[Q] speakerphone buzz: during outgoing dial tone - One (M7) Q&A, Help & Troubleshooting

My top speaker is buzzing when dialling an outgoing call on speaker but all other tones even music and Listening to thé récipient on speakerphone are fine at fine at full volume which is strange so i thought its maybe only à particular frequency of sound causes thé buzz but to no avail.
I even tested a whole range of sound frequency but still no buzz. Why is it happening, anyone else's do this?
Here's what I tested with:
https://www.youtube.com/watch?v=nklzAUrXSuM&feature=youtube_gdata_player

Anyone ?

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