I found one of the pairs of speakers to be VERY muddy sounding, which when reading other professional reviews, was never a criticism of the speakers. So I wanted to start some technical tests and investigate what was going on. All of the following graphs and experience comes from an real world, untreated room. So there will be reflections and some natural room issues.
Below (graph #1) is the in room frequency response of a single of the speaker @ 1 meter. Right away the results seem to correspond to what I was hearing, a big ugly wide hump @ 150hz with everything else being acceptably flat.