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Old 24th September 2011, 02:25 PM   #11
bjorno is offline bjorno  Sweden
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Originally Posted by mclsound View Post
I am having trouble reading the designs.Which is best for music and are they all based on 5.8(ish) volume?
Hi John,

All the internal volumes for the simulations is noted as the 'System Volume'.

IMO the box with system volume of~392L is the one to choose if targeting a standalone sub.

5.8 cubic foot = ~164L is definitively not suited for an BR or even a closed design(PA use not considered) as can be seen in the simulations.

I recommend a closed design (minimum volume= ~200L= ~7.2 cu.ft; way better is 300L=~10.6 cu.ft) if the intension is to build side firing main speakers.

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Old 24th September 2011, 02:37 PM   #12
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Hi Bjorno
so 7.2-10.6ft2/driver, sealed for side firing,crossed around 40-50hz@24db....correct?
thanks John
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Old 3rd October 2011, 08:02 AM   #13
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Join Date: Sep 2007
10.6ft2/driver is some serious cabinetry.All BB at 1.75inches thick and 2.75 baffle.
I have been given quite a deal on 4-NS18 and can run off a Krell KSA300s(1200w/ch/2ohms) or a FPB600c(2400w/ch/2ohms)..
Would you be saying to put two NS18 into a 21.2ft/2 for side firing.This is a massive box for sure.
thanks John
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Old 4th October 2011, 01:09 PM   #14
sreten is offline sreten  United Kingdom
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FWIW its hard to describe 300L per driver as way better than using 200L.

I don't like seeing Vbox approaching Vas of the driver. It means the air in
the box is not linearising variations in suspension stiffness as much as it
might, and the higher Qbox of smaller boxes can sound somewhat cleaner.

If size is an issue any volume down from 300L to 200L would be OK.

200L * optimally stuffed (read up on this) would be a good choice.

rgds, sreten.

* Increases in apparent box volume of 20% to 35% material dependent.

Last edited by sreten; 4th October 2011 at 01:19 PM.
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Old 4th October 2011, 11:22 PM   #15
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thanks Sreten
200-250L stuffed is a little smaller and about as big as I would want to go really.I can get lots of Dacron.
Thanks john
thanks John
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Old 1st March 2013, 12:08 PM   #16
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4 aura NS -18's in the house...finally.Time to get some serious designs.I will try to keep 2 of them with the mains and 2 seperate around the room.
thanks John
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Old 20th April 2014, 08:31 AM   #17
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Internal dimensions are 20w x 32d x 26h=9.62ft3 (298L)
Just cut all the mdf this weekend. ..2 inch thick. .Fn gonna be heavy
Now I need a slot vent and tunning
thanks John
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