I have the 563A. I believe the internal crossover points are 120hz for SACD and 200hz for DVD-A. I saw that in a review somewhere. Both are way too high for good sound. An ICBM would work well with my 1050, but I have only 1 SACD. I don't have the extra cash to add to that on any regular basis, so I'm debating whether or not to add an ICBM.