What’s your vote for the most ridiculous, overpriced, and useless tweak?

@mahgister, good for you that you have found some useful tweaks. I can't recall a single tweak that came up from the user community that has been universally accepted by the industry - although spiking and isolation got close. 

 However, in any case this is a thread for discussing useless costly or ridiculous ones. Some would say that going beyond 4 track recording tape was a useless tweak if you were looking to improve sound quality. 

The devil is in the details you know. 

https://en.m.wikipedia.org/wiki/Reel-to-reel_audio_tape_recording

No sellers never said to me, to tweak my room, and that I must tweak the table where I put the costltly amplifier to isolate it from vibrations, and tweaking the electrical grid of my house, nobody who sells speakers of high quality like the Mission I own say to me that they will sound better with tweaked cable, and tweakes drivers, etc....

Useless, costly, ridiculous tweaks are 3 different things.... Equating the 3 only invite useless sarcasms …And to know for sure that a tweak is useless you must try it before with a sensible good and already tweaked audio system in a treated room... Costly is a relative notion that is impossible in many case to qualify objectively...Ridiculous tweaks is an interesting question to speak about yes, but only if we dont equate ridiculous with useless...For example my stones tweaks are ridiculous for many but are they useless? I know the answer, you dont… I wish with all my consideration the best to you...

Link please for Schumann frequency generator. The ones on eBay? 

Geoff this one is not usb powered then bigger than the usb one...I just ordered another one for me... I will own 2 usb powered and 2 bigger one with supply... That will makes a difference at low cost...I tweaked them with a short antenna perpendicular to the printed antenna and with crystals and stones...Results are almost astounding... I thank you for your Saucers for windows that works and is very simple indeed...

https://www.ebay.ca/itm/2018-FM783-Schumann-wave-7-83HZ-Ultra-low-Frequency-Pulse-Generator/18350108...

That’s the one I will probably buy. Does the black wall adaptor come with the device? By the way, the long spiral thing is the antenna.