This is a reverse private auction Sennheiser HD 650 has already finished

Sennheiser HD 650 Audiophile Open Dynamic Headphones A staple in the collections of hi-fi enthusiasts and audiophiles for over a decade. The Sennheiser HD 650s deliver a sound that has become revered for its outstanding clarity, balanced mid-range, crisp treble, and powerful bass impact. The HD 650's sonic performance is accurate and natural. High-performance dynamic transducers coupled with a specially-designed acoustic mesh ensure you can enjoy precise sound delivery with immersive depth and definition. The drivers in each side of these premium headphones have been hand-selected based on ultra-narrow tolerances (+/-1dB). Highly-optimised magnet systems ensure your HD 650s boast exceptionally-low harmonic distortion, making sure you hear every nuance exactly as it was intended. The open-back design puts you in the heart of an incredibly impressive sound stage, giving you the sense that you're stood in the room with the musicians themselves. The Sennheiser HD 650 Audiophile Open Dynamic Headphones give you a listening experience that you can feel, rather than just hear.