Right speaker has a zzzzzzzz sound

Your speaker might have a loose housing. To check this, try shaking the speaker up, down, and side to side gently and see if you hear any rattling. If you do, and you are good with opening things and electronics, then look at the speaker all around and see if you see any screws. If you do, then take them out and carefully separate the halves, front, or back (it depends on where the screws are). If you do not, then there should be a way you can pop the front protective cover off that protects the speaker from foreign objects. You should be able to look through the second protective cover (if there is one) and see the speaker. Try playing something and see if you can find the source of the rattling. If you can see a tear or all that you see is the speaker shaking when you hear the sound and you did not here rattling, then you may need a new set of speakers. If you can, try to tighten the housing.