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As written in the text, there is a difference that people feel in the low frequency band. However, the A500 shows a distortion rate of 36% at 28hz frequency based on 80db volume. This is clearly a lot higher than the distortion of other speakers.
In addition, S400 is a passive speaker, and it is a speaker that basically has a frequency of 30hz on an in-room basis. However, the A500 is a bass that forcibly raises +10db or more with dsp eq around 25hz. The fact that it was forcibly lifted means that there is a side effect, although you can hear the sound around it. Depending on the person, it may be big enough.
In fact, when my acquaintances listened to the A500, the ratio of those who experienced low-frequency distortion and those who did not feel it was 5:5.