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Woofer Box Design
Woofer Box Design
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Old 25th March 2020, 01:52 PM   #1
rohit055 is offline rohit055  India
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Default Woofer Box Design

Hello Everyone
This is my first question m asking here.M new here, So sorry if i forget to clk something or mention something or whtever.

I have made a 2.1 audio system using 2- 5inch woofers as mid way speakers and 6inch woofer as woofer. Everything is going good but the woofer enclosure i made isnt producing tht much base, it just producing "punch" type bass not deep bass. The bass is just coming from the woofer not from the vent and covering the vent didnt effect tht much.(See the enclosure design (i) in attachments.

I doesnt like punch bass, i like the "echo" type of bass (or deep base i dont sure wht to call tht type of bass).So i searched a lot and i found that to create a deep base i have to add larger path difference between sound from front side and back side, so i m thinking of a different enclosure (see the ii design).
I didnt create the enclosure yet coz m not sure if it work or not (thts my problem).M thinking to use pvc pipes in "curly fashion" to increase the path difference. So i want to know will this work or have to add something more?? Do i have to fill the downward space with something??Wht should i do now??
Btw in design ii i showed tht the path is like "S" (coz i showed in 2D) but actually its is more likely to "spring shape"(sqaure spring or whtever).

And my woofer box vibrates too much thts why sound get distorted too much, wht should i do to stop it or decrease it, currently m using heavy weight to stop its vibrations.

Again sorry if i forgot something,Now m waiting for the answers
Attached Images
File Type: jpg i design.jpg (24.1 KB, 127 views)
File Type: jpg ii design.jpg (28.8 KB, 125 views)
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Old 25th March 2020, 03:42 PM   #2
Inductor is offline Inductor  Portugal
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Hi Louise, it's important to know the model of the driver to have access to it's T/S (Thiele/Small) parameters to design an enclosure that works. Also the sattelites must reproduce down to the frequency of the woofers or sub.
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Old 25th March 2020, 04:17 PM   #3
rohit055 is offline rohit055  India
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Thank you for ur fast response
Actually i bought it from a local store, and the shopkeeper doesnt give me any information about the woofer nor any papers about it, The woofers r cheap local woofers. So now wht can i do, I think its average woofer nor high end.
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Old 25th March 2020, 07:06 PM   #4
zerokelvin99 is offline zerokelvin99  United Kingdom
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Take some photos of the box (including inside) and the speaker driver (front and back). May help a little.

It's unfortunately unlikely that making the port arbitrarily longer (as you proposed) will help the sound.
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Old 26th March 2020, 05:12 PM   #5
rohit055 is offline rohit055  India
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Quote:
Originally Posted by zerokelvin99 View Post
Take some photos of the box (including inside) and the speaker driver (front and back). May help a little.

It's unfortunately unlikely that making the port arbitrarily longer (as you proposed) will help the sound.
Ok i will upload its pic after i opened the box.
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Old 26th March 2020, 06:58 PM   #6
Inductor is offline Inductor  Portugal
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If you are into the art (of DIY building speakers) you should be able to measure them ( for the T/S parameters). Link to PE DATS V3 and software
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Old 27th March 2020, 08:22 AM   #7
dannyjmf is offline dannyjmf  Malaysia
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Quote:
Originally Posted by rohit055 View Post
Hello Everyone
This is my first question m asking here.M new here, So sorry if i forget to clk something or mention something or whtever.

I have made a 2.1 audio system using 2- 5inch woofers as mid way speakers and 6inch woofer as woofer. Everything is going good but the woofer enclosure i made isnt producing tht much base, it just producing "punch" type bass not deep bass. The bass is just coming from the woofer not from the vent and covering the vent didnt effect tht much.(See the enclosure design (i) in attachments.

I doesnt like punch bass, i like the "echo" type of bass (or deep base i dont sure wht to call tht type of bass).So i searched a lot and i found that to create a deep base i have to add larger path difference between sound from front side and back side, so i m thinking of a different enclosure (see the ii design).
I didnt create the enclosure yet coz m not sure if it work or not (thts my problem).M thinking to use pvc pipes in "curly fashion" to increase the path difference. So i want to know will this work or have to add something more?? Do i have to fill the downward space with something??Wht should i do now??
Btw in design ii i showed tht the path is like "S" (coz i showed in 2D) but actually its is more likely to "spring shape"(sqaure spring or whtever).

