But , none of that can account for how the same system is capable of making some recordings sound absolutely wonderful and others sound like crap!?! With all things being the same within the system (as they currently are) the only variable has been the music and that is entirely the basis of my question in my original post. (FWIW - I only mentioned AMD products because I wanted to point out that I thought my system was sounding better than ever now: not to draw attention to the tweaks themselves, which I think sidetracked everyone from the point I was trying to get at.)
Warning, rant...
Good/great recordings sound dimensional and expansive on my system right now. They have good depth, a wonderfully wide soundstage. There's texture, detail and subtleties with air/space between voices and instruments. Complex passages and harmonies seem to present themselves in a layering of sound that just kind of draws you into the music.
Bad recordings have very few of the attributes I listed above for the good/great recordings. Bad recordings sound flat and congested. Soundstages on the bad recordings can be narrower, their overall range can seem compressed, everything musically seems to be "homogenized" into a nondescript musical blur. The overall presentation on what I am considering bad recordings sounds much smaller.
Everyone has that problem. Most old recordings have little of the spatial cues of modern audiophile recordings. They were meant to be played on single speaker, which was common for consumer playback until 1980 and beyond. Some of the spatial cues on older recordings would be better off in mono.
You pose the sound of old recordings as a problem. You said it started after recent tweaks. The solution would be simple, remove them, except that you are emotionally addicted to the feeling you get from the system in the new form. You are torn between choosing the feeling of music enjoyment from the old records and sound enjoyment from the new recordings with the tweaks.
Fortunately all audio tweaks do wear off as the brain seeks homeostasis from the increased dopamine that you are enjoying now from the stimulation of increased fidelity. When it does wear off and your system sounds "normal" again, then you have a choice. You may be able to tolerate the old recordings again after the craving for dopamine has subsided, and then you can be content enjoying musical content emotionally but without the mental stimulation of ear candy. Or you can decide you prefer the stimulation for an ongoing high without requiring your emotional musical involvement, in which case you have to find more tweaks to further reduce overall distortion. As the distortion level falls lower, the cost of tweaks to take it even further become more expensive. But they are always available and they will always work, because the system can never reach the resolution of the brain. And the brain gets better at hearing details with each new tweak, the sonic details become even more precious and stimulating. The recordings that contain that level of detail are harder to find, and the musical content may not be your preference.
Eventually you realize that the sonic details are mentally stimulating, but not fulfilling your heart like good music does. And the thrills are not worth the money anymore. Then you decide to find a cheaper stimulant, or dial back the resolution and seek emotional fulfillment from music. The only risk is that anything that raises dopamine can be addictive and the addiction may continue after the audio bubble bursts. Dopamine addiction is the driver of modern culture. Having it at the touch of a remote control button has made it too easy. It used to be you had to play, hunt or fight for sex to get dopamine. Now just drive thru starbucks or listen to G-105. It's everywhere. But the addictive nature of it requires greater and greater stimulation to maintain unnaturally high levels. No problem, Apple will come up with something. A broadband internet connected portable TV in your pocket? WTF? Who really needs that? Dopamine is "want."
What kind of system do you need (to emotionally interact with quality music) vs. want (to be mentally stimulated with ear candy and exaggerated dynamic range?)
I was done until i read Bob's response. Rant continues...
I went down the rabbit hole with my last system. Replacing every part of a very musically satisfying system in order to increase resolution to get a sound quality buzz. At some points, with borrowed gear added to mine, the resolution was extreme, dynamic range was way more than the room could handle. I found myself listening to music that I otherwise wouldn't listen to because that's what sounded good on the system. Sounded good? WTF? Fourplay and Chris Botti instead of Kenny Dorham? Something is wrong here. Fortunately I found enough things wrong with the Ushers that I could hang blame for my listening dissatisfaction on them. I sold them as quick as I could once I believed they were the problem. I couldn't identify a specific thing wrong with them, but I made up things in my head because somehow i knew that they were the root of the listening dissatisfaction. Like the importer bad mouthing them on avguide forum, or being made in China, or the lies about the bogosium drivers, none of that had anything to do with the sound of them, but I used those excuses to bail myself out of a painful situation. Actually they were awesome speakers, for an audiophile who loves sound quality more than musical interaction. But I could not get past the stimulating effect they had. They weren't meant for someone who does not want to be mentally stimulated by sound. They were not meant for music lovers. Now I know they had too much resolution for my needs. After they were gone I felt a huge relief. I couldn't understand why, because I mentally knew that I would never have speakers "that good" again. But I was relieved. It took a year to get unhooked from sound quality and start to listen to my old jazz recordings again. I first switched to in-ears for sound quality stimulation, but gradually that wore off too when I learned to recognize the missing musical satisfaction. I have no desire to increase resolution again. The Ushers taught me a valuable lesson about how much resolution I want and how much I can stand. The feastrexs had the right amount of resolution, but not flat FR. My Legacys had too little resolution. The only thing I have bought in 2 years that increases resolution is a set of interconnects, but I had auditioned those many times over 4 years and knew I loved them in every system. OK preview button, maybe done... YES End of Rant!
So cathartic! Thank you Bill!! Don't worry about it, it will work itself out in time. Just enjoy your nice recordings for now. Enjoy that feeling of being in love and winning the lottery, and taking coke, legally, at the touch of a button. WOW What a hobby!