Hi,

Earlier today I was playing with the placement of my sub mini to get rid of some unwanted boominess around 50hz.

After finding a spot that sounds better, I noticed that if I lower the subwoofer level to the minimum (-15), the bass boominess at 50hz is back. And… it seems to be coming from the arc ultra!! In other words, it seems that adjusting the subwoofer level seems to affect how much bass is played by the ultra vs sub.

I'm pretty sure this is not how things worked in other sonos soundbars I tried, or the sonos amp I own. In those cases the crossover frequency is set at a fixed level - anything above is sent to the soundbar and anything below to the sub. And the sub level is just a gain control for the sub output.

But my feeling is that, for the ultra , sub level is controlling both the gain AND the crossover between the bar and the sub. I find this is making it harder for me to integrate the sub in my system (in fact, my usual sub placement no longer works, as it sounds too boomy for my liking).

Anybody else has observed this weird behaviour? Is it “by design” or is this some kind of bug? It's almost as if the system is trying to use both the sub mini and the sound motion sub to better spread the bass (as in a dual sub setup).