Sennheiser HD 600 Over-Ear Open-Back Headphones (Open Box) don't recommend eartips the precisely designed cavity structure

the precisely designed cavity structure makes the sound volume

(Full Range)

The FH9's shell is specially engineered to eliminate unwanted harmonic resonance generated as sound waves travel through the shell

AN EYE FOR DETAIL

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Sennheiser HD 600 Over-Ear Open-Back Headphones (Open Box) don't recommend eartips the precisely designed cavity structureEngineered for absolute clarity The HD 600 is the audio purists choice for reference playback. An instrument of Sennheisers passion for perfect sound, it is globally recognized as the standard for analytical high fidelity listening even 20 plus years after its release. X Ray Specs The HD 600 was developed to give audiophiles an impartial scale of everything before it in the audio chain. Purpose built to vanish when the listener presses play, the HD