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View Full Discussion I emailed NAD about that high pass filter mentioned in the D 3020's white paper, and this is what I got back:
"Thank you for contacting the NAD Electronics Support Centre regarding the NAD D3020. Please be advised that the main output is unfiltered so always full range and sub out is -3dB @100Hz. main output is filtered only when Bass Eq is engaged but this is only required if using smallbook shelf speakers to get some more output around 80Hz."
I'm going to ask for confirmation, as this means that the white paper is incorrect.