And my woofer box vibrates too much thts why sound get distorted too much, wht should i do to stop it or decrease it, currently m using heavy weight to stop its vibrations.

Again sorry if i forgot something,Now m waiting for the answers
As mentioned in the previous replies ... obtaining the T/S parameters is the first thing you need to do ... at least do your best to figure out where is the Free air resonance of the woofer and the stiffness of the woofer cone ... if the speaker has a big surround roll, large diameter voice coil and stiff suspension then it probably has medium Air Mass compliance(Vas) on the other hand lighter cone woofer will have higher (Vas) and will have higher efficiency than the former. Stiffer cone woofers will tend to have lower Fs. Post a few photos of your woofer here so we can have an idea what parameters to expect at least

At the very least before you start to build an enclosure, get a speaker modeling software first such as WinISD ... that certainly helps alot in Finding the Box tuning frequencies for Sealed, Ported, Bandpass enclosures. As you mentioned before your preference is towards low deep bass, your ports were mentioned 1.5inches which is too small for low bass with a 6incher. You might run into troubles with port noises and output compression of the port which is something to avoid at all cost. Start with something at least 3inch port as a starting point.

For the Vibration issue, the box might have lack sufficient bracing across the large panels or the panels used might be not enough of thickness. Add in some bracing to the large panels to curb these problems. Some Aucostic Damping materials will also help here and make sure the Damping materials dont block the port exits

Post some photos of the box too ... more detail will be easier for us to help up

good luck
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Old Yesterday, 01:28 PM   #8
rohit055 is offline rohit055  India
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Quote:
Originally Posted by dannyjmf View Post
As mentioned in the previous replies ... obtaining the T/S parameters is the first thing you need to do ... at least do your best to figure out where is the Free air resonance of the woofer and the stiffness of the woofer cone ... if the speaker has a big surround roll, large diameter voice coil and stiff suspension then it probably has medium Air Mass compliance(Vas) on the other hand lighter cone woofer will have higher (Vas) and will have higher efficiency than the former. Stiffer cone woofers will tend to have lower Fs. Post a few photos of your woofer here so we can have an idea what parameters to expect at least

At the very least before you start to build an enclosure, get a speaker modeling software first such as WinISD ... that certainly helps alot in Finding the Box tuning frequencies for Sealed, Ported, Bandpass enclosures. As you mentioned before your preference is towards low deep bass, your ports were mentioned 1.5inches which is too small for low bass with a 6incher. You might run into troubles with port noises and output compression of the port which is something to avoid at all cost. Start with something at least 3inch port as a starting point.

For the Vibration issue, the box might have lack sufficient bracing across the large panels or the panels used might be not enough of thickness. Add in some bracing to the large panels to curb these problems. Some Aucostic Damping materials will also help here and make sure the Damping materials dont block the port exits

Post some photos of the box too ... more detail will be easier for us to help up

good luck
Here are my speaker pictures, It says it hv 4 ohms Impedance (i checked it too). I tried to find Fs of my speaker but i dint get exact value (around 40 to 45 hz). The cone is surely stiff coz i hv another 5 and 4 inch woofer and their cone are very easy to move but for this woofer its a little bit harder.
Attached Images
File Type: jpg New Doc 2020-03-28 13.32.24_1.jpg (114.6 KB, 38 views)
File Type: jpg New Doc 2020-03-28 13.32.24_2.jpg (117.8 KB, 37 views)
File Type: jpg New Doc 2020-03-28 13.32.24_3.jpg (140.9 KB, 36 views)
File Type: jpg New Doc 2020-03-28 13.32.24_4.jpg (171.3 KB, 13 views)
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Old Today, 02:56 AM   #9
dannyjmf is offline dannyjmf  Malaysia
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Quote:
Originally Posted by rohit055 View Post
Here are my speaker pictures, It says it hv 4 ohms Impedance (i checked it too). I tried to find Fs of my speaker but i dint get exact value (around 40 to 45 hz). The cone is surely stiff coz i hv another 5 and 4 inch woofer and their cone are very easy to move but for this woofer its a little bit harder.
Ok i need the dimension of the box and also the port length and port diameter ... so i can roughly figure out what is the box tuning and the likely outcome it is ...
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