the mods on this unit will shine via the 4x SPDIF output, that is where I would expect the ultimate in audio quality, I can't comment on jitter reduction circuits because I have never seen or heard them in action

Frank, Oppo units always have had pretty bad clock jitter, when doing SDI mods this has to be tamed and worked on before you get a stable SDI image (which uses the main 27mhz clock)

when working on high-end or modified players the clock signal is much more stable and cleaner and much easier to work with than these lower end players, thats why they need mods!!

thanks

-Gary Murrell
http://www.custom-ht.com/oppopowerbuy.html
My Personal HT setup