^Agreed, the area in which to expect SQ improvement from 2808 to 1712 is with the DynEQ feature when listening below reference, especially with film soundtracks off shiney discs. Critical music listening is trickier and depending on the recording compression you might need to dial in DynLevel Offset of 5, 10, or 15, so I sometimes just turn up the music rather than fiddle with it. But years ago I compared the 789 (1909) model vs 988 (2808) and chose 988 because of better SQ despite losing DynEQ.
So otherwise I wouldn't expect a lesser # model 1712, even with the same MultEQXT as the 2808, to sound better. I can't keep up with the audio (much less other!) feature sets such as AL24 plus, DSD and HDCD processing, DACs, etc., of various models, but it would be interesting if they even sounded basically equal in other ways.