Once you load your music onto the 8 GB of onboard flash or insert a Micro SD card, the DX90 processes every track through dual ESS Sabre32 ESO9018K2M DAC chips, dedicating a chip to each channel for full clarity and separation. To make sure you have enough power for proper amplification, the DX90 includes dual Soundplus OPA1611 op-amps as well as dual Texas Instruments BUF634 current output buffers. If you’d rather bypass the op-amps and use your own external amplifier, simply plug in through the line-out jack. Should the standard playback be not quite to your liking, you can select between low, mid, and high gain with the three-setting gain switch.