Sennheiser HD 660s Audiophile Headphones (Open box) - Discontinued eartips Selectable 33/45/78 RPM speeds

Selectable 33/45/78 RPM speeds

THD + Noise: TBA

Experience and expertise in tuning

A tube-switching key (TSK) allows the amplifier to accept 2A3

Audio-Technica ATH-M40x Studio Monitor Headphones

Sennheiser HD 660s Audiophile Headphones (Open box) - Discontinued eartips Selectable 33/45/78 RPM speedsHD 660S The perfect blend of power and control. The powerhouse open back headphone Connects you to the deepest corners of your music collection. Hi fidelity sound Open back design 42mm transducers Luxurious comfort Detachable cable A Direct Connection To Your Music Known for their engaging signatures and liquid smooth response, HD 660S predecessors HD 650 and HD 600 shattered performance barriers in the audiophile headphone category. The HD 660S