Chosen Solution

Just received an iPhone 8 Plus from work, but it sounds like I am in a tunnel when I talk to people. The “Smart”phone works fine on speaker and my AirPods. Any idea’s?? ( Also, there are two 6s’ doing the same thing at my company )

Replaced the Earpiece speaker and all was right as rain. Weirdest thing! iPhone 6s Earpiece Speaker

this might help https://www.youtube.com/watch?v=IGnpCsgG