hifi column bass speaker

Hi

been wondering if this sort of speaker would work. It is a bipole (not a dipole) with the two drivers wired in phase. mounted either end of a tube which is placed vertically on a stand to allow ratiation from the bottom driver. the idea is that you get an increase in directivity in the horizontal plane and some cancellation upwards and downwards. should work over a couple of octaves before you get ridiculous comb-filtering rather than a doughnut-ring shape. idea is to increase direct over reverberant sound field so that it behaves more similarly to a dipole midrange than a monople woofer would.

speakers are mounted opposite each other so shouldn't vibrate the cabinet and floor. I'm not sure whether it makes sense to divide the tube internally and/or to fill it with stuffing. could also set one or both drivers back from the end of the tube a bit to adjust rear volume and change the path lengths.

very easy to buy a bit of sewage pipe and test this so will do so ASAP. I can't find any online reference to this sort of design - is that because it's mental?

Phil

this sim doesn't show any of the directivity effects. just seeing if it is realistic with tube volume and stuffing to get some decent output.

can anyone point me to a better pipe than this?

also just remembered I can't get Akabak to run on a 32-bit emulator on this windows10 machine for some reason :( might have to dig the old PC out from under the bed.

sgarfa wrote: i run akabak in VMlite xp mode ..on win10 without problems

thanks, will try that. I tried using Oracle VM VirtualBox and got an error message "Raw-mode is unavailable courtesy of Hyper-V. (VERR_SUPDRV_NO_RAW_MODE_HYPER_V_ROOT)."