I tested multiple ways to add a powered sub to my Sonos home theater using my Symfonisk hack and found a super cheap and easy way to build a full 5.1 system for under $700 - that’s the same price as the Sonos sub alone! Recommended subwoofers on Amazon ~$100: Polk 10" - https://amzn.to/2RcWV1q Monoprice 8" - https://amzn.to/3696umd Monoprice premium 8" - https://amzn.to/2Rdl73O Acoustic Audio 8" - https://amzn.to/2TVfCZt Note: any subwoofer brand or size will work as long as it's amplified and has speaker level inputs - if it only has RCA inputs, look elsewhere. Beam - https://amzn.to/38nJMbA Playbar - https://amzn.to/36buDsk Ikea Symfonisk - https://www.ikea.com/us/en/p/symfonisk-wifi-bookshelf-speaker-black-00357561/