In my humble opinion the Sennheiser HD600 is by far one of the best sounding dynamic headphones on the market period hopefully you'll agree with me at the end of this review. Specifications   Frequency response (headphones) 12 - 39000 Hz Sound pressure level (SPL) 97 dB at 1 mW THD, total harmonic distortion 0,1 % Contact pressure ca. 2,5 N Ear coupling circumaural Jack plug 3,5/6,3 mm stereo Cable length 3 m Transducer principle open, dynamic Nominal impedance 300 Ω Weight w/o cable 260 g Nothing really much to see here...

The Woo Audio 6 is a transformer coupled tube amp that is extremely versatile and can pretty much drive pretty much anything you throw at it. It has a quiet enough background to drive IEMS and low impedance cans with no to minimal noise and high impedance cans such as the ones from Sennheiser and Beyerdynamic. It also can drive orthos although power may be lacking as it only outputs a maximum of 500mw with the stock 6de7 drive tubes. Although not ideal you should be fine driving the new modern more efficient orthodynamic headphones such as from...