You may find some useful information on this site. Just search for HDAM. For example, see if the following posts help You:
http://www.diyaudio.com/forums/digital-source/162029-marantz-hdam-tweak.html
http://www.diyaudio.com/forums/analog-line-level/150349-marantz-hdam-preamp-diy-kit-ebay.html
http://www.diyaudio.com/forums/pass-labs/40201-x-hdam-opamp-newbee.html
http://www.diyaudio.com/forums/digital-source/162029-marantz-hdam-tweak.html
http://www.diyaudio.com/forums/analog-line-level/150349-marantz-hdam-preamp-diy-kit-ebay.html
http://www.diyaudio.com/forums/pass-labs/40201-x-hdam-opamp-newbee.html
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