You are probably not going to find a pre/pro that does the new audio formats for $500, new or used. You might find a receiver used such as an Onkyo or Denon for that price but even those are not that readily available because they just have not been out that long.
The biggest advantage would be that a pre/pro will cost less than a receiver of the same quality. Unfortunately starting price is about $1600 for a pre/pro such as an Integra dct 9.8.
The biggest advantage would be that a pre/pro will cost less than a receiver of the same quality. Unfortunately starting price is about $1600 for a pre/pro such as an Integra dct 9.8.