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

b4icu;

   what type of conductor do you use? Btw, I have known & done this for decades but I still haven`t needed to use 0awg on anything. 


cakyol; you are correct on one thing but wrong on an other

What gauge is your poweramps secondary windings? This size defines how much power your amp will be able to push out. Forget about the amps max wattt rating, it is the amps dynamic capasity that defines the need of wiregauge.

Mine has 2x9awg windings pr side so I`m running 7awg solid to the woofers

You`re funny kijanki. Ever thought of trying out those calculations in real life settings? And if you did, do you have the skills to understand what you`re observing?