I bet if you looked inside most speakers you’d see they most likely are just using standard 12-16 gauge speaker wire to connect the binding posts, crossovers, and drivers. Nothing fancy. So it doesn’t really make any sense that some super fancy crazy expensive cable from the amp to speaker would make any difference at all.
Having delved lightly
into the internals of speakers, many will say to use 18AWG hook-up wire on the internals. I chose 16AWG for my own projects.
Most such hook-up wire will be stranded, and at least through Parts Express, they sell 16, 18, 22, 24, and even 26AWG Single Conductor hook-up wire. Just perusing several products now, none is even marketed as OFC.
Hook-up wire aside, the leads of the XO Components themselves are much thinner, with the exception of the Inductors, I should say, where the beefiest are Air Cores consisting of 13 or 14 AWG solid core conductor. However, most Inductors used in the XOs will be 18-20AWG depending on their actual purpose and the goal of the designer.
Lastly, lets consider what may be used to wire the VC of your Drivers. One site posits that anything from 28AWG in the most robust applications up to 38AWG in smaller more delicate products can commonly be found.
It's been a while since I saw one metric that indicated how long the total wiring of all internal components added up to in an average Speaker... suffice it to say that it was not a short distance.