I have Motion 40's for L+R, Motion 30 center, Motion 4's for surround and Helos 12's for surround back. My Marantz receiver only has 7 channels. I think I know the answer to this, but do I need to have a 9 channel receiver to connect the height channel speakers? If so, is the sound significantly better and worth buying a new receiver just for the height channels? I watch movies and play video games; I don't use the system for music as much.