The Marantz HDDAC1 is a headphone amplifier designed to appeal to audiophiles looking for a solid unit with decent connectivity options. The HDDAC1 is capable of driving headphones up to 600ohm, and can be directly connected to a Hi-Fi integrated amplifier or a pair of active speakers or power amp. The HDDAC1 can also playback audio from other devices by using the optical, coaxial, and USB connections.