Burson Audio low level noise

I have a 160D has any one else experienced a low level hum/electronic hash noise? I can hear it about a foot or two away from the speaker. Is it normal in general to not have perfect silence?
It sounds like a ground hum issue to me. I previously owned a Burson 160D that gave me a slight 60hz hum when hooked to my amp. I ended up having to ground the 160D to my amp using a lightweight piece of wire. Wrap the wire around a chassis screw on your amp and the Burson to see if that does the trick. Best of luck!