Upgrade with best price/performance ratio


Just wondering what was your upgrade with the best price/performance ration in your audio journey ... like upgrading an IC, preamp etc ...

Let me start:

-Corian pieces leftover from kitchen upgrade project

out of boredom I used the Corian chopping boards and put them in between the shelf's MDF board and BDR cones. The effect was a big surprise ...

- much quieter background, solid bass and cleaned up mid and treble.
kschiu
Yes, speaker positioning and appropriate connection to floor - very high on the price/performance list (very low p:p ratio). I also felt replacing all fuses in my amp with HiFi Tuning silver fuses and adding aftermarket PC to my CDP provided big performance boosts for not tremendous amount of money, but both were well over $100 so a higher price/performance ratio compared to those I listed above.
Furutech fuses make a surprising difference for the small investment whcih they require.
(disclaimer: I am a dealer)

Jim Smith's book Get Better Sound for $25 or $30 is great also. i do not sell that though :-)
Room treatments. Nothing can sound right in a bad room.

Ferrite snap-on core noise filter. About $2 each. Put one on each end of all
digital cables and power cables saved me from buying audiophile brand cables.

Replace batteries in my Vandy 5 crossovers. It is not really an upgrade, more like
a maintenance but the effect is really day and night.
My Machina Dynamica (Modified) Clever Little Clocks with two P.W.B. Electronics Memory Foils on each battery!.. foil@belt.demon.co.uk
Hello Buff : I read your post on Audiogon re the Furutech fuses. What were the differences you heard and in what kind of equipment ? Have you compared Furutech to other high end fuses? If so, what are your impressions ? Thanks tubey / Vasil