@papafrgog --you bring up great points that I have questioned in the past to no avail. It is interesting that when a new model comes out, the brand always tells you what has changed. ie better capacitors, resistors, wiring etc. It would be nice to know what is different about the purple or for that matter, what is the difference between a QSA Blue and Yellow.
I have a very high-end system with all high-end accessories/tweaks. At some point, there is a law of diminishing returns. So in my system, when I just added one fuse to my Lampizator Pacific, I really did not hear a notable difference. I will give you another example. Everyone raved about Townshend Audio Isolation Podiums. I purchased them for over $3k and I certainly did not get the results everyone bragged about. People proclaim every tweak matters. and that it is a cumulative effect. Well, I guess it depends on each person's system. Sometimes when you order a prime steak you don't put A-1 sauce on it. You just enjoy the prime steak.
My point is or IMO, if you have a great system you are not going to realize an incremental improvement with every tweak imaginable. I challenge those that disagree to go back and start over. Remove every tweak and listen to your music. Use that as your baseline. I did that. Then start adding one tweak at a time. See what really makes a difference. As I said, I have every tweak there is...lol. Some have not worked; others have. You might ask why am I continuing to add tweaks if my system is great. Because we are always looking for that extra bump in sound. In lower-end systems, I believe that tweaks can help more. The biggest improvement in my system came when I added the Lucas Audio LDMS Music Server. Better components DO matter
Tweaks that worked for me: Upgraded fuses, PPT paste, and mats, 1260 contact enhancer, acoustic absorption panels. Tweaks that are less than satisfying -Schuman's Resonator's, Townshend Podiums, Amplifier isolation pods. The jury is still out on HFT's and I have 18 of them.
What's next? I have had every SR fuse they have made and now QSA Yellow fuses. I am still reading this thread for Purple reviews and WBF for QSA reviews. I will contemplate trying one Purple or QSA red for my Lampi. If I hear improvement I will keep otherwise for sure I will return.
Let the debate roll on!