I find the Osiris handles the MB2se with no problem , even bass. When i bought the PMCs i did wonder if the Osiris was up to it and even PMC had no experience of using them with an Osiris.
But they very kindly let me have a brand new pair on home dem.
When we installed the Townshend Podiums, even my dealer remarked how well the Osiris drives them.
I was happy with the bass before, with having a treated room, but adding the Podiums has tightened it even more. Seems slightly more extended , but that may be because its cleaner. But starts and stops very cleanly , and much better impact.
Very happy all round.