The Ultrasone PRO 2500 (formerly the PROline 2500) is the open-back counterpart to the PRO 750. Using the same 40mm titanium plated Mylar drivers, the open ear cups of the PRO 2500 create a sound that is even more rich and true to life. This makes the PRO 2500 an excellent choice for serious audiophiles as well as legendary studio professionals. If you are looking for a second set of headphones or a back-up for your current monitors or speakers, then the PRO 2500s are the headphones for you. Newly updated, the PRO 2500 now features thicker ear and headband pads, a brushed aluminum nameplate on the ear cups, and a nylon hard case to protect your headphones on the go.