@Simsational_CJ Each application can use a different combination of resources and program sounds in a slightly different way. So it's not uncommon for an issue to appear only in one game. Since this echo is an unusual problem and only rarely reported in Sims 4, it's not purely a game issue, although it's certainly possible that the game doesn't work well with a particular driver.
One other suggestion I have is disabling Windows Sonic if you currently have it enabled. Right-click on the volume icon in the lower-right corner of your screen and hover over Spatial sound to see the option. If you happen to see a different option enabled, please disable that too.
The only other suggestion I have is to open the sound settings, accessible through the same right-click menu, and mess with a few settings there. For example, click Sound Control Panel and make sure your preferred device is set as default, and if that doesn't help, change the default to something else you can test with. Under Manage sound devices, you can try disabling all but the one device you're using. And you can try the Troubleshoot button, although that doesn't always find existing issues.
After making any change, be sure to restart your computer before testing.