We have an ARC Ultra installed along with a SUB and AMP. The ARC, every now and then, lowers its volume by itself to 15. We don't have a control system, just the TV. Has anyone seen this before?
Question
ARC Ultra lowering its volume
How is AMP used? Surround? Another Room? What speakers are connected to AMP?
Is it a permanent drop, or does it return to your original setting? I’m wondering if you have a voice command module, that might be falsely recognizing a ‘wake’ word.
I’d be tempted to submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, Sonos’ lawyers get sensitive about GDPR, I suspect. They should be able to see where the volume drop command is coming from.
There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.
When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
If your Amp is bonded to the Arc as surrounds, the next time it happens, check the front LED on the Amp. If the LED is flashing orange, then white, the Amp is in a fault state and is automatically turning the volume down to prevent damage.
There are a few reasons why an amp fault can occur:
- The speaker wires are not properly plugged in or are touching each other.
- The speaker wires are damaged.
- The Amp is overheating due to inadequate airflow. This can happen if other devices are stacked on top of the Amp or if the Amp is in an enclosed space.
- There’s too much of a load on the amplifier. Make sure your speakers have an impedance rating between 4 and 8 ohms. If you have 4 ohm speakers, you can connect one pair to the Amp. If you have 8 ohm speakers, you can connect two pairs in parallel.
- There’s a problem with the speakers themselves.
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