The Audio Research DAC9 digital-to-analog converter decodes the most advanced formats using lamp cascade technology. Five digital connections - USB, RCA, BNC, AES/EBU, and Toslink - enable the connection of all your digital sources. The Quad DAC architecture provides a balanced digital signal, wide dynamic range, and decoding resolution from the Red Book CD up to 384 kHz and the sampling rate of native DSDS. A pair of 6H30 lamps are the heart of the analog circuit.