Not only do cables make a difference, dep14, but with the right ones the difference is enough that cables are EQUALLY as important as any other component.
Two great stumbling blocks stand in the way of realizing this.
The first is thinking measurement has anything to do with it. Forget audio for a minute. Look at it this way. Mercedes spends many millions every year on their Formula One team. F1 cars today are festooned with sensors collecting real-time data like you would never believe. Seriously. I mean it is freaking amazing. Millions of dollars just on that one little bit of it alone. They know where that car is and what forces are acting on it, millisecond by millisecond. Yet when they want to know how to make it faster, what do they do? They ask Lewis. They talk to Valtteri. Because they know when it comes to processing complex data nothing beats a human being.
One more thing about measurements. Let’s say you listen to one cable and it sounds a whole lot better. What are you gonna do? Deny the reality of your own senses until you see your own experience validated on an oscilloscope trace? Really? I would hate to be your wife. Yes honey you felt good last night but I really need to get the doctor in there to confirm it with an ultrasound or something. Exactly how much sense it makes to go looking for numbers to validate one cable sounding better than another.
The other big stumbling block is the tiny amount of really good cables relative to the vast selection of stuff that sounds different but really isn’t comprehensively better. Its easy to do like you did and find something better than the crap they ship in the box. Its a lot harder to find the really good stuff, cables that make your jaw drop at how they manage to make a bigger difference than even your amp or source component.
But they are out there. The most comprehensively excellent across the board one that I know of is Synergistic Research. Their AC Master Coupler is a Gold Standard of entry-level excellence. You can pick one up for $150, or less.
https://www.usedcable.com/synergistic-research-ac-master-coupler-non-active-right-angle-iec-5ft-1-5m...Plug this into ANY of your components and prepare to be amazed at the awesome difference quality cables can make.