Hi all! I've got a quick question about my studio speakers. For about a week now, when I turn them on, the left speaker start making white noise after a few minutes. Even when the audio cable is unplugged. Sometimes it comes and goes (mostly comes). Does anyone know what I should look after first? It's about 2-3 inches from my left computer monitor, so I didn't think it could be a magnetic problem... but what do I know... I thought I'd ask just so I have a rough idea before taking it to a shop. Thanks IA!