Quote Andi:Quote ef37a:
Springs do not wear out/get weaker. They just break.
how does that work then? Are they as likely to break on the first flex as they are on the billionth? If not, and if they don't wear-out, then why not. I think those springs have an expected life during which they will operate within spec, but they are still "wearing-out" which means that they are still changing from flex to flex. The trick is to use materials and design such that the wear and tear of normal use has the minimal impact on the operational spec of the item. Thus your spring may not become less "springy" but it is becoming more "brittle" with use.
Provided the material is never stressed near its plastic point (and I think Hugh was playing a blind here and knew it!)springs really do last "forever".
When did you last hear of a valve spring breaking in an engine? There are thousands of centuries old clocks and guns that just keep working.
Or are we to suppose that speaker suspensions are not so well designed?
And IF burning in were true and I was paying 1000's for speakers I would expect them to come to me right!