Android speaker crackling/popping noise survey
I've recently bought a Zenfone 2 and I've noticed that the lower speaker emits crackling and popping noises when and after having played a sound, think about at the sounds of an old record player.
These noise are perceptible only when the environment is quiet but they are rather annoying as I can hear them every time I click on a ui element as touch sounds is on.
I've googled to see if this happened to other people and I've noticed that it was: many users with different devices, from the Nexus S to the Motorola Droid and with different Android versions from the 1.5 to the 5 had it.
A this point I don't know if it's "normal" to have it or not, espcially considering that hearing gets worse as the time passes.