I think George Marino and Ted Jensen at Sterling sound did some great 24 but redbook remasters. With a couple of exceptions all the HDCD's I've seen are from 1999-2002 during their hay day but the format never really took off. Not aware of any that got remastered. I have a high end SACD player and many discs. I think the original single layer discs might have been the best sonically and quite expensive if you can find them. They were mfg from 1999 thru about 2003 then the hybrid two layer discs came out. No old SACD player I've found would read the embedded SACD player. I'm also not aware of any SACD disc's that got remastered they are one bit to start with. If someone knows something I don't please share specifics I'd be all about it
Remastered CDs, HDCDs, SACDs
CD is my only source. My album collection is somewhere around 800 discs. I have found significant differences in SQ (sound quality) comparing original releases to remastered releases. To my ear, Bob Ludwig was the best engineer for that.
I was speaking with a local recording engineer and mentioned how much I liked Bob's work. He replied Bob boosted 2 dB at 150 Hz.
In order of SQ (worst to best) my rankings are original CD, original HDCD, remastered CD, remastered HDCD, original SACD, remastered SACD.
Those rankings are usually the case, though occasionally they may vary.
Happy listening to all. Enjoy the music!