Most subwoofer enclosures are made out MDF wood because it is strong and won't destruct from heavy bass vibrations. If you have a large empty cardboard lying around the house, you can transform it into a subwoofer enclosure, as an little experiment. It won't provide you with the best sound quality and bass response you will get from a properly built MDF box, but it is better than having no enclosure.
1) Cutting the hole in the cardboard to house the subwoofer. Place the subwoofer onto the middle of the box and draw around it using a marker. This will create a circle outline on the cardboard, so you know how far and how much you need to cut.
2) Obtain a pair of scissors and cut inside the outline you have just made. Be careful not to go over the outline when cutting because the cut maybe too big for the speaker to fit in. If that happens, the speaker will fall through the hole.
3) Using a screwdriver, make a small hole at the back of the box to allow the speaker wire to go out. Then obtain some spare speaker wire and send it through the hole. Then connect the wire with a stripe going down to the positive terminal on the subwoofer. Then connect the plain wire to the negative terminal on the subwoofer.
4) Now place the speaker into the hole and place double sided tape around the edges to hold it in place. You could use screws, but they will not screw in the cardboard, it will just punch in a hole and serve no purpose.
5) Obtain strong duct tape or any other tape that has similar strength. Using it, tape off all the corners and edges of the cardboard box. This will prevent air leaking out from it and will help increase bass response.
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