How to build a box for 2 12" woofers (with round port) tuned to 20 hz ??
Any one can help please, thx in advance 😍
Any one can help please, thx in advance 😍
Get the T/S parameters, input those in WinISD or similar tool, and you get the suggested size for the box and port size and lenght.
I heard about this app but honestly i am a newbie and this app is pretty complicated so i need someone to give me the dimensions so i can build the perfect box
box simulations are dependent on the parameters of the driver(s) you use. no one can simulate anything to help you w/o the driver information.
if you just want something generic, 6ft^3, 2 - 4" ports 26.25" long
if you just want something generic, 6ft^3, 2 - 4" ports 26.25" long
What drivers are they? If car subs, you might find the details you need are not published. If winisd doesn't already have them listed, you need to add them to your own drivers list. Along with all that data from the manufacturer.
I'm in the middle of a build using jbl 1214 subs. One in a box around 95 liters will be 3db down at 22hz, but flat down to 30hz and only 1db down at 25hz. It uses a 100mm port, 360mm long. Give or take a few mm as I'm not actually looking. That's a 23.95hz port.
Interestingly I pulled out my magazine cover bass test cd's to find no tones below 30hz on offer. A tone it produced as loud as any other in my listening environment. It seems in boy racer land, 20hz doesn't really matter. It's for pipe organs.
I'm in the middle of a build using jbl 1214 subs. One in a box around 95 liters will be 3db down at 22hz, but flat down to 30hz and only 1db down at 25hz. It uses a 100mm port, 360mm long. Give or take a few mm as I'm not actually looking. That's a 23.95hz port.
Interestingly I pulled out my magazine cover bass test cd's to find no tones below 30hz on offer. A tone it produced as loud as any other in my listening environment. It seems in boy racer land, 20hz doesn't really matter. It's for pipe organs.
If it's for car audio, my current design rules are as follows:
1. Make sure that you have EQ available with bands around 1.5*Fb, Fb and 0.6*Fb, e.g. 50 Hz, 31.5 Hz, 20 Hz.
2. Design the box so it's vented at Fb. If you don't know what Fb to use, choose 30~32 Hz. 1.5 cu.ft. to 2.0 cu.ft. should be fine for most 12" drivers.
3. Fix the in-car response using the EQ. You'd want to use the lowest band to cut all frequencies below Fb, and the other two bands to flatten the response of the subwoofer down to Fb. Note: You should never have to BOOST the 1.6*Fb band. Cut the response at Fb instead.
1. Make sure that you have EQ available with bands around 1.5*Fb, Fb and 0.6*Fb, e.g. 50 Hz, 31.5 Hz, 20 Hz.
2. Design the box so it's vented at Fb. If you don't know what Fb to use, choose 30~32 Hz. 1.5 cu.ft. to 2.0 cu.ft. should be fine for most 12" drivers.
3. Fix the in-car response using the EQ. You'd want to use the lowest band to cut all frequencies below Fb, and the other two bands to flatten the response of the subwoofer down to Fb. Note: You should never have to BOOST the 1.6*Fb band. Cut the response at Fb instead.
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