Topping presents the small but powerful DAC (Digital-to-Analog 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 the same as those of the E30, E30II, L30, L30II, so it also fits perfectly into the Topping Rack.