diyAudio Forums Archive > Top > Loudspeakers > Full Range math help needed - Click HERE for Original Thread hitsware I'm trying to come up with a simple formula to calculate the system Q (Qs) of an open baffle. I have found empiricly that if the cutoff frequency (Fc) of the baffle = Fs (of the driver) x Qts (of the driver) then Qs ~ 0.7 (max flat). Also we know that if the baffle is infinite then Qs=Qts. So.............. Given: Fs, Qts, Fc Find: Qs Thanks for any help........mike hitsware ..... http://home.comcast.net/~jhyamamoto/Baffleless.xls

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