SR Tuning Discs, Psychoacoustic Bias and Listening Fatigue

I think many of the "night-and-day differences" are attributable to head position, mood, expectation bias, gullibility, nasal conditions, and a host of other issues not related to audio quality.  Companies like Synergistic Research, Furutech, Pangea, and others play on this and prey on the naivete and gullibility of audiophiles.  It's basically what the entire snake oil industry is built on.  

     No one can tell you whether/how your system, room and/or ears will respond to some new addition.   There are simply too many variables.

     LIKEWISE: no one can possibly know whether a new addition (ie: some kind of disc, crystal, fuse, interconnect, speaker cable, etc)  will make a difference, in their system and room, with their media and to their ears, without trying them for themselves.   

     Some companies offer a 30 Day Satisfaction Guarantee, so- those that are actually interested, have absolutely nothing to lose by trying (experimenting with) such.     

     Anyone that knows anything about the sciences, realizes that something like 96% of what makes up this universe, remains a mystery.       

     For centuries; humanity’s seen, heard, felt and otherwise witnessed phenomena that none of the best minds could fathom, UNTIL they developed a science or measurement that could explain it.     

     Theories have never proven or disproven anything.  It’s INVARIABLY testing and experimentation that proves or disproves theories/hypotheses.   

     IF you’re interested in the possibility of improving your system’s presentation, have a shred of confidence in your capacity for perceiving reality and trust your own senses: actually TRY whatever whets your aural appetite, or- piques the curiosity, FOR YOURSELF.         

                                             Happy listening!

Whether its snake oil, effective or just plain difference may be difficult to discern. Ultimately, I've come to the conclusion if it stays over the long term a positive difference is being heard. Been through plenty of tweaks over the decades, most come and go, this A/B over a long term, some stay, most have gone into unused tweak box.

If it works or doesn't work in your system does NOT mean it will work/not work in someone else's system. There are no absolutes in this hobby. I literally cringe when someone uses the term "Snake Oil". 

Buy it, try it, if you don't like it, return it.