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be wrote:

I have a two horns covering from around 150Hz and up, with a crossover frequency around 700Hz, So my system is probably less sensitive than yours with the many chanels and higher crossover frequencies. But I have changed my mind and will try anyway.

OK, let keep the “frequency response problems nearby horns axis” aside as I do not think I will hear any further explanation about it (they just do not exists :-). You should be able to observe the effect at 700Hz, to keep it more demonstrable you might contra-phase the driver and look for redaction of sum signal instead of increase the signal.

In another note: this conversation kind of “got me” and I consulted with people, who know theory well, asking them to provide their explanation of the angling phenomena. They explained the phenomena by the smearing the arrival time due to introduction of distance difference (when we angle the driver) between one side of the diaphragm and another side (let call it Distance Smearing). So, with angled driver the waves from one side of cone have different distance to travel then the waves from other side of cone.  I admit that it might be more elegant explanation then my Chomical Aberration but even the Distance Smearing explanation does not explain everything to me. For instance accruing to the Distance Smearing the best positioning shell be when multiple drives are located on curve and point directly to the listening spot, or all channels are angled. In practice is it never works - as I said above - it very severely shorts the acceptable listening distance.

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