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What Would You Ask Sennheiser’s Axel Grell?
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Products like the acclaimed HD 600 and the signature HD 800 series open back headphones work with a variety of entry level and premium amplifiers both single ended and balanced. To your impressionable tastes, would Massdrop's HD6xx and the HD650 headphones really open up more with a single ended tube amp or output transformerless amplifiers and do push pull amplifiers truly bring the sound to a whole new level with the Sennheiser HD product line?