I know this isn't the best place to ask this question, but today I noticed that my speakers have a buzz/hum sound coming from them. The speakers I have are the Logitech X-240 with a subwoofer. The speakers are hooked up to the subwoofer, which is hooked up to a sound base that is connected to my MacBook. The hum sound is loud and annoying and I was wondering if anybody knew how I could get rid of it. Thanks.