The first one I made didn't know anything about stuffing...it sounded like run-away freight train (powerful, but very odd).
But got that straighten with a couple of strategically located 4" access holes and craft shop white filling.
But got that straighten with a couple of strategically located 4" access holes and craft shop white filling.
Hi,
...Depends on how you place the TL but in reality If I had designed the TL sub. I would place the terminus at the side of the driver front.
b🙂
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Hi Josephjcole,
Good work!
If you single fold the T-TQWT you should stuff..'your/this design'.. evenly(constant density) using a weight of ~ 0.8 lb damping material, but if you intend to add more folds:
Use lesser stuffing= ~0.6 lb and taper the density 'linear' towards the terminating end where the density is ~ half of what you started with.
Have a look at the profound effect when adding stuffing material:
Submitting a MJK simulation which you can study, i.e. an actual T-TQWT will inherit ~ the FR and Phase above ~80 Hz.
XO at ~90 Hz(LR2-LR4) if targeting a 80 Hz XO or use the Mains somewhat overlapping the sub (Sub XO set at ~80 Hz), I prefer the latter method.
b🙂
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bjorno, Josephjcole,
Two woofers would be better.
This one is next to a cinder block wall, the extension is very nice (amplifier barely gets warm even after playing all day).
posts #255 - 258
http://www.diyaudio.com/forums/subwoofers/203345-isobaric-less-then-20-a-26.html
Two woofers would be better.
This one is next to a cinder block wall, the extension is very nice (amplifier barely gets warm even after playing all day).
posts #255 - 258
http://www.diyaudio.com/forums/subwoofers/203345-isobaric-less-then-20-a-26.html
Thanks so much! Great information...I really appreciate it. I originally bought these with the intention of making small sealed subs to help even out room modes, but after seeing what they can do in a T-TQWT I'm pretty tempted. I would put them in my attic with the mouth firing down, one right above each speaker (4' from the top of my speakers, which are 4' tall). My only hesitation on building these is that I would like to have the stereo subs be able to be crossed slightly higher in frequency for more overlap to help deal with room modes (my mains reach down to 40Hz). I've seen you design T-TQWT's that could do 20-100Hz. Is that possible with this driver? or am I better off looking for a different driver if I want a slightly wider bandwidth?
I followed your thread pretty closely! I have no doubt more is always better😉, your T-TQWT's with four drivers each looked great. However two is probably all I can swing right now and I'm thinking that it might be better to have them in separate enclosure to help more with room modes.
Well yes only 2 drivers in a front-front build (or stack). Might be able to flip one of the woofers as suggested by Oliver.
Building a mirror image was easy, once there's a recipe.
Some say two subs in a room is tricky, I found that it didn't work here and ended placing them (2 sub boxes) only 5' apart.
Building a mirror image was easy, once there's a recipe.
Some say two subs in a room is tricky, I found that it didn't work here and ended placing them (2 sub boxes) only 5' apart.
Hi,
With~8 foot ceiling height and the subs above your mains, you're looking for trouble 😱 unless you XO the subs at or lower than ~30-40 Hz,i.e. IME infra-subs would work well below ~30-40 Hz.
Good integration may be achieved if your woofers in your main speaker and the 'stereo-subs are placed at the wall DBA(Double Bass Array) points and 'time-aligned' at the acoustic XO.
20.100? No problems 😀 :
b🙂
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bjorno,
Checking this out, 100 liter box; a single fold box T-TQWT box design might not be that bad:
We know a few things:
The ID of the box would need to be at least 11"- 12" wide.
How big would the mouth need to be?
How long would the center line need to be?
Checking this out, 100 liter box; a single fold box T-TQWT box design might not be that bad:
We know a few things:
The ID of the box would need to be at least 11"- 12" wide.
How big would the mouth need to be?
How long would the center line need to be?
Checking a bit more:
The 6.5" (4) are in 4.5cf boxes.
100 liters is 3.5cf (a bit smaller)
If the center line is very long (down to 18hz?), I don't see how it could be built.
The 6.5" (4) are in 4.5cf boxes.
100 liters is 3.5cf (a bit smaller)
If the center line is very long (down to 18hz?), I don't see how it could be built.
Easy Answer............
Thinking out loud......... 2 - 10" would double the box size?
200 liters, 7cf.
Now 7cf would give you some working room.
Thinking out loud......... 2 - 10" would double the box size?
200 liters, 7cf.
Now 7cf would give you some working room.
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E.G.
E.G. Using a box program....
13" Wide (11.5" ID)
23" Deep
52" Tall
Equals 7.23cf. (a little extra for bracing, etc).
What would be the center line?
E.G. Using a box program....
13" Wide (11.5" ID)
23" Deep
52" Tall
Equals 7.23cf. (a little extra for bracing, etc).
What would be the center line?
Have no idea..box program? for what? No Rookie guff box program can handle a TL or a T-TQWT and is totally useless whenever there is quarter-waves involved and tapered enclosures where the drivers/terminating ports are placed in offset.
I designed an TL using dual 8 Ohm drivers that would use an internal height of ~52":
b 🙂
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Apologizes bjorno, I only guessed at 52" as a starting point; it was only a rough idea if a box could be built with a 10.5" woofer (or 2).
I remember B1fantastic (sp) used woofer that were narrow on two sides, that would help with a box being to wide.
I remember B1fantastic (sp) used woofer that were narrow on two sides, that would help with a box being to wide.
I calculated with an internal width of 10.5" for the dual OD_T-TQWT in post#33 and also for #35.
Submitting: IMO:A better OD-TL than in post #35:
b🙂
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Very close to understanding this..........but not there yet.
Is this a good example?
Yves TL Subwoofer
bjorno, thank you for highlighting a few specs.
Is this a good example?
Yves TL Subwoofer
bjorno, thank you for highlighting a few specs.
Yes, Thats a good example. You can also move the terminus(port) to the driver side but this implies an extra fold as the driver would move down a bit and the new port location would be close to the driver front-side.
A TL is very forgiving when it comes to dimensioning: If the line length or CSA:s are off an inch or two,it wont matter as the exactly amount of stuffing material can be used to tune the TL for the target 'fb'.
b🙂
PS: My Internet Service Provider has a 50% duty-cycle since yesterday😱I might be slow on answering questions.
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