arc volume low

It may be the volume set by your TV. The Sonos Arc plays what it is handed, and when watching TV, it’s playing the volume set by the TV set. 

In fact every channel has a different broadcasting level. I watch some of them at 10% and others at 30%. Music between 15 to 50 depending of my mood 😬

Editing to add: check also your TV settings, perhaps it’s something not sending properly the sound to the bar. 

Thank you for the advice. I should provide more context. My theater room uses a screen and projector (all professionally installed and connected to my sources). Worked perfect last 5 years. Only recently have I noticed the significant decrease in the Arc volume when watching any programming (doesn’t matter if it’s streaming services or fiberop TV). The volume needs to be at a full 100% just to hear it decently (normally it would be at 30% to achieve same level). However when playing music the volume works perfect. I unplugged and did a factory reset on the arc. I’ve checked all levels in the settings, no “night mode” - nothing any different than when it was working fine. Thank you for any further advice you can offer.

In this case, you’re right, something is wrong. I suppose you play the music through a streaming service, while TV is sent by HDMI, right? Then the problem is in the HDMI channel, now you have to figure out in which side of the cable, the Arc or the projector. Or perhaps it’s the cable itself!

So, try with a different cable, try connecting the Arc to other TV or HDMI source and, finally, try other sound device with the projector. Without testing tools or knowledge I think it’s the only way to discover what is failing. 

I’d also reboot the TV and the Arc, by unplugging them from the wall for two minutes, then plugging them back in. I’d follow that by a check in their respective systems for any updates that need to be applied. 

Glad to hear that it was the cheapest solution 😅