The wire antena which came with the system (and instructions were to extend the wire for its entire length) causes a hum. If I turn the interphase that connects to the system, or move the wire itself, it increases or decreases the hum, but will not kill it. Has anyone else experienced that? I'd appreciate any tips; thanks very much.

Audio Players & Recorders - Nakamichi - SoundSpace 5 Shelf System