Hissing noise from speakers


i noticed odd hissing sound coming 4s's speakers, both headphones , without. occurs @ high or max volume. can make sound if pause video/song, put volume on highest setting, , un-pausing , re-pausing video/song. hiss goes away when lower volume or phone makes other noise. else notice this?

what's more odd it; synced older ipod touch 2g itunes , same exact thing (i don't know if did before). tried restoring both of them factory settings , noise still persists under mentioned circumstances.

maybe "feature"? can't hardware because happens on both devices, , don't think it's firmware issue because still occurs after factory restore.

please try mentioned earlier "i can make sound if pause video/song, put volume on highest setting, , un-pausing , re-pausing video/song." , tell me if hear hiss well. if not, should repaired. thanks!
 



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