Windows 7 Trouble with A2DP on Windows 7: MW600 Headset Sound Quality Issues

It seems like you are facing an issue with the A2DP (Advanced Audio Distribution Profile) on Windows 7, specifically related to your MW600 headset where you are not getting stereo audio output. Here are some steps you can follow to troubleshoot and potentially resolve the issue: 1. Check Bluetooth Drivers: - Ensure that your Bluetooth drivers are up to date. Outdated drivers can sometimes cause connectivity and audio quality issues. 2. Disable Hands-Free Audio: - The issue you mentioned about seeing "Hands-Free Audio" instead of "Stereo Audio" in the playback devices might be related to the problem. This usually indicates that the headset is using the hands-free profile instead of the stereo profile. Try the following: - Right-click on the volume icon in the system tray and select "Playback devices." - Right-click on the device that represents your headset and select "Properties." - Go to the "Services" tab and uncheck the "Hands-Free Telephony" option if it's checked. 3. Set Default Audio Device: - Make sure that the MW600 headset is set as the default audio device for playback. - Right-click on the volume icon in the system tray and select "Playback devices." - Right-click on the MW600 headset and choose "Set as Default Device." 4. Restart Audio Services: - Sometimes restarting the Windows Audio service can help resolve audio playback issues. - Press Win + R, type services.msc, and press Enter. - Locate "Windows Audio" and "Windows Audio Endpoint Builder" services, right-click on each service, and select "Restart." 5. Reconnect the Headset: - Try disconnecting and reconnecting the MW600 headset to see if the issue persists. 6. Test with Another Device: - If the issue continues, try connecting the MW600 headset to another Windows 7 device to see if the problem is specific to your computer. 7. Check Manufacturer's Support: - Visit the Sony support website for the MW600 headset to see if there are any specific driver updates or troubleshooting steps recommended for Windows 7. By following these steps, you should be able to troubleshoot the issue with the sound quality and A2DP profile mismatch on Windows 7.