IPad Loudspeaker hiss when using an app with sound. Is this normal?

Is it normal when an app that uses sound is launched (even the keyboard causes it) a very faint hiss sound is emitted from the iPad speaker? It is not constant either, only occurs when it's about to make a sound and for 5-6 seconds afterwards.
It is not loud, only fairly faint and can only be heard when the room is silent or you place your ear near the speaker.
Is this normal?

Hi,
Yes it's only minor and I have tried resetting which has no effect.
For example, when I open up mail or safari and then the keyboard pop's up it has a faint hiss from the speaker which then disappears after 5 seconds until I press a key of which then triggers it to reappear. It sounds like the audio amplifier running the internal speaker has some hiss and to save battery life it turns the speaker off when it isn't needed (hence why it disappears after 4-5 seconds).
It is only noticeable in a very quiet room and I guess it doesn't help that I have fantastic hearing.
I guess it's no big problem and it doesn't happen when I use headphones but it's just something I'd like to check in case it's the sign of a fault.
Thank you for your response red555, much appreciated.

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IPad Loudspeaker hiss when using an app with sound. Is this normal?

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