well again sorry for the crappy drawing!
the pipe is essentially only holding the magnets and supporting the drivers. the rear of cone is completely open. think of drivers in baffleless!
in short, its a
'back-to-back connected(dipole!?)' + 'baffleless' + 'line array'
Drawing sniffs a 8 cylinder boxer engine 🙂.well again sorry for the crappy drawing!
the pipe is essentially only holding the magnets and supporting the drivers. the rear of cone is completely open. think of drivers in baffleless!
in short, its a
'back-to-back connected(dipole!?)' + 'baffleless' + 'line array'
OB is okay abbreviation just confusing that it ain't open baffle but open back.
Ok. The real question is.... Will such a design work? I am counting heavily on EQing to achieve 160hz at least
It has to be sealed and have LOTS of excursion capability (provided by 25 drivers), lots of power, and count of some room gain. Still probably somewhat volume limited.
dave
dave
so i will assume that even though for any driver Fs is limited to more than 100hz, still it can go below that in a large line array. i wonder if there exist some formula to calculate this without simulations beforehand to know with how many drivers in line array how much low it can go.
yes but more drivers means more excursion capability, more sensitivity, more radiating cone area....right?
using single driver won't reach 20hz while using 25 of them makes them to reach 20hz! so adding more drivers indeed make them go lower....otherwise there is no explaination how ids25 works!! 🙄
More drivers= more volume (of air) displacement
AND
Summation of outputs -When used properly - wavelenghts and coherence...
AND
Summation of outputs -When used properly - wavelenghts and coherence...
Use any bass reflex simulator like winISD and pick sealed alignment, I think they let you specify the number of drivers (8 or whatever your case) and the overall volume. I think new winISD also has EQ capability and then you can apply and take it to xmax and see what the SPL level is at whatver freq extension you are looking for. I would do it for you in Akabak as that is trivial but my Akabak computer is down for the moment.
Alright let me try that tonight with winisd. I am not familiar with akabak. Is there any extra sim you can do with akabak?
I'd first listen to the speakers of your choice to hear what they are doing. If you want to pursue a line array build a simple stereo set with two speakers first and listen.
In a (long enough) line array you tend to get the sound of the speaker you choose on steroids. So you better like what you're hearing from one or two of them.
I used one speaker in a simple box and used my old speakers as bass cabinets and crossed them at ~200 Hz as a mono speaker. Just to get a general feel of the mid and high frequency the speaker was able to give. It had to be just as good or better than my current speakers for me to continue the build I was planning.
Lucky for me that test worked out fine.
Keep in mind though that a floor to ceiling line array is a different animal than a short array. Lots of info about that on this forum if you look for it.
In a (long enough) line array you tend to get the sound of the speaker you choose on steroids. So you better like what you're hearing from one or two of them.
I used one speaker in a simple box and used my old speakers as bass cabinets and crossed them at ~200 Hz as a mono speaker. Just to get a general feel of the mid and high frequency the speaker was able to give. It had to be just as good or better than my current speakers for me to continue the build I was planning.
Lucky for me that test worked out fine.
Keep in mind though that a floor to ceiling line array is a different animal than a short array. Lots of info about that on this forum if you look for it.
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Yes. A single driver will reach 20 Hz the same way 25 will, it will just not play as loud before running out of gas. A better solution is to high pass the FR and add woofers if you fo that low. Every octave below the nominal cut-off increases excursion by 4.
dave
But with 25 drivers you cut the excursion of a single speaker in that array by no small amount either 😉.
I hardly ever see my cones move, yet I have bass response to 20 Hz. I can both hear and feel it. I have no regrets going for the line array solution, but I wouldn't build a smaller array than a floor to ceiling array without woofer support.
So I wanted to know if there exists a formula to calculate how many drivers with specific xmax are required to reach specific low frequency point.
i have a limitation of using 16 drives per channel. with 25 it could reach to 20hz, but i am dont know or how to calculate how much it could reach down with just 16 drivers (i guess 16 is not small!). so i will compromise with my low target freq. it need not be 20hz but 50-60hz is also just fine. if it goes below that...then its bonus 😛
It should work something like this. 2 drivers have 1/2 the excursion so 16 should give you 2 octaves.
dave
dave
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