Do you have a crossover on the amp? Deepending on what music you listen to, all of the frequencies may not be seeing the subs. Bass in rock music tends to be around 200Htz while many built in crossovers cut off around 100 with a 12-24db slope. Try a rap cd and see if you notice a difference. If so, you may need to either adjust the crossover or buy a external one for more flexibility. If the crossover is not the problem, then ensure you have the sub sealed properly. Press on the woofer. It should have a firm resistance and spring back instantly. If it feels spongy or gives off a sound (of leaking air) then remove the sub and reseal it. There are many options for sealing. Gaskets can be bought or made from rubber or foam. Silicone is the best method, but is much more permanant. I use a tube of silicone lubricant. It is very thick and can be wiped clean if you remove the sub. very nice in situations where the sub is removed frequently. I also coat the inside of my box with rubber spray. It has two functions. First, it will help to seal any leaks in the box structure. Secondly, it dampens the resonance (think of it as feed back) resulting from internal sound waves.
If these don't help, then list your system entirely for us. What Head Unit do you have. Do you have rca or Line out converters running to the amp? What size of speaker, power, and ground wire are you using? All things can cause the problem. However, my bet is on the crossover or a leak.
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