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Amazon.com: 1Pair 40mm Audio Replacement Headphone Speaker for Dr. Dre Studio,Studio 2.0 Studio 3.0 Headphones,for Bose Headphone Quitecomfort QC25 QC3 QC2 QC15 AC25 AC35 AC3 AE2 OE2 : Electronics
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Amazon.com: Dekoni Audio Headphone Replacement Earpads Compatible with Bose QuietComfort 15/25/35 Series (Choice Suede V2) : Electronics
Despite their different nature, how does the Bose QuietComfort 20 compare to the Bose QuietComfort 15? - Quora
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Headphones sensitivity, impedance, required V/I/P, amplifier gain | Headphone Reviews and Discussion - Head-Fi.org
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AES 2012 paper: "Relationship between Perception and Measurement of Headphone Sound Quality" | Page 3 | Headphone Reviews and Discussion - Head-Fi.org
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