IHas anyone compared these? How do they sound differently and is the RS2i worth the $$$ over the SR225i? And which is has brighter treble? Headroom told me the RS2i is brighter in the treble but their frequency response graphs don't support this (I think their graphs are for the older version, not the "i" models). i've searched the archives to no avail (most info is for RS2 and SR225, not the current "i" models).