Astell kern ak70 high resolution 24bit 192khz bit to bit playback digital audio player with 64gb built in memory the ak70s dac based on market proven cs4398 chips of cirrus logic has been used for years in hi fi audios and the second generation astell kern devices the ak70 plays back 24bit 192khz signals into bit to bit type 32bit audio is downsampled using a sample rate converter in addition dsd 64128 can be played back through conversion to pcm 32bit 384khz is downsampled to 24bit 192k