Designed to the ultimate in Marantz audiophile clarity, The HD-AMP1 Digital Built-in Amplifier serves as the heart of your music and features the latest digital audio technologies that deliver the ultimate in fidelity from the widest range of audio sources. Equipped with multiple digital inputs, including 2 optics, 1 coaxial with 2 USB ports, the HD-AMP1 has the ability to decode the latest generation of high-resolution audio file types without loss, including WAV, AIFF, ALAC, FLAC in resolution -bit/192-kHz, with the ability to play MP3, WMA and AAC tracks. The USB-B rear port has advanced noise isolation, so you can connect your PC or Mac and stream files of even higher resolution, up to 32-bit/384-kHz. HDAMP1 is equipped with the ESS SABER DAC benchmark and dual main clock crystals for greater bandwidth, higher dynamic range and lower distortion, and HD-AMP1 can also play your favorite DSD high definition audio tracks including 2, 6/5.2/11.2-MHz. The powerful amplifier features high-resolution D technology and has a wide dynamic range, extended frequency response and high current capacity - HD -AMP1 fully rated transmit low-resistance 4 ohm speakers at 35 watts per channel at 8 ohms and 70 watts per channel at 4 ohms. All over the HD-AMP1 there are 3 circuit blocks featuring our exclusive HDAM-SA2 technologies, including the analog front end, D/A I/V converter block and the exclusive headphone amplifier block, which also has 3 selectable gain levels to handle the widest range of headphone resistors and has its own volume control. In addition to the digital inputs there are 2 analog inputs and there is also a subwoofer output. For compatibility with the widest range of speaker cable terminations, the HD-AMP1 has the premium SPKT-1 connection.