I consider "the rest" to be a refinement in speaker wire and interconnects. If you compare this to cleaning a window that you thought was clean, you will get the feel of where I'm coming from.
Some go by the name of the wire or interconnect, I prefer what % of silver or OFC copper and kind of strands. For example I like fine strands of heavy gage OFC copper for low frequencies, copper and silver for midrange; and silver for the high's. Interconnects should be copper silver composite since they must accommodate both extremes. I roll my own and use silver solder, this guarantees quality construction.