What speaker cable made a major difference in the sound quality of your speakers??

@edward506 (why does the @ only sometimes work?) - I totally get where you’re coming from. I was sceptical as well, read all the articles saying all that matters is resistance, maybe capacitance.. I bought blue jeans cables and didn’t even bother with power cables. Curiosity eventually got me to at least want to try messing around with cables. No way I was paying crazy cable prices though, so I chose to make my own cables.
My cables now are all DIY. I eventually realized that it was worth spending a little bit of money on the conductors and connectors and exploring different architectures.

Saying cables make a difference doesn’t mean I am advocating dumping tons of cash into a decent set.. there are other options.

Not sure on the "@".  I'm new to posting on the forums though I've been collecting listening to and ogling audio gear for over twenty years.  I appreciate that. Fair enough.  I'll do some more listening to various cables.  I still, so far, find the speakers and room acoustics to be the most critical.  But you only know what you know and can be surprised by what you don't.  

Edward- you are completely correct. Having components that play well together, well made speakers that the components can handle and acoustic treatment of the listening room all impact the sound of a system more than exotic cables will, as long as the basic cables are of sufficient gauge and quality. But once all the pieces are in place, cables can help bring out even better sound.

Don't forget or underestimate the connectors. In my present system, and all through it's iterations, Zu Event Mk I gave me the best sound. Getting them at a bit more than half price went a long ways as well. But the best sound I've gotten from them was when I had Zu swap out the spades for the bananas on the amp end. 

The connection may have not been the best because of the five way binding posts but it was the change of metal that elevated the sound.  Simply going from copper to rhodium over a berylium core gave me a couple orders of magnitude more detail, separation, clarity, and focus.

Even the bass was better resolved and more defined as well as a better front to back soundstage due to the more pinpoint imaging. It makes me wonder if I had some of my first cables terminated that way, would I have every looked for more.

All the best,
Nonoise