Crackling sound Hi, i recently bought logitech z4 speakers which have worked perfectly for the first few weeks. However, i have moved them from university to my home and since then the speakers crackle quite frequently and slow the music down. Any suggestions whats wrong?

The crackling could be due to a faulty wire or jack connection. If you have any other sound device (e.g. headphones), try connecting that one instead of the Z4 and see whether the crackling disappears (in which case it's the Z4) or not (in which case it's the jack or the computer). Could arguably be an EM or electrical interference, but you'd need a laptop running on batteries to check the second, and trying orienting differently the speakers to try checking the first.

The music slowing down means something's wrong in the computer: the Z4 are purely passive, they can't do anything to the music tempo. Try running an antivirus check or try Task Manager (or Process Explorer) and see whether anything's eating more CPU than it should.