I've also mused about quick temperature changes inside the chamber (heated air expands) reducing a woofers Xmax. Lot's of air in a large camber -> lots of mass to move -> higher Vas. Besides, as I undertand it, the mass of the air in the isobaric chamber changes some of the T/S parameters. Can you? Would you ever want to extend the response of the mid bass driver? Seems to me, it would just be better to get a different driver even if it costs nearly twice as much. But in my ignorance, I see no other reason. I seriously doubt you will want to try that with a bookshelf speaker.įorgive my ignorance, Tinitus, but am I misunderstanding your musings? An isobaric mid-bass driver? I suppose if one wanted to halve the size of an inner chamber, that would work well enough. I'm going with a twin iso chambers - 4 woofers per box. So your considerations will be quite divergent. Your space requirments are completely different from mine, though. For what little I know, it's acceptable to me as a first try. It should be better but I'm still quite the novice. Between all that, my F1 should be about 20.5Hz in a speaker that should get an average of 92db SPL. I chose my bass drivers for their low Fs and am building an (unreasonably?) huge box for them (331.6 liters minuse some bracing) tuned to 24Hz. I'm also toying with my first project and it also involves a isobaric chamber.
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