If you use screwable wire crimps from Home Depot, you will have a luxury of disconnecting your speakers if necessary.
Crimped connections are superior to soldering and you can use actually any but each time you'll have to cut wire, strip isolation and re-crimp again.
Other than that I do not see why warranty should void. Just do a clean job and make sure you'll put wires back together to the binding posts when bad comes to worst.
Crimped connections are superior to soldering and you can use actually any but each time you'll have to cut wire, strip isolation and re-crimp again.
Other than that I do not see why warranty should void. Just do a clean job and make sure you'll put wires back together to the binding posts when bad comes to worst.