I have the Azden Pro wireless receiver which I attach to my speaker (Wildoats gave great inf. on hooking up a powerhorn)but here is the problem. The speaker hums when I play my Sony tapeplayer. I turn the volume almost off & it still hums. Hum,I wonder if there is anyone out there who has any suggestions which might help? Also would it hurt to paint the shiney telescoping rod on the receiver? I was thinking about just covering it with camo-mesh.