Next, we will consider the program using the example of the Band pass of the 4th order.

Driver tab

9-10. Again, you can specify the number and type of speaker installation.
11. Additional features.

Box Tab

12-13. Box chambers
14. Chamber volume.
15. Camera setting frequency.

Vents Tab

16. Number of Bass Reflex(s)
17. Bass reflex(s) diameter
18. Length of Bass Reflex(s)
19. Round or rectangular type. you can change nav to a circle.
20. View of the phase inverter.

We proceed to the main calculation of the box.

21. Click on the schematically shown box with the right mouse button while holding down move the cursor along the (X) axis horizontally change the volume along the (Y) axis vertically to change the frequency. Similarly, Left click to change the parameters of the lower camera. The top of the curve should be above the red line between 35Hz and 120Hz if it is a subwoofer as wide and as flat as possible.

transfer function magnitude. frequency response

Something like this, but the lower limit is 40Hz, and the upper limit is 113Hz, this is also suitable.

Where I marked with red dashes in practice, the frequency will be cut off by the crossover.

Choose a graph: Maximum Power

Maximum Power

In this graph, the program shows the maximum power versus frequency. It can be seen that there is a power drop, a peak drop of 60 watts at 39 hertz, in practice, the speaker cone does not have enough travel (Xmax) and unpleasant sounds appear - distortions. On the finished product, this must also be taken into account and limit the power

Choosing the Maximum SPL chart

maximum SPL. This graph shows the maximum sound pressure

There is also a decline. For the same reason. The last two graphs are from another speaker, I showed them to make it clearer.

Here are the graphs for our test subject. The first one is a little implausible at a frequency from 0 Hz to 25 Hz, all speakers have a roll-off.

Now you need to decide on the size of the box in which the speaker will be installed.

To do this, run the WinISD 0.44 program, click on the new project.

We need to enter the parameters of our speaker into this program. in its database it is not for this, click "New"

Let's move on to WinISD 0.50a7

22. By pressing this button you can see the T/S parameters to be entered into WinISD 0.44.

Enter the parameters, click OK and close this window so as not to interfere.

We create a new project.

23. Rearrange the checkbox to select the speaker.

Click next, and do exactly the same as in WinISD 0.50a7

Transferring box parameters from WinISD 0.50a7 to WinISD 0.44.

24. Click to start calculating the size of the box.

25. We press and the program gives out the optimal dimensions in its opinion. We have at our disposal a 10 inch loudspeaker with a total external diameter of 300 mm to fit it in a box dimensions W and D must not be less than 300 mm.

26. We enter the width of 300 mm equals 0,300 meters.

30. You can change the units of measurement by simply clicking on the dimension in this case, the letter "m".

28. Enter the length of 0,300 meters.

27. Click on "H" the program shows the height.

31. Pay attention to L1 and L2, this is the height of the cameras, you need to look so that the depth of the speaker insert does not exceed the value of L2.

But it is necessary to take into account the thickness of the material, it will overlap, even in the nutria there is a shelf in which there is a speaker and its thickness should also take into account the speaker itself, because it also occupies it, I already took it into account if the box is large there should be spacers inside, they must also be taken into account. It turns out 7 parts, in order to calculate the parts correctly, it is necessary to take into account that some of them will overlap because the program shows the inner diameters. With the letter "P" I will prick the thickness of the material that must be added to other values.

1)DxW
2)DxW
3)DxW
4)H+(P*3)xD
5) H+(P*3)xD
6) H+(P*3) x W+(P*2)
7) H+(P*3) x W+(P*2)

We get the dimensions of the parts if the thickness of the material is 20mm:

1) 300x300
2) 300x300
3) 300x300
4) 420x300
5) 420x300
6) 420x 340
7) 420x 340

Now you can proceed to the calculation of the phase inverter.

32. The type of phase inverter we will use is rectangular

33. Long. When the end of the phase inverter is offset from the wall of the box

then it virtually lengthens, and in fact it turns out that it is tuned to the wrong frequency and longer length WinISD 0,44 does not take into account the virtual lengthening can be calculated by yourself using the formula, but it's easier to look into the WinISD 0.55a7 program

I repeat: this is valid only when the end of the phase inverter is offset from the wall of the box, and when it protrudes, this does not work. So the program WinISD 0,44 shows 28,86 cm and WinISD 0,55a7 25,64 cm.

Here are the final dimensions of the parts. And their number.

1) 300x300
2) 300x300
3) 300x300
4) 400x300
5) 420x300
6) 420x340
7) 420x340
8) 300x255

34. Air resistance. The air resistance in the phase inverter should be made as small as possible by increasing the area of ​​the phase inverter opening.

Author: Sobich Aleksej; Publication: cxem.net

See other articles Section Speakers.

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