I never said it was a “theory”. But there is plenty of debate about its significance and audibility. The only reason it’s of particular importance for ESLs is because they tend to be full range or nearly full range sources. The best reason to use a subwoofer with an ESL is far and away relieving the main amplifier and the main speaker of reproducing extreme low bass frequencies, not because of Doppler distortion, in my opinion. Also, and with respect, you do tend to choose from a list of causes to explain a list of objectionable effects without much experimental proof of a relationship between the two. If you heard what you heard and it was fixed by adding a subwoof, that’s not proof you heard Doppler distortion.
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Dear @mijostyn : I refer to you because lew don't took in count my post to him, aniway here I come with you:
""" It is much less of a problem for two and three way speaker systems because the bass driver's range is limited. """
Not exactly " much less " because in a 2-way speaker normally its woofer goes from 50hz-60hz up to around 2.5khz and this kind of speakers ( its woofer ) goes down to 40hz even if you don't noted so there exist a really high IMD kind of distortions that subs relief the bass down there and midrange and HF shines as never before. Same with 3-way speakers.
We can't just stop the developed IMD that as you pointed out modulates/color the whole speaker reproduction. Maybe we don't noted because we already are accustommed to that color/modulattion but when we add a pair of self powered true subs and through high pass filters only a deaf audiophile can't hear that new and lowered distortions " color " with ( between others ) additional advantage that any amplifier will increment its headroom due that now is liberated of that main bass range.. If we like it the new " color " is not the main issue.
Ok Lew, All I can tell you is what you get rid of when using subwoofers under ESLs does not sound like typical IM or harmonic distortion and it is most definitely modulated by the bass. If this is not Doppler distortion then perhaps you can come up with another name for it.
Seems we are going off-topic again! I used to subscribe to Gramophone, both for advice about recordings to buy, and for equipment reviews. In those days (1980's > early 1990's) it was a given that a serious UK listener owned a pair of Quad ESL63 speakers, but there was a good deal of debate about whether they might be teamed with a subwoofer. My answer to that appears above. Briefly, yes, and easy to do.
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