Beyerdynamic DT 770 PRO Over-Ear Headphones (32 Ohm)Beyerdynamic's DT 770 PRO is a closed dynamic headphone, designed for mobile critical music and sound monitoring. The sound of the DT 770 PRO is, without a doubt, a benchmark for professional users. The secret lies not only in the cutting edge drivers, which are hand made in Germany, but also in a very sophisticated bass reflex system. The membrane can breathe in an otherwise closed housing and is therefore extremely quick and precise in its response,