I’ve already contacted SONOS and Denon tech support on this one. It’s odd to say the least.

History: I bought a single SONOS Roam 2 to test via bluetooth with my Denon AVR 760H. It worked after I got help from Denon (Did a POWER RESET, and a NETWORK RESET). Bluetooth connected just fine and it sounded nice. It even worked nice with my iPhone. During the setup of the SONOS Roam 2, I was never prompted for a number on the bottom of the speaker.

Based on the aforementioned test results, I ordered a second SONOS Roam 2. When I received it, I plugged it in to set it up. During the setup, I was prompted for the number on the bottom of the speaker. This was new to me because the first one didn’t ask. Also during the setup, the speaker did a firmware update. I tested it alone via my iPhone, and it worked perfectly.

I plugged the first Roam 2 I bought back in, and it did a firmware update. It also asked me for the number on the bottom of the speaker this time. I found this odd. I reprogrammed the speaker and gave it a different name from the other. I then paired the speakers. I tested using my iPhone, and they sounded great.

Then I tried connecting the speakers to my Denon 760H. I was able to connect to the pair, but all I get is a very low volume of skipping audio from the SONOS Roam 2 speakers. The wired speakers work fine. All of the testing is done via using Pandora. The Denon app uses the HEOS app to control the streaming audio choices. I always use Pandora.

• I turned off the wired speakers. No difference.
• I unpaired the speakers and tried each one individually. No difference.
• I tried connecting the Denon to a bluetooth Panasonic speaker. It worked fine.
• I performed a factory reset on each speaker, re-setup each, and tried individually. No difference.
• I re-paired them and tested. No difference.
• I did a POWER reset on the Denon by holding the POWER button in for 10 seconds. This is what helped me the first time I contacted Denon. No difference.
• I did a NETWORK RESET on the Denon, reprogrammed the network settings. No difference.
• I did a NETWORK RESET, the a POWER reset, then reprogrammed the network settings and the bluetooth settings. No difference.
• I unplugged the Denon and waited one minute after doing a NETWORK RESET. Then reprogrammed the NETWORK settings and the bluetooth settings. No difference.
• I even did a complete power reset on my networking hardware. No difference.

Both SONOS and Denon are at a loss of what the problem is. I asked the SONOS tech if the speaker firmware update did anything to the bluetooth feature. He said he believes it was only an app update. I told him that I respectfully disagree because each speaker got the update. If it was the app, the iPhone would not update the app twice (in my opinion). He also stated that it appears that there’s an incompatibility between how SONOS and Denon use bluetooth. Odd that it worked earlier!

So a quick recap:

• iPhone and paired SONSO Roam 2 speakers work fine.
• Denon to Panasonic bluetooth speaker works fine.
• Denon to SONOS Roam 2 speakers only results in a low volume skipping audio stream.
• Everything is on the same wifi network.
• The only thing that changed was the firmware in the speakers.
• Each vendor suggested contacting the other. I can’t really blame them.

If anyone has any ideas on what to check next, I greatly appreciate it. I have $400 worth of SONOS Roam 2 bluetooth speakers that do not meet their intended use need.

Thank you!

Joe