@lak Fair question, tough to accurately answer. The modifications to the preamp and amplifier took place over years. The SACD mod. was once and done. The notes of the music were always there. What the modifications accomplished was providing a much more transparent sonic window to draw me into performances allowing for an emotional connection to those performances. Taking all of the mods into account, I would estimate a 25% overall improvement to the sonic satisfaction my system now provides. I'm sure that I paid more than that, but my previous post mentioned that I worked to minimize the law of diminishing returns, not eliminate it.
One last comment. There are those on A'gon who believe that everything we experience as we listen has some measurement attached to it. That is not experiential. There are so many intangibles involved in the listening experience. So what intangibles have I noticed the more improvements I make to my gear? I find myself on my laptop or reading at the beginning of many a listening session only to find myself putting that stuff down and even turning off the lights allowing me to become immersed in the music. At least for me, that's what all of this modding and tweaking over the years is about.
One last comment. There are those on A'gon who believe that everything we experience as we listen has some measurement attached to it. That is not experiential. There are so many intangibles involved in the listening experience. So what intangibles have I noticed the more improvements I make to my gear? I find myself on my laptop or reading at the beginning of many a listening session only to find myself putting that stuff down and even turning off the lights allowing me to become immersed in the music. At least for me, that's what all of this modding and tweaking over the years is about.