you mean the freq response from the DAC? That's never been published by Pioneer. It would have to come directly from the DAC chip mfg. I know the DAC's in my own SC-09
but not the brand or model in the 57. Maybe someone knows that and can help you.
The only time I've ever seen published info from a CE company on how the different filters, in general, effected response is a white paper Sony published on their 1st hi-tech/hi-end SACD player, the SCD-1, which had 6 selectable filters. By the time their XA9000ES player came out, they had reduced the number to 2 and didn't publish any details on specifics, just the usual lingo-speak in the manual.
Also, the Wolfson 8741 & 8740 DAC's in some of Pioneer's earlier SC models, like mine, had 6 filters, but Wolfson never published any details even on the DAC spec sheet & engineering manual for the chip. And Pioneer never implemented being able to select them anyway.
Pioneer has never put out those details, AFAIK, not even in their service manuals nor even in their pre-Blu-ray universal players that had 3 filters you could choose from.
Good luck....maybe you'll get lucky and find something
I would start by finding out which DAC is in the 57 then go to that company's web site for engr details.
Besides, the actual in-room response & phase changes across the freq band is going to vary from setup to setup anyway, so how could Pioneer publish anything? MCACC also drastically changes response & phase so what comes out of the DAC is a moot point
There are subtle differences from changing filters, but they are very subtle
IME with the Sony XA9000ES and Pioneer 59AVi players both having selectable filters, you have to be a VERY serious music listener to pick out the differences. I can with the Sony player (1 sounds a tad smoother and deeper, less flat - to me) but only after extensive a/b comparisons. Casual listening & movies - forget it - it makes no significant difference.Edited by ss9001 - 6/8/12 at 8:34am