Hello everybody
I design a new MLTL bookshelf speaker for tangband W3-881SJF.
The W3-881SJF design with 3" p.p. cone, the piston area is smaller than W4-1320.
Cross section area in W3-881SJF MLTL cabinet will smaller W4-1320 MLTL cabinet, that means smaller speaker enclosure.
That's good to me, I can saving more desktop space. 😀
Here is the simulate SPL results, this enclosure extension bass response close to 60hz :
Enclosure 2D structure:
Enclosure 3D structure:
Speaker 3D plane sketch file : Plane
MJK worksheet analysis result : PDF(2013/08/02 updated, fix geometry and port offset parameter.)
I found a local store in Taiwan that provides enclosure manufacture and sells some models of Tang Band driver.
This is really helping me to build this project, so I ask their help to build this enclosure.
I use 15mm thick Birch plywood to build this enclosure, here are some build picture:
Cnc cutting with joint.
I love Birch plywood. 😀
Port output.
Driver placement.
W3-881SJF FIT!!! 😀
W3-315E FIT!!! 😀
Finish!
Compare with W4-1320 MLTL, the new one is smaller.
Thank you read this thread and reply.
Hope you will like it. 😀
I design a new MLTL bookshelf speaker for tangband W3-881SJF.
The W3-881SJF design with 3" p.p. cone, the piston area is smaller than W4-1320.
Cross section area in W3-881SJF MLTL cabinet will smaller W4-1320 MLTL cabinet, that means smaller speaker enclosure.
That's good to me, I can saving more desktop space. 😀
Here is the simulate SPL results, this enclosure extension bass response close to 60hz :
Enclosure 2D structure:
Enclosure 3D structure:
Speaker 3D plane sketch file : Plane
MJK worksheet analysis result : PDF(2013/08/02 updated, fix geometry and port offset parameter.)
I found a local store in Taiwan that provides enclosure manufacture and sells some models of Tang Band driver.
This is really helping me to build this project, so I ask their help to build this enclosure.
I use 15mm thick Birch plywood to build this enclosure, here are some build picture:
Cnc cutting with joint.
I love Birch plywood. 😀
Port output.
Driver placement.
W3-881SJF FIT!!! 😀
W3-315E FIT!!! 😀
Finish!
Compare with W4-1320 MLTL, the new one is smaller.
Thank you read this thread and reply.
Hope you will like it. 😀
Last edited:
Nice design and nice build! Amazing what a shop with CNC can do. This reminds me of a folded Tabaq which is tuned lower and reaches 55 Hz if I recall. How does it sound?
Congratulations.
Congratulations.
Hi xrk971Nice design and nice build! Amazing what a shop with CNC can do. This reminds me of a folded Tabaq which is tuned lower and reaches 55 Hz if I recall. How does it sound?
Congratulations.
I tried folded TABAQ three years ago in this thread. It's too big for my desktop. So I built another TABAQ modified speaker in this thread, and tuned to 40hz.
The w4-1320sb mltl design works great until I change my new PC monitor 🙁.
Compare w3-881sjf mltl build with w4-1320sb mltl which sound is better :
1. Bass dynamic : w3-881sjf
-> I'm not so sure the which condition cause, because this two design use different material, different fiber fill and w3-881sjf use faster "system group delay" setting.
2. Bass deep : w4-1320sb
-> w4-1320sb mltl can reach 40hz.
3. Driver sound : w4-1320sb
-> This two drivers works great, but in personal preference, w4-1320sb is a little better than w3-881sjf.
KLBIrd said:
In MJK worksheet, he use Darcon holofill fiber II to build it, so the Darcon holofill fiber II is the best fill material for the project.
But I don't know where to buy same fiber in Taiwan. So I use glass fiber cotton for this build.
yljhao
Enclosure dimensions
What is the with of the enclosure?
I have looked for the width of the enclosure but can't find it. I imagine that if I weren't so simple minded I would be able to extrapolate the width from the Math CAD work sheet you supplied, but this is beyond my understanding at present.
