30k tracks downloaded to my phone in opus format - basically my whole library. I only play downloaded music via ARC.
I play music directly connected to my car stereo or via airplay to my chord poly/mojo2 with my iPhone connected to the chord poly hot spot.
In the car my phone sometimes gets too hot to continue charging.
When mobile my phone also gets hot - and the battery life is much shorter than when not using arc.
Describe your network setup
Amplify alien router and 3 mesh points, unmanaged ethernet switch connected to one of the mesh points with my roon server and multiple ropieee raspberry Pis connected to it by wired Ethernet. BT broadband with single NAT
Thank you for writing in to report this issue. We recognize you’ve encountered this symptom for some time, but additional logging we’ve added to capture thermal status from the operating system hasn’t appeared in recent sessions. It’s likely we haven’t captured the event you’ve described in diagnostics needs.
We’re going to first need to identify whether connecting to the hotspot on the Chord Poly is a factor in this report. Please test whether you can reproduce the hot phone under the following conditions:
Connect directly to Carplay via USB-C or use the System Output (phone speakers).
Disable any MUSE profiles you’re using
Play back OPUS content
Then repeat the test while connected to the Chord Poly hotspot instead. Do you reproduce identical thermal conditions on the phone in each test?
If you can provide an approximate timestamp of when you try the above, we’ll eagerly investigate further.
So I did almost as you asked this afternoon - I can re-do if the differences matter.
14:00-15:00 I played an ARC Opus local playlist to the iPhone Output, I turned off my MUSE processing (at least most - I may have left headroom adjustment on)
My phone stayed pretty cool.
15:00-16:00 I played the same to the Mojo/Poly via airplay - with the same MUSE settings
My phone was much warmer
16:10-16:50 Played the same playlist to the Mojo/Poly but I I turned on my normal EQ - and crossfeed (I don’t normally use this).
My phone was warm - not clear if MUSE made it warmer still - perhaps.
Just guessing a bit here, from some experience. Using AirPlay to stream music will employ the WiFi antenna and use quite a bit more power. And the more competition/interference/distance involved in your WiFi connection - which is constant when streaming AirPlay - the more power will be required, which will create more heat…
Thanks for the additional info! Did you by chance use smart downloads during any of the above events? If you completely disable this feature, do you still run into the same issue?
Apologies if I’ve glazed over this, but does the issue occur if you don’t use the Mojo device? I hope to have more information from our team to share soon.
Thanks for the reply. For additional clarity - are you keeping ARC foregrounded when this occurs? If not, even if it’s backgrounded, do you leave Arc on the Now Playing or Queue screen when the issue occurs?
When walking or travelling by public transport I often use a navigation app, so it’s probably a bit random which is in the foreground, although I usually lock the screen and put my phone in a packet.
In the car I also often use a navigation app, this will usually be in the foreground with the screen unlocked.
Thanks for the report! We’ve found that there can be higher GPU usage in the foreground when using the Now Playing and Queue screen - our team is actively working on incremental improvements in this area that I’m confident will help your case.
As a next step in testing, can you try backgrounding the app, leaving it on a different screen than Now Playing / Queue, locking the phone, and seeing if it changes the behavior?
Either way, we have a ticket in for this issue that I’m confident will help you.
Just to say that I can still reproduce the “Charging on hold “ hot phone message with both airplay and usb connections even with ARC not on the queue / now playing screens.
It may just been the same root cause, but with additional heat caused by the charging process.
Still feel there might be some other aspect of what’s happening that I haven’t got to the bottom of yet!
