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Re: Endfire sub array under a stagePeter,Jamie Anderson and I measured this exact effect at the second to last get together in MA a few years ago. We found there was about 2dB of loss, fairly broadband, going from the 3 high array to either "bottom box reversed cardioid" or "three in a line really close endfire". I am sure that DDT doesn't show this because, like basically all programs, it doesn't account for acoustic radiation impedance. Doing so is extremely complicated, processor intensive, and prone to error. Basically you have to do a finite element plot for every point you want to predict, much more complicated than the otherwise quite accurate superposition of phase and magnitude most (all?) visual prediction programs use.
Re: Endfire sub array under a stage
Peter,
Jamie Anderson and I measured this exact effect at the second to last get together in MA a few years ago. We found there was about 2dB of loss, fairly broadband, going from the 3 high array to either "bottom box reversed cardioid" or "three in a line really close endfire". I am sure that DDT doesn't show this because, like basically all programs, it doesn't account for acoustic radiation impedance. Doing so is extremely complicated, processor intensive, and prone to error. Basically you have to do a finite element plot for every point you want to predict, much more complicated than the otherwise quite accurate superposition of phase and magnitude most (all?) visual prediction programs use.
