[
    {
        "role": "user",
        "content": "i%20have%20a%20sonos%20system%20with%20all%20software%20and%20firmware%20up%20to%20date.%20in%20one%20room%2C%20i%20have%20a%20a%20stereo%20pair%20of%20ERA%20300%20speakers.%20music%20is%20only%20coming%20out%20of%20the%20left%20speaker.%20both%20are%20getting%20power.%20previously%20i%20would%20get%20music%20out%20of%20both."
    },
    {
        "role": "assistant",
        "content": "If your Sonos Era 300 stereo pair used to play from both speakers but now only the left one is active, there are a number of troubleshooting steps you can take. Here are the most likely causes and how to fix them:\n\n---\n\n### \ud83d\udd0d What to Check First\n\nBefore digging deeper, verify:\n\n- The speakers are still bonded together as a **stereo pair** in the Sonos app. If they\u2019ve been unpaired (or one of them dropped off the network), you'll get audio only from one speaker.  \n- Both speakers are updated to the same firmware version. Discrepancies in software often cause pairing issues or missing channels.  \n- Wi-Fi network is stable and both speakers are getting a strong connection (signal strength can matter).  \n\n---\n\n### \u26a0\ufe0f Possible Causes & Fixes\n\nHere are several potential causes for the issue and steps to resolve them:\n\n1. **Stereo Pair Has Unlinked**  \n   If the stereo pair has accidentally broken, the left speaker might still be active alone.  \n   *Fix:*  \n   - Open the Sonos app \u2192 **Settings** \u2192 **System** \u2192 **Products**.  \n   - You should see both Era 300s listed under one room. If not, there should be an option to **Set Up Stereo Pair** again. ([support.sonos.com](https://support.sonos.com/article/create-a-stereo-pair?utm_source=openai))  \n\n2. **Difference in Firmware**  \n   If one speaker still lags behind on an update, they may stop working properly together.  \n   *Fix:*  \n   - In the Sonos app, go to **Settings \u2192 System \u2192 System Updates** and ensure updates are applied equally to both.  \n\n3. **Hardware or Connectivity Problem**  \n   Perhaps one speaker is receiving power but not communicating properly with the network or stereo pair.  \n   *Fix:*  \n   - Power cycle both speakers (unplug, wait ~30 seconds, plug back in).  \n   - If that fails, perform a factory reset on the non-working speaker and add it back to the system.  \n\n4. **Change in Usage Mode (Stereo vs Surround)**  \n   If the speakers have been switched to act as **surrounds** for a soundbar rather than a stereo pair, Sonos changes how audio is sent to them\u2014some drivers might be disabled. This can cause audio from only one speaker to be noticeable or expected. ([en.community.sonos.com](https://en.community.sonos.com/home-theater-228993/only-two-of-the-four-side-firing-speakers-of-era-300-are-playing-when-used-as-surrounds-with-beam-gen-2-6928292?utm_source=openai))  \n\n5. **Bluetooth or Line-In Input Issue**  \n   If you're using Bluetooth or a line-in on one speaker rather than streaming via Wi-Fi, the behavior might differ. Even in a stereo pair, if the source is only connected to one speaker, you need to check that settings allow both to play. Sonos supports Bluetooth on one speaker of the pair and should send audio to both if they\u2019re paired. ([digitaltrends.com](https://www.digitaltrends.com/home-theater/sonos-era-100-era-300-bluetooth-explained/?utm_source=openai))  \n\n---\n\n### \ud83d\udee0 Step-by-Step Fix List\n\nHere\u2019s a prioritized list of steps to try:\n\n1. Confirm in the app whether the Era 300s are still set up as a stereo pair.  \n2. Check under **Settings \u2192 System \u2192 Products** that both speakers are listed under one room.  \n3. Check for system updates; update both if needed.  \n4. Power cycle both speakers.  \n5. If still broken, factory reset one unit and add it back.  \n6. If used as surrounds, check whether surround mode has disabled certain drivers causing one speaker to be silent.  \n\n---\n\nIf you try these and it\u2019s still just the left speaker working, let me know what you've observed\u2014like whether the right speaker shows up in the app, whether you're using Bluetooth or Wi-Fi, etc. I can help narrow it further or guide you into contacting Sonos support."
    }
]