Interesting little unit from miniDSP: HA-DSP. DSP Headphone amplifier Equalizer, PCM and DSD capable, Floating point 400MHz SHARC DSP for FIR + IIR correction/crossfeed to equalize your headphones.
Data sheet is here.
DAC chip: ESS Sabre ES9018K2M
Maximum output: 100 mW + 100 mW (32Ω,1 kHz...