After update MacOS Tahoe my external speaker right side is not work, Please help me to fix.

—check your sound setting to make sure Balance did not get thrown off.

Audio Midi Setup.App

—Plug in external speakers/ head phones and compare your results; come back to your internal(?)

—Shutting down and restarting more than once after a major upgrade is always recommended.

<external speaker right side is not work>

miss read this as internal, same procedure however with your externals —Make some changes !

What ever third party external device you are using search the developers website if in doubt(?)

Support/Help/FAQ/Known issues/compatibility/updates…

If you have any antivirus software installed, then remove it A.S.A.P. as they interfere with the system operations and performance.

If you don’t have anything like that installed, then try the following:

First, let’s see if this issue happens in Safe Mode:

1. Shut down your Mac.
2. Press and hold the power button on your Mac. As you continue to hold the power button, your Mac turns on and loads startup options. When you see Options, release the power button.
3. Select your startup disk. It's named Macintosh HD, unless you changed its name.
4. Press and hold the Shift key, then click the “Continue in Safe Mode” button below your startup disk.
5. Log in to your Mac. You might be asked to log in again.

If the strange behaviors do not occur, then it may possibly be a software issue.

If the issue doesn't continue in safe mode:

Leave safe mode by restarting your Mac normally, then try to reproduce the issue.

If the issue doesn't return, it might have been resolved by the other things that safe mode did at startup, such as checking your disk and clearing caches.

If the problem persists, then let’s try this:

• Software Update.
• Use Apple Diagnostics to test your Mac.

Need more help?

• Call 1-800-APLCARE.
• Contact Support.
• Mac Support.
• Mac User Guide.

Good luck! 👋🏼😉