Sonos Connect - Very low sound since Feb 2026

Sometimes updates cause odd behavior, often a network refresh will restore normal operation.

Power down all Sonos Reboot router and controller, then power up your Sonos. 

Thanks ​@Stanley_4 I have tried all the usual fixes (including this) & still no resolution. I’ve had an hour long call with Sonos through a couple of levels of support but no further forward. It happened around directly after an update in February which would more than suggest that the update was the cause. Would also be a coincidence if 4 out of 6 Connects suddenly developed this issue at the same time, randomly.

Sonos are now talking about out of warranty (the Connects are all 3 years old) replacement which I assume comes with a cost...

 Are the 4 that have low volume connected via digital out?

​@MoPac none are digital out. The speakers go directly to mini amps and then each Sonos ‘Connect’ is connected to the next ‘Connect’ via ethernet and then last ‘Connect’ is connected to a network switch which in turn is connected to the broadband router.

I don't think the six deep dasychain on Ethernet should be a problem, at least it hasn't been. Still, I'd grab a cheap ($20 but not on the incompatible hardware list on the support pages) 8 port switch and split the incoming Ethernet there, eliminating the chain.

Kinda grasping at straws with that but it is cheap to try.

​@Stanley_4 The setup was working fine for 3 years but I do have another smaller switch I can slot in and it’s worth a try.

The fact that they are still working and giving output, albeit at a very low level, would suggest it’s not a connectiviity issue, I think...

Odd things fall out of updates, my suggestion is unlikely but possible and easy to test.

Hopefully support looked at all the other common issues.

Any difference in the manufacturing dates /  hardware versions that could explain the different results of the update?

​@Stanley_4  all hardware seems to be the same;

Version (17.2.4)

Build (86.6-75110)

Hardware Version (1.17.5.5-2.1)

I doubt that this daisy chain is suddenly the issue. A chain issue would result in missing or intermittently slow units. An easy test would be to temporarily disconnect one or more units from the chain or change the order of the network connections. Note that if you disconnect a unit, the disconnected unit will attempt to use SonosNet wireless. Unless there is some wireless congestion or you have disabled WiFi on that and the other units, there should be no issue with respect to the disconnected wired unit. SonosNet requires at least one wired unit.

I assume that you have checked the Line-In/Line-Out settings.

Note that, while unlikely, we cannot rule out a hardware issue with one or more of the CONNECTS. An update can rearrange the software memory locations and a defective, but previously unused area of memory can now be causing issues. You can test for this by systematically powering down each unit -- being careful not to break the network chain. Keep notes.

I'm out of easy possibilities, about all you can do is keep after Support for a fix. Since they are the only folks that can see the internal data all we users can do is poke at the external possibilities.

low or none RCA output has an rot cause in worn capacitors on ZP90/connect old type search google for solution

Your Connects are WAY more than 3 years old: at least six, up to 18 years old.

I am pretty sure they did something recently in software that hosed the S15s.  There are posts all over the forums that indicate that it's far too prevalent to be simultaneous and coincidental global hardware failure.  
I have gone ahead and converted all mine using DACs because the fiber port doesn't seem to be affected and I don't feel like getting in a slap fight with Sonos tech support.  If anyone hears that Sonos has issued an update that fixes the problem, I would be appreciative if they would post on this thread.

Hi Jens
I gave up with Sonos support. They were so slow that it felt like they wanted that outcome…
Sent the units to a local repair centre who specialise in Sonos and all sorted. Various components had blown in 4 x units - all the same components, all on the same day as an update…
Very poor support from Sonos, but all sorted elsewhere now.

Hello in have the same problem with 8 connect 😱

Since the update, it no longer works via the RCA outputs. Do you know which components might have blown?

Thanks in advance for your replies.

We’ll need a bit more information, but more simply, have you tried the RCA inputs (and appropriate setup) on another CONNECT? We don’t get to see the hard data when you submit a system diagnostic within 10 minutes of experiencing this problem like a Sonos Support person does, but I’d guess that there might be an issue with the electronics on the older device, for the line in. I would also be tempted to do the traditional repair option, by unplugging the device for two minutes, then plugging back in.

Of course, there is no real guarantee that it is the Sonos, it could easily be the device that is plugged in to the line in. Have you checked that device?

Translation:

We hebben wat meer informatie nodig, maar om het simpel te houden: heb je de RCA-ingangen (en de bijbehorende instellingen) al eens op een andere CONNECT geprobeerd? Als je binnen 10 minuten na het optreden van het probleem een ​​systeemdiagnose verstuurt, kunnen wij niet de gedetailleerde gegevens inzien die een medewerker van Sonos Support wel ziet; ik vermoed echter dat er mogelijk een probleem is met de elektronica van de oudere unit, specifiek bij de lijningang. Ook zou ik de standaardoplossing proberen: haal de stekker twee minuten uit het stopcontact en steek deze er daarna weer in.

Uiteraard is er geen absolute zekerheid dat het probleem bij de Sonos ligt; het zou net zo goed kunnen liggen aan het apparaat dat op de lijningang is aangesloten. Heb je dat apparaat al gecontroleerd?

Nous aurions besoin d'un peu plus d'informations, mais pour faire simple : avez-vous essayé les entrées RCA (ainsi que les paramètres correspondants) sur un autre CONNECT ? Si vous envoyez un diagnostic du système dans les 10 minutes suivant l'apparition du problème, nous ne pourrons pas voir les données détaillées qu'un agent du support Sonos verrait ; toutefois, je soupçonne un problème au niveau de l'électronique de l'ancien appareil, plus précisément de l'entrée ligne. Je vous suggère également d'essayer la solution classique : débranchez l'appareil pendant deux minutes, puis rebranchez-le.

Bien entendu, rien ne garantit absolument que le problème vienne du Sonos ; il pourrait tout aussi bien provenir de l'appareil connecté à l'entrée ligne. Avez-vous vérifié cet appareil ?

Wir benötigen noch etwas mehr Informationen, aber um es einfach zu halten: Haben Sie die Cinch-Eingänge (und die entsprechenden Einstellungen) schon einmal an einer anderen CONNECT ausprobiert? Wenn Sie innerhalb von 10 Minuten nach Auftreten des Problems eine Systemdiagnose übermitteln, können wir zwar nicht die detaillierten Daten einsehen, die einem Mitarbeiter des Sonos-Supports zur Verfügung stünden; ich vermute jedoch, dass ein Problem mit der Elektronik des älteren Geräts vorliegt, speziell beim Line-In-Eingang. Ich würde auch die Standardlösung versuchen: Trennen Sie das Gerät für zwei Minuten vom Stromnetz und schließen Sie es dann wieder an.

Natürlich gibt es keine absolute Gewissheit, dass das Problem bei der Sonos liegt; es könnte genauso gut an dem Gerät liegen, das am Line-In-Eingang angeschlossen ist. Haben Sie dieses Gerät bereits überprüft?