Cabinet volume question / woofers

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tone?

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Joined 2022
#1
Ok this might be a dumb question but here goes.

when constructing a cabinet and using two woofers do you follow the recommendations from the woofer specs which for example might say 30 liters?
So for using two woofers you would have to use at least a cabinet with 60 liters of volume ?

is it also dependent on the crossover?
what cabinet size would be needed for let’s say a
2nd order
3rd order
4th order?

much appreciated !
 
#2
Yes, if you double the woofers, you need to double the net box volume to get that same bass roll-off/alignment as with a single woofer and so on.
You can use two (or more) woofers in a box which is made for a single woofer but this way the bass alignment will change.
 
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#5
For example as it says here. Volume in liters. VAS
just grabbed that as an example.

38031F74-038C-4854-B519-2A49D029F025.png
 
#10
Yes, try a modeling program not a simple calculator. I like Unibox but it needs Excel. There are an almost infinite number of box alignments one can create. The one that is correct is the one that suits your purposes best. Typical box recommendations are for a maximally flat alignment but it's quite common to deviate from that either in terms of box volume (either way but usually smaller) or in terms of the box tuning, Fb.

Except for any added series resistance which can make the tiniest little difference, box alignments do not depend on the xo.
 
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#20
Within a speaker-box simulator program one can select a single or multiples of woofers. With a ported enclosure...all other parameters fixed, a doubling of woofers requires a doubling of internal volume.
Now, given the flexibility of a computer simulation, one can "tweak" some values to tailor the performance to your liking. The values of your pair of drivers we can't change obviously...but we can vary the tuning frequency of the box itself...and as we "goof around" by changing this frequency, or "Fb" , in hertz, we will have to change the box volume and size of the port AND the length. These changes can be observed graphically on the screen, representing changes for good or ill. And yes, one can do these changes to eck out a deeper bass performance...but watch the enclosure volumes, they can get really out of hand & rather huge in size.
I have found WinISD in its first, early edition extremely easy to learn & see your changes...the later versions of WinISD for me, got too complicated & are not "user friendly".
A dual pair of woofers can be advantageous in a type of speaker called The D'Appolito alignment....questions?...I'm all ears.






---------------------------------------------------------------------------------------------------------------------------------------------Rick...
 
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