Biggest Sonic Improvement

Great question, however, I suggest modifying it to biggest sonic improvement per cost. Costliest: Switch from Dual 1241/Shure V15 to Linn LP12/Ittok/Troika turntable. I discovered information (detail) on very familiar recordings I never knew was there! Cheapest: Vibrapods under Linn Tukan speakers. Tighten bass, opened up soundstage and pace. Not bad for $6 ea.

Replacing an audioquest digital pro cable with illuminati D60, synergistic research master couplers, and a Meridian 200 transport replacing a Rotel 855.

When I hooked up a 2 dollar yard sale B.S.R.turntable that had a dirty old Shure cartridge on it.I had to super glue the cantilever on it as it was flopping around.The first second I knew my Digital days were over.Beat the HELL out of my old Denon DCM 440 0r 460 (forgot model #) I havent looked back since and now have a Rega-25 and Grado woody.ANALOG!!!!!!!

A phono step device/and cartridge from my mass market Sony tt and (yes) into a reciever's phono input.The step up & cartridge were bought used.the brand?? The still highly rgarded Fidelity Research.I played records,non stop till I dropped.That was 21 years ago.I have spent tons of dough,re,& re discovering what else was in those gruves.that was the biggest-for -the least

A phono step device/and cartridge for my mass market Sony tt and (yes) into a reciever's phono input.The step up & cartridge were bought used.the brand?? The still highly regarded Fidelity Research.I played records,non stop till I dropped.That was 21 years ago.I have spent tons of dough,re,& re discovering what else was in those gruves.that was the biggest-for -the least.Kids,and DIY ers,proper alignment is the key.Pay to have it done well.