Does the unit have to be grounded?

I have an iPod and an external Sirius receiver hooked up to it, and it seems that when they are both powered, I hear a slight humming noise. I know that there are a few wires that came attached to the unit, but I didn't do anything with them because there weren't any specific instructions on them. Any guidance would be very helpful.

Thanks

 

b.u.m.p.

 

No...the ground is taken care of since it is a plug and play unit. This is a characteristic (bad one) of the unit. Unfortunately (or fortunately), the only way to get rid of the noise is to turn off the device you are NOT using.

 

Thanks for the response.

What are the three wires coming out of the unit for then?

 

I believe two are remote turn-on leads