PreSonus HD9 Professional Closed Back Over-Ear Monitoring Headphones Emerald Reed Company Three levels of attenuation are

Three levels of attenuation are available

Bass mode lowering the pitch of all strings to Bass guitar tuning

You also get all of the features found in our Maestro Notation program

which affects the diffusing network

Syntik-DR drum synth

PreSonus HD9 Professional Closed Back Over-Ear Monitoring Headphones Emerald Reed Company Three levels of attenuation arePresonus HD9 professional studio headphones feature 45 mm dynamic, neodymium drivers in a closed back acoustic design that provides superior listening isolation and reduces headphone bleed. Its tailored frequency response extends all the way from 10 Hz to 26 kHz, with accurate bass response, enabling precise mixes. The HD9 offers high power handling (900 mW per channel into 40 Ohms) while providing comfort, durability, and reduced listening fatigue.