It's a closed headphone. I use it in my small music production studio (www.cannes-and-bambou.com), which has no spare car registration. My old Sony MDR CD270 taient well. But thanks the perfect sound insulation and precision of the K271 Studio, nothing m'chappe. I can repeat a sound recording in the crowd because I hear all the default (knock on the foot microphone, parasitic drag of clothing, ...). The great comfort of this headset allows you to work 10 hours without the Journe ESG for around the ears. The sound turns off when removed quickly that feedback when possible prs console costs the mix during pregnancy.