I am selling my Sennheiser HDV 820 amplifier. I am the original owner of this HDV 820. It is in as-new condition as are all of the original boxes and packing materials. The Sennheiser HDV 820 Headphone Amplifier is in excellent condition, there is no wear and tear and is fully functional. No scratches, no marks. Everything is perfect. Everything is in good working order. Sennheiser HDV 820 Digital Headphones Amplifier is the next generation of digital headphones amplifiers. Designed to complete the Sennheiser audio experience and perfectly complement its high-end audiophile headphone range for the ultimate acoustic performance.