Do you think that the designer/manufacturer of high-quality loudspeakers would knowingly use something that degrades the sound?Stuff happens.
We once got a new batch of NE5532 chips that had 10x the current draw. My company replaced 7 million Philips capacitors that did not meet the life spec. Of those replacements, several tens of thousand had to be replaced because if the bung was over the negative rail trace, it sucked out the electrolyte, shorted the buss and occasionally started a fire.