Its simple. Great quality audio starts with great headphones. Dont miss out on the music you love. The PreSonus HD9 Closed-Back Headphones are ideal for audiophiles and professionals alike. PreSonus know the importance of a great mix. Thats why the HD9 are fitted with powerful drivers for an accurate bass response and articulate highs. That means better audio on the move and precise mixing in the studio. If youve worn headphones for long enough youll be familiar with listening fatigue. Put the pain in the past with comfortable earpads and a lightweight design. These headphones are ready for anything offering complete connectivity from an 1/8″ to 1/4″ and safe storage from a convenient storage bag. Get ready to hear music in ultra-high definition.