No one actually knows how to lculate what speaker cable they need

Anyone here actually tried using jumper cable wire as speaker cable......if so, how did it compare with other speaker cables you have used?

Yup. I bought this: https://www.ebay.co.uk/itm/5M-0-AWG-65mm-OVERSIZED-BLUE-POWER-CABLE-5-METRES-PURE-COPPER-0-GAUGE-OFC...
and had the guy cut and crimp spade connectors on to the ends. I then added bolt on bananas to the spades which work really well.

It improved the sound quality of my speakers (B&W 802N). Sounds are clearer and less congested. Continued listening and swapping back and forth reveals the same result. Others have said the same, including my wife.

For the £150 or so it cost me I would heartily recommend it.
I upgraded from Van Dam blue speaker cable.

I stopped posting on the thread as everything that's being said is just getting shouted down by a very vocal few who are apparently unwilling to believe that there could possibly be something in this. I've been called an idiot, told that my cables were crap, and that they were oxidising (they're not). The improvements were put down to me swtiching from unterminated cable to terminated, at one point.

Personally I think it's to do with argument presentation. If this had been presented as "guys, I think I might have found something, have a go, what do you think..." we would have had a lot more traction. Much like happened in the Doug Schroder Method thread. It baffles me how that idea can be so lauded and recieved with open minds when this is just met with closed doors.

No doubt I'll get a bunch of responses explaining why I'm wrong and how I don't understand anything. I'm going back to lurking. If you want more info feel free to message me.

For what it’s worth, I’d never spoken to Michael before this thread, we didn’t know each other. I’m not some plant for his grand marketing plan. (Exactly what a plant would say, right?)

I approached him via PM about how to do this, what I’d need, and whether he’d be able to build and supply (for a fee). He said he would. Unfortunately his prices are beyond my reach so, with his help, I went DIY.

I've spoken to Bill Low from Audioquest and he seems to really know his stuff, I trust his opinions (the ones I understand somewhat anyway), and like the sound my rig produces using his speaker cables. Been using his speaker cables for decades...in fact, it was a pair of his early cables that actually showed me there is a large sonic difference between speaker cables, and for that I'm, grateful...for this thread, not so much.