i just picked up a cheap insignia surround sound receiver.i just want to hook up one speaker to go to my wife's side of the bed so she can hear and i can sleep.i'm just using charter cable with no box.there is no connection on the insigna for cable in.are these receivers only made to be used with cable or sat boxes? i tried going from the tv to the insignia but that didn't work. no hdmi conn either.i tried using computer speakers hoked up to the headphone output but the sound is bad.any ideas?