The characteristics of sound waves means the location of your Sub Mini will affect the sound it produces. Plug it into a long extension cable and then try it out in different positions around the room; you might find a more satisfying position for it, even as a single unit. 

Thanks nik, but that’s really not a good option for my room.  Bottom line, I know that a second sub mini would sound amazing and truly fill the space.  It’s just kinda weird that Sonos doesn’t want my money.  After all, they know how to make two sub gen 3/4’s work in tandem, so I can’t imagine it would be that hard to also allow that feature in the sub mini.

Sure it’s a fairly niche use case, but so in having two big subs in the same room. Just take my money sonos 

Just sayin’

So moving the existing Sub Mini is not an option, but you can place a second Sub Mini somewhere in the room? I hope Sonos introduces the option for multiple Sub Minis soon then. 

I should have elaborated. Yes there is room on the opposite side, but that would create the same problem in reverse. Whichever side the sub is on gets more bass

And again, its  not like I’m suggesting something crazy here. Sonos allows you to use a dual setup with their big subs, and theres planty of people who use 2 of them - in order to spread the bass across the room more evenly. I just prefer the tighter sound of the sub mini - so like those who find it useful to have dual big subs, I’d like to have dual sub minis

So far, the only way is by creating a second setup. If you dont want to spend in Ones or Eras, some people buy an used symfonisk (ikea) and pair it to a second sub mini, then group them. You will need to fisically disconect the speakers in the symfonik if you dont want to hear that one, but the sub mini will still. The symfonik ca be hidden anywhere in the house.

So my question is, right now my setup is an arc, a sub mini, and two era 100’s.  Lets say I got a second sub mini, paried that to the era 100’s and paired the first sub mini to the arc, then group all of them.  Would that result in any degradation of the sound?  

Side note, I do NOT currently use the era 100’s as ‘surrounds’.  I have them set to ‘full’ in the app (rather than ambient).  I use them as front speakers to widen the soundstage.  I love the effect and the setup sounds amazing to me.  As another side note, I don’t have any room behind the couch to properly place them as surrounds anyway.

When Sonos first created synchronised multi-room audio capability, they did so by delaying the stream of audio data by 70(75?)msec. For most audio this didn’t matter - there’s no visual cue for it to matter. With their home theatre systems, lip sync issues meant they dropped the delay for  audio signals to about 30msec. For the home theatre room (be that just an Arc or a fully configured Arc/dual Era effects speakers and dual Subs) this is fine. But when grouping another room and playing the video audio, the delay of 70msec still applies. The result: audio to the home theatre room is 40msec ahead of audio to other rooms. This results in an echo effect. Some folk on here have said it’s not an issue for them, whilst others find it unacceptable. You already have the 100’s so you can remove them as surrounds, set them up as a new room, and listen for yourself. 

Thanks for that info!  Appreciate your knowledge.  Given that extra ‘delay’ I will just keep my system as-is and live without a second sub mini.  

You did just save me $400+ dollars.  But still, if Sonos would just make two sub mini’s work together like they do with their big sub, well I’d throw my $400+ at them faster than you can say ‘overkill’ 

You might put a long extension cord on the Sub and experiment with alternate placements. It can take some time but in most cases a location for a Sub can be found that interacts with your room to provide reasonably level response.

Not every room, but still worth a try.

If you set up a subwoofer right, you should not be able to pinpoint where it is. Your statement “Whichever side the sub is on gets more bass”, while being true in some cases, should not be true if you’ve set the sub up well.

I dont’ know how much I have to stress this point, I know placement matters, but I still think a second sub mini working together would be great.  If what you’re saying holds, then why on earth does Sonos support two big subs in the same ‘system’?  And there’s plenty of people who find it valuable to have two big subs!  Do you think those people who buy two big subs are idiots?

Why should those who prefer the sound of the sub mini be restricted? - unlike the people who prefer the sound of the big sub. 

As a side note (but important):  Plenty of reviewers find the sub mini to have a ‘different’ kind of bass than the big sub, even though the frequency response graphs are quite close.  Many say the sub mini has a ‘cleaner’ or ‘tighter’ sound.  I totally agree, and prefer the bass of the sub miini vs that of the big sub.

You can argue all day long that it wouldn’t make a difference to the sound to add a second sub mini.  But again … sonos allows it (with the big sub) and plenty people do buy two.  Explain that to me and I’ll be glad to listen.

Investigate 3rd party apps that will allow dual Sub Minis to be used.

As I understand it the second Sub is to handle the bass in a more subtle way. This could mean it is of use to people that can pinpoint the single Sub now, see here for an example

 What I am saying is that you’ve not placed or set up your Sub right if you can pinpoint where it is. It could of course be that this is unavoidable in certain room lay outs - this means people using two Subs for this are more unfortunate rather than that they are idiots, as you would say it.

Sonos must have their reasons for this, and they could be more transparent about why they will not allow the use of two Subs Mini’s. These reasons could be based on sound quality, since one Sub Mini is already very subtle two could not enhance the experience enough to justify the price of the second Sub Mini. They could of course also be commercial - if you rally want the most out of your Sonos system buy two Subs.

On what basis are you justifying this statement?

Maybe “more subtle than a single Sub” would have been a better way to describe my understanding of the Sub Mini. That is mainly from reading about it though, so is my impression wrong?

I don’t own, nor have I heard the Sub Mini, but from reading reviews and other users experience of the Sub Mini in their systems, I didn’t get the impression the addition of a Sub Mini was “very subtle”. Sure, the Sub Mini is not going to match the Sub, but that’s not how I read your post originally hence the question.

I have the mini sub linked to a beam in one room. It sounds great, and it's a decent sized room. Very punchy and tight bass response. It's definitely not subtle. Very impressive unit. 

Meanwhile in another room I have the Arc, big sub (gen2) and 2 x play 1s in a 5.1 setup. It used to sound great but something has changed over the last ~18-24 months. It now sounds muddy and is hard to listen to. I've done the crawl test, truplayed it to death. Slight improvement but nothing like what I remember it sounding like. Maybe there's a fault with it or something. 

Because the sound of the mini sub in the other room is so good I thought I'll just swap the large sub for 2 mini ones. But nope, sonos don't support that for reasons known only to them. I seen a post by ​@Corry P that it was marked as a feature request 7 months ago so fingers crossed. Maybe Corry can update us?

I get the "one big sub has a better bass response and is cheaper than 2 mini subs" view. That's fine on paper but we all know every room and our preferences are different.

I've had sonos speakers since 2010 and my house is now full of them. I can live with all the app issues as long as the speakers sound good. But the room in my house that has the most expensive speakers in it sounds the worst  

Hi ​@GleannanIolair 

There is no update to give - you can still only bind one Sub Mini to a Home Theatre system.

I hope this helps. 

Couldn’t agree more.  And the silly thing is, it’s money Sonos is leaving on the table, for lack of what should be a relatively simple firmware update.