Accuphase DG38 vs. Tact vs Lyngdorf

I own the DG-38 and while it is truly a fine piece of engineering, its approach to achive a linear flat response at the listening position may be flawed. Even in an accoustically 'dead' listening room, speakers will not show a flat curve. There are technical limitations but more importantly, certain deviations will give the speaker its characteristic sound profile. You take that away and your speaker will sound boring. I am now struggling to make the DG-38 reproduce the original curve of my speakers but there is virtually no support for that anywhere. I am using B&W N800's. Cheers, Andreas