Stainless Steel Binding posts on speakers?

Traditionally high end manufacturers tend to use the best conductors they can for speakers and amplifiers. Stainless is nowhere near the best conductor. If not copper, a better idea would be brass...

Mechans is correct about copper. If properly handled corrosion is not a problem.

One potential problem with Stainless is the galling effects of the nut on the speaker post- over time they may tend to lock up on the threads if the post and the nut are the same material.

Stainless cannot be soldered so it may well be that the actual resistance of the connection (since it is mechanical) is much higher than otherwise forecast.

Before SS was developed, tin was a favored non-corroding material. It would be a better conductor than SS and its harder than copper, so it would hold up. I am wondering why such a product has not appeared, but the SS one has...

Good- a different metal for the nut prevents galling of the threads.