@unsound digital signal from input no matter which frequency and format is resampled by DSP chip to 24/96 PCM (unless they changed it), analog input is converted by ADC chip to 24/96 PCM (unless they changed it) and sent to DSP chip for further processing, signal is consequently buffered, RC/EQ applied by DSP chip and signal is sent to PWM chip, upsampled to 32/384 and sent to MosFET stage controlled by PWM controller...
in terms of db range applied I believe nobody knows and I don't think Lyngdorf will be willing to share this info
not sure what changed with TDAI-3400 but if I read the article properly user should be able to tweak the EQ with voicing tool