Spectral is pretty adamant about nothing in front of the 260 but another Spectral preamp, so not sure about using a sub with an active/passive crossover. I have a chance to hear the Magicos, so that would be a possibility. Anats are a possibility, but have heard mixed reviews. Magicos and Wilsons are just too heavy to audition in my house, so it is hard to make that expensive move without hearing them in my environment.