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Originally Posted by Philips210
Something that has occured to me is how will the frequency response be affected with wear to the loudspeaker? Does it remain fairly consistent over the years or is there a subtle change due to wear in the cone and cone suspension. Does the composition of the paper cone degrade thus changing the frequency response. Humidity may also play a part in altering the acoustic properties of the speaker under test. No doubt the acoustic transparity of any lining cloths or speaker cloths may affect the overall response.
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High humidity is probably the enemy of speakers, apart from too many Watts damaging the coil, not least as rust can set in to the metal parts. Some speaker can suffer from the cone sagging, but paper seems very durable if used in good conditions. High volume settings can loosen up the suspension and cone surround that could alter the response of the speaker. But if looked after they will last indefinitely, even the magnets loose very little of their magnetism.