Hello, thank you for your feedback, based on which the supplier contacted us and would like to respond below.
"The glass is designed to be case-friendly, which means that its edges are aligned with the active part of the display so that it does not block the speaker. At the same time, the part of the glass that covers the speaker does not adhere to the display, to avoid distorting the sound. It is possible that this was a faulty unit. We would like to ask if you could contact us at our support email
[email protected], where we would be happy to resolve a potential claim with you by sending a new product."
Thank you and have a nice day, Ondřej - Alza expert