Urite everyone, I've noticed that sometimes I get really bad low bass sounding feedback, like a really low 'hum' when playing tunes on me decks. I've tried moving my speakers as far away as possible and my hi-fi but I still get it. I've checked all the leads and the grounding cables and the all in securely. My setup is on a wooden table and I read somewhere that when it's on wood the wood vibrates and causes the feedback? I was just wondering if anyone else has had/has this problem and what they did to get rid of it. The only thing I've heard of is to put foam underneath but I don't know where to get foam from like? thanks.