If you notice that the bass coming from the car subwoofer is not tight enough and you can hear air rushing out from somewhere on the lows, the box its enclosed into might be suffering from small air leaks. This can be created if you have not used silicon when making the box around all of the edges and corners. Resulting in your subwoofer sounding bad at high volumes. Having a subwoofer box that is suffering from air leaks can have a vital impact of the sound quality and spl loudness your speaker produces. Before thinking about if you having any air leaks on the sub box, its best to check if you can tell where they are. The best way to tell is to play music with good bass on high volume and run your hand over the carpet. If you feel cold air rushing out anywhere around the enclosure you have spotted an air leak right away.
Now the best way to seal a subwoofer box is to use a polyurethane base construction. This can be any wood based glue because it will expand when its dried up sealing up all the air leaks. It is also important to ensure that you don't place the speaker back into the box without allowing the glue to dry for at least 24 hours. This is because the strength of it can damaged the rubber surrounds, getting into the voice coil and spider.
1) Get a Philips head screwdriver and remove all the screws found on the outer edge of the sub.
2) Once you have removed all of them, carefully lift out the subwoofer from the box.
3) Look at the back near the magnet you will see two speaker wires going into the terminals. What you want to do is remove them.
4) Place the speaker down in a safe location. Now that you have full access to the box its best to take it into a free space such as your workshop or garage. Since the glue solution can get messy and its not something that you want to do on your carpet.
5) Unscrew the protective cap from the wood glue. Position the pointy tip on the plastic bottle, squeezing the bottle run it around the edges from left to right inside the box. Do this for each edge found inside the box, in all the corners and to make extra sure around the terminal cup that is fitted.
6) Allow the box to dry for a minimum of 24 hours to ensure the glue is fully dried because the last thing you want is your sub being seized from the glue when its drying of inside the box.
7) All you need to do now is reconnect the speaker wires back onto the terminals. Ensure that you connect them the right way around matching the positive and negative wires with the signs on the connectors. This is because you don't want the signal to be in reversed polarity or the cone will be moving backwards and the bass will not be playing clear to its full potential making your system sound crappy.
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