Peter, I considered an upscale external crossover to roll off the signal into the Sarastros (and I know many would think that would be prefereable). However, when I got the Fathoms in and set them up (with the ARO done separately on each speaker), the integration was so seamless and the sound has been so good I never felt the need to add all of the extra connections, components and cost. So yes, I am running the Sarastros full range.