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It's not all that bad. See the above. We know
@Nuyes' technique is accurate.
It's a small speaker meant for short distances. If you add a high pass filter and a subwoofer you gain 5-10dB of distortion-free range. There aren't many small speakers with this kind of excellent directivity, which is far more important. Competing small Edifier speakers allow too many compromises. And the recent Aiyima S600 speaker (another review by
@Nuyes) showed it to be just terrible, although the distortion was lower.