Hi @RHJ 

Welcome to the Sonos Community!

This does not sound like normal behaviour to me - please reboot the Arc by removing power for a few seconds and test again.

Please also note that the exact placement of Subs can significantly affect how much you are able to hear it, so please experiment a little with Sub placement - even moving one a few inches can affect things drastically.

It may also help to remove the Subs from the Arc and bond them together once more: Settings » System » mroom with Arc] » Remove Sub(s).

If none of this helps, however, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.

Myself and others have said the volume is now lower than before. Don’t know why they call it performance enhancements when they turn the volume down on its users. 

Hi Sonos and Dogdad

I have now spoken to Sonos support and they have rectified the issue by restarting the whole system again and starting from the beginning. This has made a huge difference and the sound is now back as it should be. 
 

thank you Sonos for your great customer support. Would now turn my one start to five star as the sound is amazing with two subs. 

Hi @RHJ 

That’s great to hear - thanks for updating the thread!