CTC is highly overrated. A very short CTC gives a wide directivity and a healthy CTC gets us narrow directivity at crossover. A narrow directivity avoids the floor and ceiling reflections in vertical MTMs. Though the effect is constrained to a very narrow bandwidth.The fact I am not able to fathom till date is gross violation of CTC rule and still some builds sound amazing !
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Also polar plots are rarely published so its difficult to guage the real performance of a speaker