Changing filter Arcam Black Box 3

I need some help with the following:
At the moment I have replaced the digital section of my BB3 with (part of) this DAC http://www.diyaudio.com/forums/digital-line-level/137976-experience-diy-dac.html .
I think it should be possible to lose the BB3 brickwall 20 KHz filter because I am using 192KHz/24 bit upsampling. Is this true?
If so, can anyone help me identify the filter components on the BB3- schematic (attached) ?
Also, what components are needed here for a less steep filter?

Lot of questions, help very much appreciated.
 

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