Subwoofer cabinet manufacturing

You need composite plywood made of hardwood, not softwood. This costs more because the enclosure must be resistant to acoustic pressure and sealed to prevent any vibration; it's not a piece of furniture. Ideally, we use 15mm MDF.

The thickness varies based on the load power; we can reinforce it with battens if we exceed a certain power, like 1000w RMS, so it should be 18mm!!!

The volume calculation is done roughly; you can't calculate it like that... you don't know the parameters of the speaker, hmm.

Regarding the port, it's just talk, but there are benefits to using a hole saw for cutting; otherwise, you need to use a PVC TUBE port...

hp= speaker

It all depends on the quality of the speaker!

only 38?

he can also make one with a 30 cm speaker, a 25 cm, and even a 20 cm!
it's entirely doable but it's better that he takes the largest speaker from a car audio kit if he wants to stick with a small speaker!

The wood to be used is "medium" of 16mm or 19mm.

Sealing must be perfect; apart from the vent hole if that is your choice, there should be no leaks from the assembly of the boards. This should be done by gluing and screwing. A tube of silicone and screws of sufficient length will do the trick at a very modest price.

The inside of the box can remain raw, but if you wish, you can dress it with acoustic absorbent material which can be either: plain chant (very very expensive (from your car radio dealer)), egg crate foam (from your car radio dealer or your DIY store), rock wool (from your DIY store), or spray Blakson for thin layers or hard-to-reach places, or in a pot for thick layers (from your DIY store or your body shop).

If your choice is for a box with a vent, the ideal is to buy the vent commercially as you will get the best sound quality. Otherwise, you have the option to simply build it with a piece of PVC pipe (plastic drainage) of the diameter and length that suits you.

For connecting the wiring to the box, it is preferable to have something removable while keeping a solid connection. The best option is to buy a gold terminal block from your car radio dealer. Otherwise, you have the "Mac Gyver" solution, which consists of drilling two 6mm diameter holes in one of the walls of the box. Then, on the inside, pass a 6mm diameter screw through each hole (new screws and not painted for perfect contact), through which you will have previously passed an eye terminal with a wire connected to one of the terminals of the subwoofer. So you have one screw connected to the positive terminal of the subwoofer and one screw connected to its negative terminal. You secure these screws with a nut on the outside, and that's it. You just need to mark next to the screw that has now become the positive terminal of your box. Then, using eye terminals, connect the wiring from your amplifier to these new terminals, and tighten with wing nuts, allowing you to plug and unplug by hand as needed.



The use of protective grilles can be very useful, but must be handled with extreme caution. Because in many cases, if they are not rigid enough or insufficiently fixed, they will vibrate and you will only hear very unpleasant noise.

Similarly, if you decide to use plexiglass, it is true that this can give you a very nice looking box, but beware of vibrations. To make just a window on one side of the box, the thickness of the plexiglass must be at least 10mm with relatively close screws.

For the outer covering of the box, let your imagination run wild: plain or patterned carpeting, plexiglass, fun paint, mirror, ....



Surface: Volume:
Circle
A = 0.79 x D x D

Rectangle
A = H x W

Triangle
A = 0.5 x H x W

Cylinder
V = 0.79 x D x D x H

Triangular
V = 0.5 x H x W x D

Cone
V = 0.26 x D x D x H

Rectangular
V = H x W x D



From: Multiplier In
inches (inches) 0.0254 meters (meters)
meters (meters) 39.37 inches (inches)
square inches (square inches) 0.007 square feet (square feet)
square feet (square feet) 144 square inches (square inches)
cubic inches (cubic inches) 0.00058 cubic feet (cubic feet)
cubic feet (cubic feet) 1728 cubic inches (cubic inches)
liters (liters) 0.035 cubic feet (cubic feet)
cubic feet (cubic feet) 28.3 liters (liters)


And here are the diagrams: Click on the images


Closed box enclosures are one of the best compromises between load capacity and power, as the air trapped in the enclosure acts almost as a cushion for the rear membrane.

The advantages: are a simple construction of the box, a high load capacity, excellent impulse response, and a smooth frequency transition in the bass range.


The disadvantages: are an average efficiency for the low frequencies and the need for relatively large speakers.



In comparison to closed boxes, bass-reflex enclosures offer, due to the use of a vent, a wider range of transmission for low frequencies.

The advantages: are a wider bass range, reduced distortion due to smaller excursions of the membrane, high efficiency, good impulse response, moderate box dimensions, and high load capacity.



The disadvantages: are a complex construction and possible damage to the subwoofer in case of extreme excursions of the membrane below the tuning frequency of the bass-reflex box.




Bandpass enclosures have only recently been available in the field of car acoustics and offer some advantages over closed or bass-reflex boxes.

Among these advantages: we find satisfactory efficiency, small dimensions, good impulse response, better reproduction of the bass range as well as the possibility of being connected to a very high-power amplifier.


The disadvantages: are a slightly lower efficiency than bass-reflex boxes and a more complex construction of the box.


In double-vent bandpass boxes, the acoustic waves from the front and rear of the subwoofer are routed through individually tuned chambers.

The advantage: of this box is the high efficiency for a narrow frequency range.


Among the disadvantages: we count the complex construction, the large box dimensions, the poor impulse response, and sensitivity to extreme excursions of the membrane (risk of damage) for sound parts outside the primary frequency band.


Push-pull closed-box enclosures with a constant air pressure volume hermetically sealed between two subwoofers are moved in the same direction.

The advantage: reduces the volume needed for both subwoofers by up to 50%. If done well, the result can be astonishing.


The disadvantage: an approximate 3% drop in efficiency, but generally compensated by a more powerful amplifier. The assembly must be very precise as well as the amplifier adjustments, otherwise beware of breakage.



Push-pull double-vent enclosures.

The advantage: an increase in efficiency. The result can also be spectacular.



The disadvantage: An increase in volume in addition to the disadvantages of the closed-pull enclosure.

Salut, je te laisse mon MSN. Moi, j'ai deux Pioneer TS-A2506I, ce sont des 25 cm, et je voudrais faire un caisson pour chacune. Peux-tu me répondre sur mon MSN ? Merci d'avance...

False if the boomer is a low-frequency speaker, for example, and the user only wants low frequencies, they will need a passive band-pass filter!

bass pass iasca

I have just started building a subwoofer enclosure, you can follow the progress of the project on my Blog.

http://autogire-rc.over-blog.com/