I have just switched from HTC to Samsung G S3, so i don't know if this is normal. while listening to music on the S3 it vibrates to the bass even though your listening through head phones and no sound is coming out of the phones speakers, has anyone else found this? The louder you put the volume the more it vibrates, its only to the bass or bass drum. Is this a feature to say its getting too loud for your ears or something?? I am not using the stock audio player, I am using Poweramp.