Hello,
I want to build a 1x12 cab for my jensen jet tornado 100, i d like to use the tl806 plan but i know that a ported cab must be carefully planned.
There is a program to calculate the cabinet volume and vent area, this one http://www.linearteam.org/
I don t have a pc and i was wondering if any of you already used this program.
Here the speaker specs
I did, i also found an online calculator, and here is the result
I understand i can now come out with the measures of the cabinet to match the volume. What i don t understand is the vent, in the result it is shown as a sort of pipe, while on the tl806 there are three chambers underneath the speaker.
Mikante wrote: ↑Sat Jun 07, 2025 1:08 am
Yes, exactly, how can i calculate the size of the shelf port?
The diameter of the vent is 4 inches in the drawing.
It might be time to purchase speaker cab design software.
Tube junkie that aspires to become a tri-state bidirectional buss driver.
It is a one time project, i m not going to buy a dedicated program for that.
I will build the cabinet according to the cabinet volume suggested by the free program and adjust the vent on the going.
I don t need to tune the cabinet to 50hz, the speaker doesn t go that low. The tl806 cab is tuned around 70hz with the vent fully opened which is exactly how far my speaker goes.
the idea behind the 3-component shelf port in the EV TL series cabs was that you could install a port cover in the middle (across the two braces) to reduce the port area and change the port tuning to change the cab's frequency response. The EV data sheets refer to this as "step down mode,"
I know, with the vent cover on, the cabinet is tuned around 55hz, without it is tuned around 70hz.
One thing i don t really understand. When i do the calculation according to my speaker specifications, the cabinet volume suggested by the program is almost three times bigger than the tl806, 127 liters to be precise.
The program uses thiele-small parameters, so how did they do the calculation?
I know that an hi-fi cabinet is different and it is designed to not alter the sound.
If i enter the evm12l speaker specifications the program gives me a suggested cabinet volume that is much bigger than the tl806 too.
Hello, yes, the program gives you parameters for open, closed and ported cabinets.
About the vents, you can only chose the diameter, so it is for pipe vented cabinets.
The result is the drawing i previously posted, 4 inches diameter.
