As continuation of the paper presented at AES 114th Convention in Amsterdam 2003 has prosecuted with the future works proposed in it. First of all, a prototype of the band-pass system has been made. It is a variable geometry system, so in the internal cavities volume as in the tune tubes number and dimensions. Following, different measurements on the band-pass system have been made in an anechoic room. Finally, comparisons between measurements and simulations were developed, as described in the previous paper. As conclusion, it is possible to say that the results of comparison are very positive, which allows to validate the simulations developed and to continue using them as a training tools both in teaching as in prototype developing.
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