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NAD C 399 BluOS-D integrated amplifier ($2,599)

NAD C 399 BluOS-DLots of integrated amps—which combine a power amp and a preamp—now incorporate some kind of streaming, but the C 399 BluOS-D has the best kind of streaming: BluOS, which can play high-resolution files stored on a networked computer or hard drive, as well as all major streaming services. The 180-watt-per-channel amp also includes a subwoofer output, an HDMI ARC input, a phono input, and Dirac Live, which automatically calibrates your audio system to sound best in your room.