Hi,
There is one thread of mine where I discuss searching for the optimum loudspeaker cable for my system. This thread may be too challenging to read in one go but nevertheless has lots and lots of relevant technical information.
Jumping in at the middle starts from a reasonable place showing ‘lossless’ and ‘lossy’ calculations for calculating cable characteristic impedance. The link is here:- 'Audio Grade Solder' - Final Four LS cables and some surprising discoveries - #174 by Edmund-of-Essex
The most important thing to recognise is that the ‘cable’ (particularly loudspeaker cable) cannot be considered in isolation. It is part of a ‘system’ formed by the output stage of the amplifier, cable and loudspeaker.
My thread attempts to cover this topic in a humorous way. There are textbooks one can read if you want the science of it.
I note from your profile that you have a Naim Atom, however you have not declared which loudspeakers? Also, it is not quite clear which particular cables (I.e loudspeaker or interconnect) you are intending to change?