Thanks,
Roger
What is the with of the enclosure?
I have looked for the width of the enclosure but can't find it. I imagine that if I weren't so simple minded I would be able to extrapolate the width from the Math CAD work sheet you supplied, but this is beyond my understanding at present.
Thanks,
Roger
I estimated the front panel less sides panels width to be 5 inches, or 127 mm. A few mm each way won't affect the performance.
Hi Roger:
I forgot posting the width information of this enclosure. The front panel width is 100mm, thickness of all panel is 15mm.
An externally hosted image should be here but it was not working when we last tested it.
If there are more information you need, please let me know. 🙂
yljhao
Hi,
Maybe something is wrong in the pdf, look at port air velocity ?
Maybe value of port radius.
Phil
Maybe something is wrong in the pdf, look at port air velocity ?
Maybe value of port radius.
Phil
Thanks for the update.
Your design is intriguing. The enclosure is elegant and could be duplicated with table saw and router. These small speakers are quite economical and would give me the opportunity to gain experience with another type of enclosure. Thanks for your effort and the addition to new possibilities.
I have a little file started on your design and may well build it.
Roger
Hi Phil:
Yes is the port radius problem.
In my design I didn't use traditional round port as my mass loaded port, I use rectangle port for it.
I modified the "Pre Formated Geometry and Stuffing Location Input" section as same as my enclosure is. So I didn't notice MJK use port radius to calculate Port Air Velocity.
Here are two PDF files.
1. Use Port cross section area to calculate round port radius. Click me.
2. Same as file 1, and fix port length bias when using round port as mass loaded port. Click me.
rka said:
Hi Roger:
I'm glad you like this design, thank you. 😀😀😀
yljhao
Hi Phil:
Thank you.
CNC's owner is a friend of mine, he start a company to help customer build their speaker cabinet.
yljhao
Agree..IMO..This design would come out better if modelled in a TL Sections program..
b🙂
Attachments
Hi bjorno
Thanks for your help and simulation.
Here I made a mistake 🙁 , I forget correct the parameter in my old simulation worksheet, so the the parameter you use isn't fit the enclosure geometry.
Hope you don't mind it. 😱
The way I use worksheet is that I directly modified the value of "Pre Formated Geometry and Stuffing Location Input" section,
so the parameter in "Enclosure Geometry Definition : Model of Internal Air Volume" section is useless parameter for the simulation in my origional release sheet.
The correct version of the "Enclosure Geometry Definition : Model of Internal Air Volume" section parameter I've update in the newer sheet.
I simulate the same enclosure geometry by using TL Sections worksheet.
The TL Sections worksheet didn't simulate the button end of enclosure section, the SPL response will higher than MLTL worksheet about 10hz.
That's why I use MLTL worksheet to simulate this design.
yljhao
I know this is an old thread, but I am very interested in this design. Do you think the dimensions could remain the same if using Fostex 3 inch drivers?
My first speaker build! A resounding success!
Hello there. Thanks very much for these plans. I used 1/8" walnut ply sandwiched with 1/4" mdf for the main panels. Everything else 3/4" mdf. I spent all afternoon on the glue up of the 1st speaker... patience and good clamp placement. Once the glue began to set I lost my patience and mounted the driver and carried it to my hook up.
The sound coming from this speaker is amazing! The baffle performs outstandingly. I am extremely pleased. Thank you so very much!
I'll post pictures if anyone is interested. I know this is an old thread. But these have got to be the best sounding bookshelf speakers in existence.
Steve-O
Hello there. Thanks very much for these plans. I used 1/8" walnut ply sandwiched with 1/4" mdf for the main panels. Everything else 3/4" mdf. I spent all afternoon on the glue up of the 1st speaker... patience and good clamp placement. Once the glue began to set I lost my patience and mounted the driver and carried it to my hook up.
The sound coming from this speaker is amazing! The baffle performs outstandingly. I am extremely pleased. Thank you so very much!
I'll post pictures if anyone is interested. I know this is an old thread. But these have got to be the best sounding bookshelf speakers in existence.
Steve-O
