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200L 2x18 Subwoofer plans 32hz?

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Doctajay313 View Drop Down
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    Posted: 29 October 2018 at 6:13am
Anyone have plans for a vented 2x18 direct radiating subwoofer enclosure that's 200 liters tuned to 32hz?
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 7:50am
Why do you need a plan for that. Calculate it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 11:31am
Helpful. Confused


Try winISD suberwoofer design software. 
Lots of help online.
Once you come up with a design post your results and questions here and im sure someone will help you fine-tune it / guide you too a good design.





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MarjanM View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 12:30pm
Helpfull yeah. This was beaten to death ehre for who knows how many times. People should use the search function before asking the same question again and again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jo bg Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 12:42pm
hi
if it is for your 18 tbw100 from the other thread, beware that the 200 liters sim from b&c was for one woofer, not two. if you want to make it a double you need to double also volume and ports.


from that same thread somebody suggested the 18sound double 18 enclosure, you will find plans on their site, there is also a wonderfull build on this forum from few weeks ago with added bracing you should copy.
you probably will not find a better ready made plan.
tuning should be around the same, maybe a couple hertz lower .

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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 12:51pm
Originally posted by Doctajay313 Doctajay313 wrote:

Anyone have plans for a vented 2x18 direct radiating subwoofer enclosure that's 200 liters tuned to 32hz?

Unlikely as 200l is pretty small for a 2x18 - if you're wanting to stretch them down low it's not unusual to see 200l per driver. The 18Sound design for example works out at around 365l net of the drivers, ports etc.
A couple of things you'll need to be aware of when reducing box size - first, the response curve will drop down around tuning, meaning you need more EQ to boost it back up to flat and second, the length of port you need to achieve a given tuning frequency gets ever longer, the smaller the box is.
It can easily get to the point where the port has to be bent round a corner to even fit inside the box, complicating the design and build.

HTH,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 1:22pm
Originally posted by MarjanM MarjanM wrote:

Helpfull yeah. This was beaten to death ehre for who knows how many times. People should use the search function before asking the same question again and again.


This is what happens in forums, that don't have FAQ section, or newbies can post straight away.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Meat Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 6:55pm
Originally posted by DMorison DMorison wrote:

Originally posted by Doctajay313 Doctajay313 wrote:

Anyone have plans for a vented 2x18 direct radiating subwoofer enclosure that's 200 liters tuned to 32hz?

Unlikely as 200l is pretty small for a 2x18 - if you're wanting to stretch them down low it's not unusual to see 200l per driver. The 18Sound design for example works out at around 365l net of the drivers, ports etc.
A couple of things you'll need to be aware of when reducing box size - first, the response curve will drop down around tuning, meaning you need more EQ to boost it back up to flat and second, the length of port you need to achieve a given tuning frequency gets ever longer, the smaller the box is.
It can easily get to the point where the port has to be bent round a corner to even fit inside the box, complicating the design and build.

HTH,
David.

Yes, 200l is very small for a 218. It's not crazy though, for the right woofer this would be something like a BP6 alignment.

I've looked at similar designs myself and it does look like a bit of a trick to get right (especially so with high power woofers) as you run out of front space so you have to make it shallow but then the port needs to be long so the cab ends up too complex to be justified. Raising the tuning improved things but then it wouldn't do what I wanted in terms of low frequencies.
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Doctajay313 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Doctajay313 Quote  Post ReplyReply Direct Link To This Post Posted: 31 October 2018 at 3:19am
I ment a 1x18 box plan
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Greg32 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2018 at 8:08am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB67 Quote  Post ReplyReply Direct Link To This Post Posted: 23 November 2018 at 10:20am
Marjan is right,  there's loads of stuff on this forum on this subject so a search should yield not just plans but opinions on how each one sounds.  Might take a few hours reading though.

For off the shelf plans:
the b&c one above, 
Google "fane 200l plan"
Look at the 18 sound website for a huge array of enclosures including 18 inch subs. Why not build half their double?!

If you're willing to learn a fairly easy bit of software you'll soon understand what the changes in volume and port length and size do to the tuning of the box and the output. This is WinISD as mentioned above. It's then not too hard to design your own.  If you just want to build and don't care just build the b&c plan


Edited by JonB67 - 23 November 2018 at 10:20am
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