Hi Bill,
As luck would have it, I just took my Amethyst over to a fellow audiophiles house yesterday and we set up his OB GR Research Otica’s. He has the mains with a fully passive crossover and he has their triple threat OB servo subs. We used the amethyst to manage the mains and the sub in each channel. We had limited time so we opted to use the least time consumed method for setup which is to use the bass management setup on and stereo 2.2. Currently, he’s using HQ player and audio lens to manage them and we did a comparison of both systems and we each thought that the Amethyst did a better job integrating the bass between the mains and subs. That may not sound like a lot, but literally, we just hooked it up and then ran the optimizer wizard (measurements) and started listening. We did almost no fiddling with the many, many options other than setting a target curve that he likes. Whereas with the audio lens option, he’s had literally years to fine tuning, and yet we both thought that the imaging was tighter and had a deeper sound stage with the Trinnov. I think the Amethyst would work very well with the Duetas. I’ve owned several Apogees over the years and, although fantastic, I think they could use some help producing a better (flatter) response.
i hope that helps,
Paul