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quick question - what would be the major differences between the ER-20's and the "Musicians' Earplugs" (ER-15, ER-9, ER-25)?
i know the ER-20's provide ~ 20 dB of isolation and the ER-15's are listed (on www.etymotic.com) to have 15 dB of isolation, YET the site says, "Musicians and others who need high-fidelity hearing protection for long time periods, or those who need different amounts of protection, may prefer the custom-fitted ER-9, ER-15 and ER-25 Musicians Earplugs."
if the ER-20's isolate more, why are the ER-15's etc. better for "long time periods"?
i must be misunderstanding something here. any clarification is appreciated.
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