Turn any hifi speakers into bi-amped Sonos speakers (with optional sub) by hacking Ikea Symfonisk
I've been tinkering with using a pair of Ikea Symfonisk speakers as a way to bi-amp a much better quality set of speakers by adding binding posts on the back to tie into the Sonos amplifiers and using DC switches to cut off the internal drivers so I can just use this as a Sonos amp if I want. I also cover some experiments on whether to include Trueplay when calibrating.
UPDATE: Folks have been asking about the driver impedance and a viewer measured them. Woofer is 4 ohms, tweeter is 7 ohms (would round up to 8 ohms). I'd stick with using drivers that are in the 4-8ohm range but the closer you get to 4 ohms for the woofer and 8 for the tweeter, the more balanced it may sound.
These are the switches I used to disconnect the internal drivers:
https://www.amazon.com/gp/product/B07...
These are the style of binding posts I used - warning these were pretty poor quality so I'd look for a better brand:
https://www.amazon.com/gp/product/B07...
Recommended subwoofers on Amazon ~$100:
Polk 10" - https://amzn.to/2RcWV1q
Monoprice 8" - https://amzn.to/3696umd
Note: any subwoofer will work as long as it's amplified and has speaker level inputs - if it only has RCA inputs, look elsewhere.
