So, test out your phone. Play any audio on your phone, put your ear close to the front speakers and listen for any crackling or popping once the audio is done.
On a similar note: Those who got the latest OTA update of 1.29, has the update fixed this issue?
I know there's threads regarding this issue, but I want to see just how many HTC One owners are experiencing this issue exactly. Whenever you play any audio on the HTC One, there tends to be a popping sound after the audio is done, approximately 2 seconds after. It's noticeable in a quiet environment, and also whenever watching YouTube videos the audio cracks.