Have looked into the topic of loudspeaker cable resistance and have come up with this.
The important thing to remember is to make sure the cable resistance is much, much less than the DC resistance ( or impedance )of your loudspeakers, typically 8 ohm.
The present day thinking is to make sure the cable resistance is no greater than 0.05ohm for a 3m length.
For example, for this cable with a 2.5mm diameter core, you can use up to 7 metre of cable
and you would be less than 0.05 ohm. If you pay any more for thicker cable you are wasting your money because you would not hear any difference between the two.
Also twisting the bared copper cable around a terminal is also OK they are nearly always gold plated on even budget speakers such as Wharfedale 10.1 , you need not buy fancy plugs.
Any talk of capacitance or reactance is irrelevant, do not be tempted to spend hundreds of pounds on super duper gold/platinum or any other exotic metal. Oxygen free copper is the best so long as it is thick enough.
Regards, Ken Rhodes B. Met(Metallurgy).,Dip. Ed., B.Sc. ( Honours Degree in Physics )25m Quality Oxygen Free 2 x 1.5mm 130 Strand Loud Speaker Cable by electrosmart