Ever noticed a cylindrical bulge on USB cables? It's a ferrite bead, designed to dampen high frequency radio noise. Michael Simon of Mac|Life finds that they help cut GSM babble, too, preventing his desktop speakers making those weird buzzing noises when he leaves his cell phone next to them.
It’s really quite simple. Take a pair of scissors and cut off the end of the USB cable. Pop open the ferrite case and slide the bead off. Then, all you need to do us attach the bead to the end of your speaker cable, where it meets the speaker. If you cannot fit the connector through the pre-drilled hole (I couldn’t), simply tape it to the wire with a measure of electrical tape.
Or maybe just buy one for a buck.
iPhone Buzz Kill [Mac Life]