I switched RCA analog interconnects on my FM tuner and couldn't believe the difference from inexpensive Acoustic Research cables ($15 or so) to some entry level Audioquests ($35 or so). Not night and day, but noticeable. Same when I de-soldered the horrid RCA's on a Project turntable and installed gold plated female RCA jacks and ran some other entry level Audioquests. Not night and day, but noticeable and no hum! I frankly can't hear any difference with digital cable upgrades.
Where do cables upgrades have the most impact?
Assuming all existing cables in a system are atleast mid-grade (not junk), which cables/interconnects should be upgrade first and in what order? Where should one start?