Here's a great set of closed-back headphones with excellent sound quality
Sennheiser HD 205 II closed DJ-style headphones provide excellent sound quality and a brilliant shielding of ambient noise. The rotatable ear cup plus the single-sided cable make them a professional companion even for DJs. The elegant HD 205 are medium sized, supraaural headphones that provide excellent sound quality and brilliant shielding of ambient noise.
Wearing style: Headband
Frequency response: 14 - 20000 Hz
Sound pressure level (SPL) : 112 dB
THD, total harmonic distortion: < 0,5 %
Ear coupling: supra-aural
Transducer principle: dynamic, closed
Nominal impedance: 32 Ω
Jack plug: 3,5/6,3 mm stereo
Cable length: 3 m
Weight w/o cable: 206 g
Screw-on 1/4" inch gold-plated headphone adapter This adapter works great for hooking up your 3.5mm headphones to speakers, keyboards, synthesizers, audio mixers, studio mixers or any other device that excepts 1/4inch.