S Koons wrote:
"Arny Krueger" wrote in message
...

By definition, exposed wire is not part of the contact between the
connector and the wire. IME if the speaker connector is tightened
down properly, the wire surface will still be bright at the point of
contact, should you later disconnect the wire.

I understand your argument. But in my case, I had turned the speaker
connector onto the wire as tightly as it seemed to tolerate, and the
problem arose anyway.

Key words: "as tightly as it seemed to tolerate". That suggests enough
subjectivity that the outcome might be unpredictable. The phrase does not
preclude judgments based on screw-type speaker cable connectors that are
inadequate.

A good crimp tool will squeeze a spade onto
the wire more securely. Better safe than sorry.

Key words: "A good crimp tool". Most of the common crimp tools one finds
aren't really very good. They are probably the reason why so many people
distrust crimped connections. OTOH, done right, rally good crimped
connections are the best. If you take them apart, the wire and connector are
cold-welded.