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

They have better speaker cable. Isn't that good enough?

I’m positive that I have the correct speaker cable for my amplifier. My Naim amp does not have an output inductor and can become unstable if the speaker cable used with it does not have high inductance and is not sufficiently long.

The kind folks at Naim have made NACA5 speaker cable for me, which when used in lengths between 3.5 and 10 meters is the perfect match to my amp. And it’s not too pricey either. Case closed.

I am an engineer and designed chemical, electrical, and mechanical products. I am retired. Designed cables for instrumentation since the 80's, started recording in the 70's. The design your are suggesting might be Ok for the entry level. I would suggest that you try Oxygen Free Highly Conductive copper for your cabling. If you can not hear the difference maybe you should have your hearing checked.

Mr. tom1000

Thanks for your advice. It is not my design. It is my calculated wire with a resistance values to fit the amp's output resistance. Your OFC been grounded thin already on this thread. After all you are a late comer. A normal cooper wire is 99.8% pure (by industry standard). The OFC (Oxygen Free Highly Conductive copper), has only 0.1%-0.19% better conductivity than the ordinary wire. In my calculation it is negligible. In real life, no one can hear that difference. The OFC and purity are just to get you pay more for something that does the same job. Go for it. I'll spend my money elsewhere.