Here are the far field frequency response graphs for my Phase IV prototype and my old B&W DM6s. Both have a trough at 110 Hz which I am assuming is a function of reflection in the room. The Phase IV has a trough at 215 which I think is internal reflection in the cabinet which currently has no damping whatsoever - so I need to buy the SAE 13 felt but at $80 I had been holding off. I don't imagine that it will make a huge difference when I put it in but I may have to design the crossovers. From 700 Hz and up the response is very flat and looks rather better than the DM6 which has a biggish hole from about 550 to 1.5k. I'm pretty much done with this experiment now and in March will be beginning a new design based on a similar approach to the cabinet but with better quality bass and high frequency drivers.
Three goals were accomplished with Phase IV: the first was to test the general approach to the design of the cabinet; the second was to test the design process from beginning to end, in particular the design of the crossover based on the measured 'in-situ' response of the drivers; the third was to build a speaker comparable in quality to my DM6.
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