Speaker jumpers

maybe you can explain what is wrong with steel

also, the notion that engineers are overruled by cost containment of the manufacturers for expensive speakers is just speculation

you can always do your own blind testing of course... or spend time & money on something that really matters (speakers, room, best source recordings)

Not speculation 

It's not simply cost containment, but that depending on speaker cables used the choice of preferred jumpers can be quite variable 

At the risk of voiding the warranty, take a peek inside.

Duplicate the internal wiring.

Other than that, I'll vote with jl35; match your speaker lines.

Any other 'esoteria'....well, it's your $.  Do what you want. *shrug*  MHO.

Not only do some speaker companies give their customers poor jumpers, but also some manufacturers of integrated amps include poor jumpers. There are not many easier and affordable upgrades to equipment than replacement of jumpers. 

Just as itzhak1969 relates, the results are so profound that it surprises people. Congratulations to those who have tried and found a simple, but effective way to improve the system.