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Old 31st January 2012, 02:59 PM   #11
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I was initially looking at in isobaric design-but for different reasons; there was an old CRT above where the enclosure is being fitted and mounting the drivers mag2mag got rid of the stray gauss issue. There's now a nice new 3D LCD (I know, 3D will be gone again soon-seems to come round once a generation-but the missus wanted to make sure our 10month old doesn't feel deprived when she gets to school and everyone else has 3D!) that myself and my partner got each other for Christmas.

There's plenty of space for a ported enclosure, isobaric or not, that would give very good results, same for a sealed-but I'm interested in the enclosure design as much as the response and thought I'd have a go at cutting my teeth with horns and TQWT etc. I work in car audio so have designed plenty of sealed and vented enclosures-so the prospect of another doesn't really float my boat! Ok, I'm getting a lot of help with my design-but I'm hoping it's more of the "teach a man to fish and he can feed himself forever" scenario then the "give a man a fish and he can feed himself once".
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Old 31st January 2012, 03:01 PM   #12
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I was actually thinking of mounting the isobarik arrangement in the TL enclosure...
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Old 31st January 2012, 03:04 PM   #13
tb46 is offline tb46  United States
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Hi TheBaronGroog,

The attempt by pinkmouse was a tapped horn. The T-TQwT is not a horn, more like a tapped transmission line. By the way, did you see Post #7?

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Old 31st January 2012, 03:05 PM   #14
bjorno is offline bjorno  Sweden
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Quote:
Hi TheBaronGroog,..Is this what you're talking about (if bjorno doesn't substantially change the simulation, the volume will stay similar, should fit w/ less than 25")..Also, do you want the box to vent forward (as in the drawings so far), or sideways (which would be in the drawing from Post #3: straight down)?..
Hi Oliver,TheBaronGroog

Thank you for helping me out. IMO:You have the done a good work with TheBaronGroog's sub...So far I have not yet done any work..Gremlins are lurking in my computer making it very difficult to do a quick descent job.

b
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Old 31st January 2012, 03:19 PM   #15
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Quote:
Originally Posted by tb46 View Post
Hi TheBaronGroog,

Is this what you're talking about (if bjorno doesn't substantially change the simulation, the volume will stay similar, should fit w/ less than 25").

Also, do you want the box to vent forward (as in the drawings so far), or sideways (which would be in the drawing from Post #3: straight down)?

Regards,
Hi Oliver,

That looks spot on I'm not really too concerned with where the vent exits-front or side my 10month old will probably work out how to get her hand and various other goodies into it As it's being fitted into a bay window I'd guess it would benefit me to have the vent into the corner-but again side or front wouldn't make difference-would it?

For simplicity and lack of woodworking tools/skill I'd like to keep the vent as a slot.

Which of these does anyone think would work better:
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File Type: jpg port location.JPG (42.8 KB, 176 views)
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Old 31st January 2012, 03:25 PM   #16
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Originally Posted by tb46 View Post
Hi TheBaronGroog,

The attempt by pinkmouse was a tapped horn. The T-TQwT is not a horn, more like a tapped transmission line. By the way, did you see Post #7?

Regards,
Greg is fine if you can't be bothered with my username!

Yes, I saw post #7-looks like some of the derivations(abortions-no offence pinkmouse!) of Bjorno's design that I came up with while trying to adjust his design.

Differentiating between the various designs is proving quite entertaining/frustrating (depending on mood) is there a link anywhere that pictures the various designs for me to get my head round?


Quote:
Originally Posted by bjorno View Post
Hi Oliver,TheBaronGroog

Thank you for helping me out. IMO:You have the done a good work with TheBaronGroog's sub...So far I have not yet done any work..Gremlins are lurking in my computer making it very difficult to do a quick descent job.

b
Thank you both, and everyone else for your input-without it I'd be up a certain creek without a rowing impliment..
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Old 31st January 2012, 11:43 PM   #17
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Setting the mouth close to a solid surface, firing into a wall, would retune the design.
I'd go with the front firing since you won't be able to use a corner to aid in loading. see pic
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Last edited by revboden; 31st January 2012 at 11:46 PM.
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Old 1st February 2012, 12:51 AM   #18
tb46 is offline tb46  United States
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Hi Y'all,

I second the motion, point the vent towards the room. Bye the way the round port may actually be easier on the woodworking skills than the slot (it doesn't matter much in the design/drawing); anyway, I'll be taking a look at the drawing tonight.

Regards,
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Old 1st February 2012, 05:45 AM   #19
tb46 is offline tb46  United States
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Hi,

Here is an attempt of fitting bjorno's design into your room requirements:

Regards,
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Old 1st February 2012, 12:15 PM   #20
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Quote:
Originally Posted by pinkmouse View Post
I was actually thinking of mounting the isobarik arrangement in the TL enclosure...
That was what my 1st attempted "design" was! Thoughts on my isobaric "TL/Horn"box design:
What benefit would there be in the isobaric mounting-I know the benefits of isobaric mounting for sealed/vented/bandpass boxes, but have no knowledge in it's benefits for TLs/horns and all their derivatives

Quote:
Originally Posted by revboden View Post
Setting the mouth close to a solid surface, firing into a wall, would retune the design.
I'd go with the front firing since you won't be able to use a corner to aid in loading. see pic
Quote:
Originally Posted by tb46 View Post
Hi Y'all,

I second the motion, point the vent towards the room. Bye the way the round port may actually be easier on the woodworking skills than the slot (it doesn't matter much in the design/drawing); anyway, I'll be taking a look at the drawing tonight.

Regards,
Looks like that's the best solution-will need to make a grill to keep the little fingers out!

Thanks Oliver, slot is one bit of wood cut in half-round = jigsaw trying to cut a perfect circle and I'm no Da Vinci

That looks spot on, what do you use to design it?

With the void at S4 could the port be moved to that end/further down for any gain in output/extension? Also the small section voided in at S1-could that be removed to any gain? Aprt from the gross and S* dimensions how do I work out the figures for the values 1-11 on the unfolded horn so I can transpose them to the build?

Also any comment on what the output would be like if I'd gone ahead with this, it's Bjorno's unfolded horn, "folded" by me:http://www.diyaudio.com/forums/attac...p-plans1.2.jpg
What enclosure would it actually be? I'm still trying to work out what's what in terms of designs-any useful links?

I quickly measured the driver dimensions, look like they should fit fine-though was hoping to invert one driver-but if there's no space there's no space:
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File Type: jpg b139dimensions.JPG (23.1 KB, 139 views)

Last edited by TheBaronGroog; 1st February 2012 at 12:19 PM.
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