I would suggest reading the science behind the idea before dismissing crosstalk cancelation as a gimmick or false effect. Your explanation is actually making a false comparison. You are assuming that the way we hear actual instruments matched how we hear those instruments reproduced over two speakers. It’s a very common anti-SDA claim but it’s not correct. You don’t have to like it, but crosstalk cancelation is an area of significant research for a reason. Not by knowledge less neophytes starting speaker companies but PhD researchers searching for a better understanding of how to recreate 3D sound.\n\nthe natural crosstalk that you hear when you hear a real instrument is already baked into the recording. The crosstalk you hear in a room with speakers is not natural. It’s not supposed to be there.\n\nhttps:\/\/www.princeton.edu\/3D3A\/Publications\/BACCHPaperV4d.pdf\n\nhttps:\/\/asa.scitation.org\/doi\/pdf\/10.1121\/1.1566419\n\nLook at what they reference and find those papers as well. You will see that this is based on sound science.\n\nthe holy grail for accurate sound reproduction is high order ambisonics and those systems rely on high directivity speakers and digital XTC. that is because it is most accurate and realistic when there is minimal crosstalk. It’s a distortion.\n\n\nThese papers are talking about something a lot more complex, than sending a passive reverse phase signal to some outside drivers.\n\nTo do this, even if you think it desirable, which in my view is highly questionable, would take extensive active DSP processing as mentioned in the papers.\n\nFor one thing I don't see how a passive network will not send an inverse phase signal to a set of drivers when the signal to each channels is identical in phase and intensity. That is the characteristic of a dead center signal. You certainly don't want to cancel that in any way. I do not see how those signals can be isolated and not have their phase reversed without extensive and complex DSP.\n\nEven so the sweet spot problem would remain.\n\nThe fact is that microphone technique can solve most of these problems. The scandal is that pure Blumlein is rarely used and it should be used almost always in concert halls and large spaces.\n\nI have had no trouble making recordings, that recreate a really good approximation to the original sound field, through good speakers. The DSP of the Dolby up mixers just makes it all the more realistic. With the right source my 7.2.4 system produces and incredibly realistic sound field with the best of recordings. The YouTube video I referenced above is one such.\n\nI strongly suspect that SDA hokus pokus would ruin it.