Spades vs. Banana plugs ??

@terry9 - The observation was not about allowing your connections to become corroded, which is never a good thing, but rather the irony that a group who mostly believe that every small detail can significantly impact the sound of a system would select less conductive connectors because they were easier to use, a generalization of course.  However, another example would be audiophiles who would never dream of using typical OFC (at about 101% IACS) copper cables instead of cables made from OCC copper (at about 103% IACS).  Would they use connectors made from an alloy that is only 40-60% as conductive as copper?

However, as @mammothguy54 pointed out, some are likely using all copper bananas, which are less common but available at a higher price.

bfa bannanas for me spades tend to work their way loose over time

@mitch2   I see that I misunderstood your post. I thought you were choosing theory over practicality - and a loose spade connector may not be detected as it gradually looses conductivity, leading to poorer sound over time.

Spades are a bolted joint.  Bolted joints are used a lot in a lot of places.  The one time they have a vulnerability is the configuration like a spade connector.  Generally they have a washer under them that doesn't stick out.  But a spade sticks out.  So long as the spade/wire isn't touched or pulled, all is well, but if the entnding lever is bumped or pulled, it will loosen the connection.

So I'm sure some people have great luck with them, as their connections live a quiet life.  Others, not so much.  

Just wanting to point out why we have different reports of experinces.

Jerry

Not my experience at all. My high end connectors on Scanspeak drivers and Bryston amplifiers all come loose with spades or bare wire, on their own, without mortal assistance. Poltergeist?

Of course, when loosing is a serious problem, lock washers are invariably used.