You have either a faulty cable or a faulty speaker. In budget-priced desktop speakers, the cables are often permanently attached to the speakers and can’t be easily or cheaply removed. Usually, the entire speaker system must be replaced. You might be able to replace the cables in a higher-end system. If that doesn’t fix the problem, the speaker may be blown out and must be replaced. Speakers at all price levels have a finite lifespan. If you’ve had a desktop speaker system for several years and there’s a lot of noise in playback, it’s probably time to shop for a new one. If a brand-new speaker is behaving badly, take advantage of the return policy or warranty and exchange or replace the unit.