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the Amp-23R has the tonal linearity and noise floor of a reference headphone amplifier combined with the output power to drive demanding loudspeaker loads
driven by 6N6P double triode
immersive listening sessions above critical analysis
not a general-purpose computer
Sennheiser HD660S2 Open-Back Headphones Tube Amps the Amp-23R has the tonalThe latest evolution of Sennheiser's legendary HD 600 series, the HD 660S2 delivers a tuning refinement over its predecessor with more extended bass and a smoother overall response, while preserving every bit of the midrange magic that made the series famous. Type and Technology Over ear, open back, dynamic. 38mm transducer with Sennheiser's precision engineered aluminum voice coil. Handcrafted in Ireland. Sound Character Warm, refined, and
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