This is my review and impressions of the Sennheiser HD25-1 II headphones. Find out how they hold up on the decks and in the studio! Please rate and subscribe! Specs: - Contact pressure: 2.5 N - Frequency response: 16 - 22,000 Hz - Jack plug: 3.5/6.3 mm stereo - Load rating: 0.2 W - Nominal impedance: 70 Ohms