I know this is an old post but just to clarify Sonos is not as good as a traditional 5.1 surround sound...
Sonos is very convenient and works well for what it is... but my denon receiver with klipsch speakers are superior.., like, by far... so much more depth... and for 800 dlls you could get a super nice sub, I really don't think the sub is worth it.,, I love the convenience... it's super easy to connect and setup, the ability to add a bunch more speakers is cool too... the sales guy told me it had "audiophile" leve quality sound... no way!
it must me compressed because of wifi or don't know...
but my denon system blows it out of the water... it's not even close! Seriously! Not even close, and for music is the same... the depth and clarity coming from my big speakers are in another level compared to the sonos.., but it does look sleek with my 86" oled ...
might get a second sub although it hurts because I could get a super nice svs ...