@Guidocorona: One reason I've waited 6 months is because I've been diligent about burning in and trying the different filters and combinations on the K-01. While there is a marked difference between them, I still haven't found one that can match the Reimyo for warmth, richness, and musicality. It may be because the Reimyo did 8x oversampling while the K-01 is capped at 4x, and it does seem generally true that oversampling adds a sense of richness to the music. I think I found the FIR filter slightly richer, tonally, than the SDLY, but the SDLY was more natural sounding.
@Others: Thanks for the suggestions. I'll look into them.
@Others: Thanks for the suggestions. I'll look into them.