Speaker jumpers

Just to add to the internal wiring response,I had a pair of def tech some time ago.The sub went out and had to open it up to replace.I couldn't believe how cheap the wires were inside of that speaker.I was trying to use decent speaker wire,only to fine super thin wire inside!Hope my B&Ws have better wire than that inside!

My guess is the engineers weren't the ones who selected or designed that internal wire...

My own experience: 

https://forum.audiogon.com/discussions/bi-wires-links-for-speakers

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)