No Bass and Flat Sound in iPhone 16 Pro Earpiece Speaker

I want to reopen the discussion of one of the contributors (DariuszX) here, because I experience the same with two iPhone 16 Pro phones. His description that fully applies to me as well.

DariuszX(No Bass and Flat Sound in iPhone 16 Pro E… - Apple Community) wrote:

The earpiece speaker sounds flat, without bass, so voices during calls have no depth and sound less natural. Multimedia audio works fine, but the problem is noticeable during phone calls.

I sent the phone under warranty, and Apple replaced it with a brand-new device, but the issue remains exactly the same.

I’m not sure if it’s a software issue or a hardware problem, but I’ve tested the earpiece sound on the iPhone 15 Pro, 14 Pro, and 11 Pro, and those models sound much better. Their earpiece speakers are deep and rich, with clear low tones. The iPhone 16 Pro, however, has a flat sound. When I contacted Apple support, they told me to “get used to it,” which feels very disrespectful.

This feels like a poorly made product, but many people might not notice the issue because they don’t pay attention to sound details. As someone who works in music production, I can hear these problems clearly. In fact, even my old water-damaged iPhone 11 Pro sounds better than the iPhone 16 Pro during calls.The issue seems to be with sounds below 250Hz, which are important for giving voices a full and natural sound. Older models like the iPhone 11 Pro and 15 Pro handled this much better. This could be an issue with the speaker design or the way the sound is tuned in iOS itself for the iPhone 16 Pro.This is a serious problem. I ask everyone to check their phones and report this to Apple, or we’ll all end up stuck with a product that doesn’t meet the quality Apple is known for.