Double up on speaker cables

Idont see where it will hurt ,but having 2 different geometries on some frequencies 

may be phase differently , iguess you will find out.

might be interesting.

Many years ago a friend of mine read bout hooking up positive poles of Left and right channels into a center speaker to bring out detail recording engineers managed to drown out on master disc prior to pressing vinyl.

We laughed our butts off listening to Jimi Hendrix’ throat clearing, hawking and spitting as background noise from the studio came out clear as day.

It got too distracting as we went through a couple dozen LPs listening for this kind of stuff which really detracted from the overall “experience” (ahem…).

Not as much fun as hearing “I buried Paul” in that Beatles’ song (I was never really a fan but knew about this first-hand from my brothers’ TT)

But do let us know what you hear.  I suspect, as others mentioned, you’ll hear some smearing/slurring - increased sustain/delay - of some signals as they work their way through the different cables.

Cables don't make any sound they can only hinder frequencies so when you put them together you will only get the negative effects from both cables. It's not that one cable is airy it's that that cable has poor response everywhere else. Your speakers need to see a window of impedance and doubling the cables will change the impedance so there are at least 2 insurmountable problems in your experiment. 

The best cable is no cable at all, this is why powered speakers with line level crossovers are the future.

It's definitely better to post about the idea, rather than.... you know.....trying it.

I say use the ones that are "detailed and airy" on the positive side and the ones that "carry more mid bass" on the negative side.