Can i change the tuning of a subwoofer?

if a sub is specifically supposed to be tuned to 40hz what would happen if i wanted to tune it to 30 or 35hz? would it damage the sub? how would i change the tuning? different port lengths?Can i change the tuning of a subwoofer?
Generally speaking a woofer is rated at a certain Hz beacuse that is the woofer's sweet spot, where it sounds best.



You really can't change the tune of the woofer itself but you can change the tune of the box by adjusting port lengths, adding or removing sound deading material inside the box, and adjusting the overall box size.



Your risks by doing this are 1. your box will sound worse 2. you may over extend your woofer causing damage.



I would recommend that you pick up some deading material (cotton, felt, foam, dynamat etc..) to attach to the inner of the box first. This will soften the harshness of the soundwaves reflecting off the back of your box and cause it to sound deeper/lower.Can i change the tuning of a subwoofer?
it can be done on your head unit or if not turn the gain down on the ampCan i change the tuning of a subwoofer?
Here's the skinny on enclosures:



http://spkrbox1.spaces.live.com



_______________

Advisory: Avoid the person with the screen name HardThinker. He is portraying to be someone with knowledge, ignore him.



Here is an example:



http://answers.yahoo.com/question/index?



The answers given by this individual have been deemed to cause serious personal injury or equipment damage.Can i change the tuning of a subwoofer?
A subwoofer has its own natural tuned frequency (on specs as Fs), but that isn't a recommendation as to how to tune the box. Basically, when you want to have a ported box, tune it to what you like. If you listen to a lot of rap and songs that have low, low bass, then tune it low. Otherwise it would be okay to tune it slightly higher. And no, the sub wouldn't be damaged. If you want the tuning of the enclosure to be lower, then basically you want the port length longer, or the port size smaller. However, increased port area, from what I've experienced, tends to be louder. For example, a 4%26quot; port thats 6%26quot; long may tune a box the same as 3 6%26quot; ports that are a foot long each, however the 3 6%26quot; ports would seemingly be louder. I dunno, basically to answer your question, no damage will be done. Tune your box to what you listen to and enjoy.