I have measurement gear and a biamp with a PC crossover. The round top is the tweeter mounting flange and, as you'd expect from a round object 100mm in diameter there's a bad diffraction suck out at 6600Hz. This led me to the S11 and StigErik inspired design in the attached images (the dimensions are in inches and the Edge curves are successive steps off axis for the tweeter and woofers, starting on the tweeter axis and going out to 30 degrees off axis horizontally). Enough for my evaluation purposes and I'm curious to hear how reducing the baffle around the tweeter influences the sound. I've been following StigErik's Beyama thread and, while I don't have the Sd to go baffleless, back of the envelope numbers from Linkwitz's dipole SPL suggest I could get ~80dB at 75Hz with a minimal baffle and a listening distance around 2m. This limits the total woofer Sd per speaker to 258 cm^2 (both woofers combined) and excursion to about 5mm.ĭriver wise, the result is rather similar to Gainphile's S11, though he's got one big woofer where I've two. I don't want to buy drivers, so I'd like to reuse the drivers from my current two way box speakers-Vifa BC25TG19 tweeters and paired 6.5" OEM woofers that are quite similar to the Vifa XT18WH09. Regardless of the conclusion I reach the speaker's going to be a throwaway after a month or so of listening, so the emphasis here is quick and easy to build on the cheap. The speaker would be a prototype to give me some in depth listening time with an OB to see what I think of dipole sound after living with it for a while. I'd like to throw together a quick and dirty open baffle as a double check before proceeding on to more involved projects.
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