Hi @Arron Small,
While I don’t have any first-hand experience with that setup, one of our community members has, and they’ve shared their thoughts in this post that I’ll link below.
By me replying to this thread it will also bump it up further in case any other community members want to share their experiences with dual Subs 
Ok, I’ll add another thought, since I’ve not done this either, it may not be worthwhile, but….
You’re asking for a subjective opinion. I suspect it really depends on what music you enjoy, and what bass you’re expecting to hear. Since Sonos offers a return policy, your best bet would be to get a second sub as a trial, and test it for yourself to see if it works for your environment, and your own expectations. If it doesn’t, return it. If it does, keep it.
For me, if I had a much larger living room, and wasn’t concerned about the neighbors so much, it might make sense, in my case particularly with movie watching, since the music I tend to listen to isn’t bass heavy. But that’s me…and I just don’t know enough about your situation to suggest whether there’s enough value in the proposition. So, do your own evaluation, and tell us how it works for you.
Thanks for your response @Airgetlam. My house is detached and tbh I do listen to bass heavy music etc. I guess there’s no harm in getting a second as you said. It’s always tricky cause there are no dedicated Sonos stores that have demonstration living spaces to experience the sound of different set ups. I’ve already spent a fair bit and really am enjoying the set ups capabilities. What harm can a second Sub really do lol. Once I get the second, I’ll provide feedback.
I’d certainly be interested.
The challenge is we all have different tastes, and different ears. There just isn’t an easy way to tell someone anything other than what works for them, on a personal level. This is why that ‘trial’ that Sonos offers is such a great thing. My situation will never be the same as yours. ;)
