The HD 25 Plus provides the same quality and comfort as the HD 25 and includes extra equipment: Two cables, a storage pouch, and a secondary set of velour ear pads. High maximum sound pressure level - ideal for professional and personal use: Excellent passive noise reduction and high sensitivity, and the option to use for single sided on-ear (supra-aural) 70 ohm nominal impedance for universal compatibility with all sources and split headband for secure placement on the head Broad frequency response range (Headphones): 16 - 22000 Hz; total harmonic distortion <0,3% Rotatable capsule for single ear listening High sensitivity due to lightweight aluminium voice coils Capable of handling very high sound pressure levels Very lightweight and comfortable, even if used for long periods of time Tough, detachable, single sided cables