Subwoofers  
Know more about subs in boxes
Getting a good sound from a sub and box combination can be a tricky old game. All kinds of stuff can alter the sound you get. Box shape and size, materials used and even how the sub is mounted are all variables that make a difference. There are a few rules of thumb that are worth knowing about, though. Check them out below.

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Box size
Box size can play a big part on how it sounds. A small sealed box will give a tight punchy sound where a larger ported box will dish out low frequency bass. Think about your music taste and choose your box accordingly. Hard fast bass will be good from a sealed box, heavy slower bass needs a bigger ported box.<

Box design/shape
Most of the boxes you'll come across are of the standard flat-topped wedge variety, though there are plenty of other shapes out there. A bandpass box is normally large and square, with the sub mounted on an internal dividing wall. This design is good for really low sub bass and is often 'tuned' to excel at certain low bass frequencies. Another sub design you see is where the subs are mounted externally on the box with their cages facing out. There's nothing much to be gained from this, apart from the showing of your sub's cage if it's sexy.
Box material
King of sub box material is our old friend MDF. You'll find most boxes are made from either 1/2 or 3/4in material. These are fastened together with screws and glue, with the edges being lapjointed. Some box builders then seal the insides with silicone sealant. Box covering is normally black or grey carpet.

Protection
Grilles, mesh, bars, even a perspex cover will all help protect your sub if you're gonna put anything in your boot. Even the smallest flying crap can puncture sub cones.

Preservation
Look after your sub and it'll last yonks. Keep the volume down the first couple of minutes every day use to let it warm up. You'll shorten its life nailing it from cold. Make sure the area it lives in is dry and damp free. A soggy sub's a sad sub.

Tips
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Connectors
If you plan on moving your box in and out of your boot a lot, your connectors will get some stick. Go for the all-metal screw type. It's also worth checking what gauge cable you can fit through them. Some subs have weedy ones that you can only fit thin cable through - not ideal.