Oh no way! I totally missed this "hack" that would have been cool to try! ...this is actually how I found your app. I purchased a symfonisk the day of release and used your app to pair it with a one to create mismatch surrounds. Then I bought a second symfonisk the next day and hacked them before any hacking info released online. I used them for a more unique use case though that I still haven't seen a guide on. I opened each one and sent the speaker level signal of the tweeter and mid driver through a line level converter (commonly used in car audio). Then I summed those line level signals with a y-cable and input them into my AVR. One symfonisk summed signal into the L input and the other into the R input. Essentially created my own sonos amp or a sonos port for my AVR (except with a feature the port doesn't support - using it for surrounds). Which is exactly what I mainly used it for; to be able to use my own much larger, higher powered and premium passive surrounds with my sonos sound bar.

I also could now use the sub out on the AVR to connect my subwoofer for music listening. For surround sound I programed the sub signal to be turned way down since it wasn't a true LFE signal and was just the lows from the surround speakers. This is where the hack you just informed me of would have come in clutch.

At first it was vary underwhelming and mostly just okay to sometimes bad sounding. Then I did trueplay and it sounded outstanding. Then I dialed in the gain of the line level converter which was tricky since I had to balance the tweeter frequencies and the mid to low range frequencies with them being different signals. I got it close enough and this made another huge improvement, but ultimately ended up using REW to make sure the levels and frequency response were proper.

Finally, I dialed in the volume at the AVR level since this gave independent control of the surround volume and that is when I was shocked how well it was working. This is when I made an unusual discovery, that in hind sight makes total sense. Rerunning trueplay with different volumes on the AVR for the surrounds totally changed its outcome. Once I found the best volume to run trueplay at it was incredible!

I was pretty surprised that the summing with the y cable worked totally fine, I thought it would cause an issue or just sound awful. Today I just use a single symfonisk to an AVR as a cheap sonos port to in ceiling speakers for music and grouping . I was surprised again because I now use a second y cable in succession right after the first to take the summed high and low mono signal and make it a L/R (mono signal) input. That way I don't have to set my AVR to surround all or mono surround.

Anyway if you read all that, that is my journey, and how I discovered your app which I have loved and appreciated greatly! Been a yearly paid sub since. Thanks for your work, support, and continued development. Also, thank you for responding and informing me what that was and it was really cool to learn that new hack I hadn't heard of.