Topping presents a small but powerful DAC (Digital to Analogue Converter) and headphone amplifier combo. The DX1 uses an AK4493S DAC chip and offers DSD256, PCM 32bit 384kHz resolution. It also uses a discrete LNRD (Low Noise Reference Driver) circuit to filter out noise and interference from the USB power supply. Its dimensions are compatible with the E30, E30II, L30, L30II, so it fits perfectly into the Topping Rack.