From the ManufacturerSennheiser HD 650With the HD 650, audiophiles will experience truly unique natural sound. With sound this good, long concerts in the comfort of your home are a certainty, so the HD 650 also sets standards in comfort and convenience. The HD 650 is a genuine masterpiece, which will satisfy even the most demanding listener. HD 650 the Reference Class. Balanced & transparent sound Elegant titanium-silver finish Optimized for hi-resolution recordings Made in Ireland Learn more about the HD 650Features a specially modulated connecting cable (detachable) made from highly conductive OFC copper, Kevlar-reinforced, with very low handling noise, i.e. low structure-borne sound sensitivity.Features Top-of-the-range open, dynamic hi-fi stereo headphones Systems with narrow tolerances ( 1 dB), hand-picked in pairs High-quality titanium/silver finish Neodymium ferrous magnet systems ensure optimum sensitivity and an excellent dynamic response Exceptionally natural, spatial and accurate sound Can be directly connected to stationary hi-fi components of the highest quality, in particular SACD, DVD-A and CD players Peace of mind - thanks to the 2-year international warranty Did you know?The HD 650 is a true audiophile headphone that features extremely lightweight aluminium voice coils to ensure excellent transient response. Sennheiser recommends this headset for...... The HD 600 is geared for your hi-fi stereo system. Best suited for all types of audio the HD 600 is a favorite among mastering engineers worldwide. WarrantyThe HD 650 is covered by a 2-year international warranty. Comparison table HD 600 HD 650 Frequency response 12 - 39000 Hz 10 - 39500 Hz Impedance 300 ohms 300 ohms Transducer principle Dynamic, open Dynamic, open Sound pressure level (SPL) 97 103 dB THD, total harmonic distortion 0.1 % 0.05 % Weight w/o cable 0.57lb (260 g) 0.57lb (260 g) Contact pressure ca. 2,5 N ca. 2,5 N Ear coupling Circumaural Circumaural Jack plug 1/4 / 1/8 (3.5/6.3 mm) stereo 1/4 / 1/8 (3.5/6.3 mm) stereo Warranty 2 Years 2 Years Why Sennheiser ?For over 60 years every Sennheiser mic or headphone comes with a built-in mission: to stay true to the sound and soul the music was given by its artist. From the fragile intimacy of a whispered word to the deep and dark punch of an attacking bassline. Sennheiser delivers pure emotion and excitement. A quality that has convinced a broad spectrum of artists and of course music lovers all over the world. Sennheiser offers a great experience for everyone who really wants to hear. Whats in the box? HD 650 1 adaptor to 1/4 (6.3 mm)Product DescriptionIn the HD 650, audiophiles will experience truly unique natural sound. With sound this good, long concerts in the comfort of your home are a certainty, so the HD 650 also sets standards in comfort and convenience. The HD 650 is a genuine masterpiece, which will satisfy even the most demanding listener. Putting on the headphones and using them- Put on your headphones and then pull the ear cups down until they rest comfortably over the ears. Make sure you have them the right way round by observing the R (right) and L (left) markings on the ear cups. For optimum sound quality, ensure that the ear cups are not covered.