I've been getting numerous requests to test the Filter 1 vs 2 settings for Fs = 44.1kHz (CD sampling). As a result, I set up the test to compare.
Filter 1 - Marantz "audiophile" sound tuning recommended for music listening
Filter 2 - Bench Test mode, designed to look better on the test bench for those that listen with their meters, LOL
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You can see Filter 1 has a -3dB roll off at 20kHz while the Filter 2 setting is flat to 20kHz. Filter 2 is a much sharper rolloff after Nyquist.
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Interestingly both Filter 1 and Filter 2 have very good stop band attenuation with Filter 1 allowing more out of band noise up until 35kHz.
I will try to do some listening test comparisons once everything is installed.