[sdiy] What's it take to pop a sandbar resistor?

[John P]

Sitting in my desk drawer is a momento of when my wife & I were first 
dating.
Back then, her stereo had a problem... the speakers sounded bad.  
Opening the speakers, I found that each one had a 9.4 ohm 10 watt 
crossover(?) resistor.   On each one, the leads had completely separated 
from the resistor body, leaving little green dimples.  One trip to Radio 
Shack & a little soldering later, speakers sounded *much* better.

My question is, what happened to the resistors that would cause the 
leads to fall off like that?
Too much current to the speakers?  I don't think it was humidity, or 
mice nibbling....

-- 
m/n/m/l
surreal electronic music, sound, noise
http://mnml.soulcatcher.net