Tact RCS 2.0S Advise needed

Perhaps an Audssey might work better for you?

The TacT is actually a preamp/EQ/RCS, and as such; trying to feed the output of your NAD into(or through) it would be a problem(especially trying to adjust the gains). There is no way to bypass the preamp section of the 2.0, to utilize JUST the RCS/EQ features. If you are using the digital audio outs on your OPPO, to feed your NAD; you could connect the "front" L/R analog outs, to the TacT. OR- If your are using the OPPO's analog outs to go to your NAD; Use the digital Co-Axial out to the TacT. Then when you want to listen to your tunes; connect your amp to the TacT, instead of the NAD. I've been using a modded TacT 2.2X-aaa for over 5 years, and can't imagine life without it(especially in my present acoustic nightmare of a listening room).