Marantz HD-DAC1 USB-DAC Headphone Amplifier This is a high-grade headphone amplifier from Marantz. Operation has been confirmed. Unlike inexpensive Chinese-made DACs, this is a very well-built headphone amplifier. Despite its compact appearance, it has a solid body packed with components like a large power supply, giving it a substantial weight. It also has a luxurious feel, with an aluminum volume knob. The exterior shows some signs of use overall. There are some scratches on the top panel. Included accessories are the power cable and USB cable.