0H_7iLApE98BIA_0t20CI_600x450.jpg)