You planning on wall mounting?
How have you got them connected to the TV? I've got my Z5500's connected to my DVD player/freeview via Coax, 10 meter coax, but the 1 meter sounded the same, and on like TV channels the sound is all muffled and crap bass, but I switch to the radio stations and it's fine , DVD Player is what has the coax, then I connect freeview to the DVD via scart.
Nah we're moving house soon so no point, the XBox is connected by optical, we don't use the TV for TV watching so it isn't connected.