I am working on an idea for a semi open baffle speaker. The (sub) woofer is open baffle and the tweeter monopole.
For midrange I am thinking about using a Faital Pro 12FH520. I could make the midranges monopole or dipole. But more interesting to me is a gradual change over it's passband from dipole to monopole.
I sometimes saw open back or H frames with felt curtains hanging behind the driver. Sometimes more like aperiodic enclosures where the damping is in between mesh and there are no gaps but covering the whole back. Then there is true aperiodic where the vent is significantly smaller than the driver SD.
I don't have a clear outlined question but would like to hear from people who have used these kind of arrangements.
What would be the best way for the driver to gradually go from dipole to monopole behaviour from 120Hz - 1200Hz?
For midrange I am thinking about using a Faital Pro 12FH520. I could make the midranges monopole or dipole. But more interesting to me is a gradual change over it's passband from dipole to monopole.
I sometimes saw open back or H frames with felt curtains hanging behind the driver. Sometimes more like aperiodic enclosures where the damping is in between mesh and there are no gaps but covering the whole back. Then there is true aperiodic where the vent is significantly smaller than the driver SD.
I don't have a clear outlined question but would like to hear from people who have used these kind of arrangements.
What would be the best way for the driver to gradually go from dipole to monopole behaviour from 120Hz - 1200Hz?
FWIW, etc., in my experiments I mounted the baffle on an old pet cage and started tweaking with a much earlier version of OC 703, so recommend it or something similar, though in my case I was only interested in it closing up around 500 Hz where the horn took over.
In theory then for 120 Hz: ~34400/pi/120 = 91.25 cm wide - (~ (91.25*0.61) = ~ 5.67 cm) = ~85.68 cm/120 Hz acoustic baffle width.
In theory then for 120 Hz: ~34400/pi/120 = 91.25 cm wide - (~ (91.25*0.61) = ~ 5.67 cm) = ~85.68 cm/120 Hz acoustic baffle width.