I've only measured using my ears as opposed to a sound pressure meter, but when I play a test tone record through the OHMs in their respective rooms, I hear a very balanced level all the way down to 20hz (on the 5s, the 2s/100s may not go down into the 20hz range). And when I listen the overall timbre including bass levels is in line with what I hear at most good sounding live concerts, at live-like SPLs.
My gut feel is that a sub is only of value with the larger OHMs in very large or acoustically challenged rooms perhaps or for people who just like higher bass levels, or some combination of these factors. And in those cases, the sub had better be able to blend in smoothly down to 20 hz or so (for organ music, etc., most recordings have nothing that low) or else the overall timbre and clarity can suffer. I think this is the case with most any speaker if one goes bass crazy, the bass ends up masking the midrange, which is where most of the unique magic of the OHMs resides.
I do not set my 5s to maximum bass levels in my biggest room where they reside. I find when I do, the overall clarity of the midrange in particular gets buried and things to not sound as good or natural overall to me. Not sure if that would be any different were it a sub putting out that extra low end rather than the 5s.
My gut feel is that a sub is only of value with the larger OHMs in very large or acoustically challenged rooms perhaps or for people who just like higher bass levels, or some combination of these factors. And in those cases, the sub had better be able to blend in smoothly down to 20 hz or so (for organ music, etc., most recordings have nothing that low) or else the overall timbre and clarity can suffer. I think this is the case with most any speaker if one goes bass crazy, the bass ends up masking the midrange, which is where most of the unique magic of the OHMs resides.
I do not set my 5s to maximum bass levels in my biggest room where they reside. I find when I do, the overall clarity of the midrange in particular gets buried and things to not sound as good or natural overall to me. Not sure if that would be any different were it a sub putting out that extra low end rather than the 5s.