I believe there were only ever 2 version of the connect amp.

The first one had 4 Ethernet ports on the back (zp100), and the second one had only 2 Ethernet ports (zp120, Connect:amp).

The second gen has newer hardware, zp100 is an old model by now.

It looks like you have the latest one.
They went through a few different cosmetic changes throughout the years (logo change, feet color changes etc). Features remained the same: the hardware remained unchanged.

Moderator note: There was a change to the Connect:Amp and Connect in 2015 that upgraded some of the internals. One of the easy ways to check is on the button on the front. If it has the Play/Pause, it should be one of the newer ones.

FYI, I have both of these series, and they look the same and work the same, but now that the Connect:Amp is announced as End of Life, I see the P100 is the obsolete model and the C100 is still reported as “Modern”. 

I’ll have to wait until I get home to see if this is shown on the label.  The other way you can tell is the serial number.  My old/obsolete P100’s all start with 00, the “Modern” P100 start with a 3 or a 5.  Looking at eBay it seems the older model *might* be labeled ZP120, and the newer model as CTAZPUS1.

Thanks bferrell, really helpful info!!

@bferrell, I am able to back your theory re. the C100 model appearing to continue receiving support but mine (bought in October 2015) has a 00 serial number and is designated “Modern product”:

Connect:Amp: Living Room
Serial Number: 00-0E-**-**-**-**:C
Version: 10.6.1 (build 54272160)
Hardware Version: 1.17.3.1-2
Series ID: C100

I also have a mix of connect amps and can confirm. 
 

P100 is considered obsolete 
hardware version - 1.16.3.1-1

C100 is considered modern

hardware version - 1.17.3.1-1

Both were purchased and installed at the same time 4 years ago. 1 is modern, 1 is obsolete. 
 

whats jammed is that because they were changing the internals only you’d never know which version you were getting. Not a problem at the time but per Sonos new direction, the old p100 is junk and will need to be removed less the rest of my modern system will be left behind.

4 years later now I find out that I was sold old hardware. 

If you don’t have access to the About of your device, there are a couple other ways to check.

If you check out the serial number on the unit itself, there should be four digits at the beginning before the 00 that marks when the unit was manufactured, looking like YYMM. There was an update to the Connect:Amp in 2015 where some of the basic computing internals were upgraded. At the time, it wasn’t noted with a generation change, though we learned from that and did so in later years.

The 2015 Connect and Connect:Amp units have that Play/Pause button as well.

The newer version of those devices are not legacy devices, but the older version is now a legacy device.

The serial number on both legacy and modern start with B8-E9-37. 
 

the question is what is Sonos going to do for their customers who were deceptively sold old stock which in turn had as little as a 4 year fully functional lifespan?

If you got old stock I’d start with your seller and see what they tell you. Once you have done that then contact Sonos support directly and discuss the issue.

It has been a while but Sonos was quite helpful is fixing the mess Best Buy put me in by selling me not only old stock but old stock that had spent a couple Phoenix, AZ summers sitting in a steel shipping container in the full summer sun. I’m surprised it worked at all and it didn’t work long. Best Buy was not interested in fixing things, Sonos once I proved Best Buy had screwed me made things right even though it was no fault of theirs.

Take another look at the serial numbers, you are just seeing the MAC portion, there should be more numbers ahead of that.

ZP0606 XX-XX-XX-XX-XX

The 0606 is 2006 and June, YYMM.

Got it Thanks

Same issue for me.  I have six connect:amps, all purchased and installed at the same time in 2015.  Now it appears one of the six is a legacy product even though it was retailed at the time with the same specs as the rest.  What is different about the “legacy” connect:amp variant that renders it unable to accept ongoing software updates after May 2020 to remain operable with the rest of the modern system?

All legacy devices have 32 MB RAM and storage.  All modern devices have more (some 32 times more).  The modern Connect:Amp units have 64 MB RAM and storage.  See this thread for a graphic:

Updated memory graphic

Hi

I have two Connect’s and one apparently is legacy, the other modern.  The above has been interesting, thanks.   In retrospect changing specs in a model that continues *apparently* unchanged is not a good idea, Sonos!!!

Is the info about what is modern and what is legacy, within a model, online anywhere official?  Sonos?  It should be.

Sonos has learned the invisible model change lesson so hopefully we are done with that.

I’m not sure they learned the confusing names, like the Play 1 versus Sonos One naming lesson though.

Can you please tell us when exactly the model change in 2015 was?
How about a device from starting with a serial number “1501” or “1502” which would mean January or February 2015 - are they considered modern or obsolete?

Hi, I have 2 x connect:amps and I am trying to decide if I should be upgrading to the new S2 app/operating system. I have read the above answers and many other sources but still can't find a definitive answer.

I can't find the year in the serial number like mentionsed above, and if I look in the products in my system it doesn't say if they are "modern" or "discontinued" (see pic). I'm not sure what the registration dates refer to as they were installed and registered in 2018. I'm guessing this has been done automatically by Sonos in readiness of the new app.

I'm fairly sure they are modern as they are C100 and not P100, but this is incredibly frustrating!

If they're suitable, am I then OK to move to the S2 app? What are the benefits for doing so?

Any help would be appreciated.

If they don’t say Sonos S1 Required next to them, then they’re modern.