Etymotic Research ER4P MicroPro Earphone REVIEW
March 30, 2014 Comments Off on Etymotic Research ER4P MicroPro Earphone REVIEW
“Etymotic has identified a niche that’s been profitable enough to justify a 20-plus year run of these ‘phones. Audiophiles who prefer the unvarnished sound of their music have made the ER4’s a success, and will no doubt continue to do so.”
Audiophilepure 
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