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Sennheiser Introduces new HD 400 Series Headphones at IFA 2015 | audioXpress
Sennheiser HD 400 Pro Review | headphonecheck.com
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Sennheiser HD 400 Pro Reference Headphones | Sweetwater
Sennheiser HD 400 Pro Review | headphonecheck.com
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Sennheiser HD 400 Pro Review: Professional Audio Perfection on a Budget - TechPP
Sennheiser introduces HD 400 Pro Studio headphones
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Sennheiser HD400 Open-back Studio headphones Review
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Sennheiser's HD 400 PRO Are Great Headphones For Mixing It Up In The Recording Studio
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Sennheiser Launches HD 400 Pro Headphones for Mixing and Mastering - 42West
Sennheiser HD400 Series - Acquire
