Line-In Latency/Delay Disable PLAY:5

As a former 70s disco DJ  I too would love to live mix using Sonos wi fi system. The delay makes that impossible. I believe the answer simply is for Sonos to update it’s software to incorporate Bluetooth  (in addition to the wi fi and  hired wired options). Alternatively, a streaming app, such as DJ Algorridm could possibly explore a software update as well to be compatible with So is). I think the better answer is for Sonos to take the step to enable Bluetooth as does Bose and practically every one of Sonos wireless audio competitors. 
Kudos  otherwise to Sonos for great audio performance 

Sonos does support Bluetooth, on the Move. One does actually need to have the requisite hardware, which the other players lack.

But regular Bluetooth wouldn’t help your use case. The default SBC codec typically has 100+ms of latency. 

Sonos simply isn’t designed for DJing.

I’ll add another request for the low latency line-in option. My use case is similar to a previous poster - small home office with line in from PC. My preference is for my Sonos to handle both “business and pleasure” - streaming music normally while I work (latency unimportant), and as PC speakers for gaming/youtube after hours (require low latency). Ideal setup would be line-in to one play 5 that links with another play 5 and sub in stereo pair configuration over low latency 5GHz dedicated network link similar to Playbar/surrounds. It is frustrating to find out after purchase that the line-in delay makes this less than optimal as a solution.

To quote Sonos marketing:

“Everything works together, and Sonos works with all your favourite services so you can listen to what you want, where you want, how you want.”

Perhaps this should read:

“Everything works together, and Sonos works with all your favourite services so you can listen to what you want, where you want, how you want - unless you want to use Sonos for PC gaming, Youtube streaming, DJ turntables, electronic drums….”

Sonos is not really the flexible solution it claims to be in marketing. It is a very reliable and stable experience within the bounds of its core use case - wireless multiroom streaming - but is too rigid in its design to be the complete home solution claimed in the marketing.

so is it correct that Sonos cannot work with line-in without any latency?

I have several sonos products and really like them and have been really frustrated last week when I tried to connect it to my imac as a speaker with line-in connection, but the latency is super frustrating and makes the sonos play 5 useless as a product.

how hard can it be to update the app so it would be possible to adjust the latency settings or take away the latency if you use line-in

Yes, it is correct that the line in latency can not be reduced at this point in time. 

Not knowing the code base, versus the underlying design for synchronized whole home music, which is the basis of the existence of Sonos, I don’t know how difficult such a change would be. I do know that if I was looking for a direct pass through speaker, Sonos would not be on my list of possibilities, similar to how I wouldn’t pull a horse trailer with a Ferrari automobile. There are, as has been said many times in these forums, horses for courses.  

I like your comparison with the horse trailer, so why have they put a trailer hook on the Ferrari, which you cannot use propperly?

They haven’t.  You mistook a buffered for multi-room line input as a trailer hitch. In short, Sonos in no way advertises itself as a real time performance type speaker.  Nowhere does it say it is suitable for DJ’ing, PA, or live music.  So not only does the Ferrari not have a trailer hitch, nowhere in the Ferrari literature does it say a trailer can be pulled.  

With Sonos stopping the availability of updates for products like the Gen 1 Play 5 starting in May 2020, this line-in delay is even more of a nuisance.  It would be nice to pull it from use as a streaming speaker and use it for something like a TV or computer speaker but the delay prevents this possibility.  I just bought our Play 5 Gen 1 five years ago and it is already antiquated it seems...

and it’s 2020 you thought they would solve this simple problem by now. they just don’t give a damn about the live music producers. 

i love your speakers sonos but this delay thing sucks.

your engineers can’t handle local mode?

we can just have both speakers setup in local modes and hook it up with left and right channel as stereo, i don’t think this is too much to ask

You are correct.  They don't care about live music producers because their speakers simply were not designed for live music producers.  There are plenty of other purpose specific speakers, amps and/or PAs out there designed for live performance, why would one waste their time on one that is not even designed for that purpose?