Audiophilepure

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” The treble has really nice airy extension to it, though there is just a little bit more grain to it than some higher end models like Sennheiser’s own HD 800. Running out of my Glenn OTL tube amp, I felt that my 300 ohm headphones (HD 600, HD 800, ZMF Auteur and Atticus) were all able to achieve a more grain-free, transparent sound. In other words, I don’t think the 150 ohm HD 660 S has quite the same level of scalability as the others.”