@jhajeski...WHen I asked Keith Herron about that he told me that every aspect of the phonostage is improved. He didn't provide specifics. As for cost you should contact him about that, not me. I live 10 miles from him, so dropped my unit off at his place and picked it up again when he completed the work. He didn't have to deal with inbound and outbound shipping for me, so I'm pretty sure he factored that into my cost.