Hi, i am new here and new to making speakers though i've worked as a producer mixing engineer for over 10 years.
Now i have decided to design a small pair of speakers based on the Tang band W5-2143 . I've calculated everything on WinISD to get a 9,3liters box with a tuned frequency of 57hz and a vented port of 20x112x230mm.
The problem is that the speaker behaves the exact same way than closed and when i measure the inside of the vent i am getting a boost at around 100hz and not close to the "tuned frequency of 57hz"
The vent is places in the left side of the speaker at the bottom.
Now the box is a little odd because i want it attached like a frame on a wall :
interior dimensions are 262x262x150mm and i am using 19mm mdf which makes it 300x300x186mm
Anyone has any light to shine?
My next try will be to do a round vent. see where that takes me...
Thanks
Manu
Now i have decided to design a small pair of speakers based on the Tang band W5-2143 . I've calculated everything on WinISD to get a 9,3liters box with a tuned frequency of 57hz and a vented port of 20x112x230mm.
The problem is that the speaker behaves the exact same way than closed and when i measure the inside of the vent i am getting a boost at around 100hz and not close to the "tuned frequency of 57hz"
The vent is places in the left side of the speaker at the bottom.
Now the box is a little odd because i want it attached like a frame on a wall :
interior dimensions are 262x262x150mm and i am using 19mm mdf which makes it 300x300x186mm
Anyone has any light to shine?
My next try will be to do a round vent. see where that takes me...
Thanks
Manu
the cabinet is to small, you need 18L vented for this response to have the best response i think. In this small cabinet the response goes down at 74.5Hz as the cabinet is too small for this driver. A round vent won't change it, you really need to double the cabinet size.
While 9.3 litre is on the small side, it can be made to work.
Looking at the sims i did 14 litres is the alignment i saved.
Extention in the small box will be F10 at about 50 Hz. A more resistive vent would be smewhat helpful, but that brings less bass (in the 100 Hz range given the sim)
dave
Looking at the sims i did 14 litres is the alignment i saved.
Extention in the small box will be F10 at about 50 Hz. A more resistive vent would be smewhat helpful, but that brings less bass (in the 100 Hz range given the sim)
dave
Thank you guys,
here is the response i am getting at listening position with and without the vent (in orange). I can clearly see that the vent isn't working properly.
I am trying to understand what you said Planet10 about this : "Extention in the small box will be F10 at about 50 Hz" what does it mean?
Thanks Waxx for your input, you are right that a bigger box will work but i believe i should be able to extend the bass response regardless? Or How did you conclude that the cabinet is too small for this driver. How is that calculated? I've seen smaller speakers vented deliver much more bass.
Thanks for your help, i'm trying to make this work 🙂
Manu
here is the response i am getting at listening position with and without the vent (in orange). I can clearly see that the vent isn't working properly.
I am trying to understand what you said Planet10 about this : "Extention in the small box will be F10 at about 50 Hz" what does it mean?
Thanks Waxx for your input, you are right that a bigger box will work but i believe i should be able to extend the bass response regardless? Or How did you conclude that the cabinet is too small for this driver. How is that calculated? I've seen smaller speakers vented deliver much more bass.
Thanks for your help, i'm trying to make this work 🙂
Manu
Good question, everything i glued but i have the front baffle screwed and the vent so i can work on it... it seems to be fully sealed but now you got me wondering...
Right, so i am pretty sure it is. Everything it glued except the front that i can remove to do vent adjustments and the vent as well which are both screwed. How can i make sure it's sealed, cause as this is a prototype i am not ready to seal the inside corners and all...
Manu
Manu
With the front just screwed on do you have a proper gasket, otherwise it is likely leaking.
dave
dave
Edit -Dave beat me to it. 😉
Try to put some weatherproof neoprene tape, blu-tac or thin cork as a gasket to prevent pressure bleeds.
Are you able to take an impedance sweep? That will in this case likely show up any issues faster than an FR plot.
Try to put some weatherproof neoprene tape, blu-tac or thin cork as a gasket to prevent pressure bleeds.
Are you able to take an impedance sweep? That will in this case likely show up any issues faster than an FR plot.
Alright guys, ill get some neoprene tape tomorrow for the hardware store, might be the issue there.
What do i need to do an impedance sweep? i am running the REW, i built a quick omni measuring mic, so i can keep track of my steps.
Maybe i can build whats needed for the sweep?
Manu
What do i need to do an impedance sweep? i am running the REW, i built a quick omni measuring mic, so i can keep track of my steps.
Maybe i can build whats needed for the sweep?
Manu
Thank you guys, the neoprene tape and blue tac did the trick... I was having a leaky box...
Now the bass is here and I am seeing the frequency boost in the vent where its supposed to be... I can now work on tuning the vent 🙂
Now the bass is here and I am seeing the frequency boost in the vent where its supposed to be... I can now work on tuning the vent 🙂
Thank you guys for all the help,
The speakers are finished and they sound really good considering the requirements. They will end up on the wall so i did the vent on the side.
I will measure them when i have a chance outside to get a cleaner curve
Manu
The speakers are finished and they sound really good considering the requirements. They will end up on the wall so i did the vent on the side.
I will measure them when i have a chance outside to get a cleaner curve
Manu