There are several things that can cause distortion or
![](./images/smilies/spacer.gif)
"clipping"
![](./images/smilies/spacer.gif)
1.
![](./images/smilies/spacer.gif)
Amp not powerful enough for your sub ie.
![](./images/smilies/spacer.gif)
100w amp powering 500w sub
![](./images/smilies/spacer.gif)
= distortion when volume is turned up.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
This can cause damage to the amp and sub
2.
![](./images/smilies/spacer.gif)
Sub to big
![](./images/smilies/spacer.gif)
/ small for size of box
3.
![](./images/smilies/spacer.gif)
Sub not matched to box i.e the sub requires a ported box and you have a sealed box
4.
![](./images/smilies/spacer.gif)
Crap componets seems unlikely in your case though
5.
![](./images/smilies/spacer.gif)
Bad connections from stereo to amp or amp to sub
6.
![](./images/smilies/spacer.gif)
Too much gain on the amp
![](./images/smilies/spacer.gif)
could be any of them really.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
need more details!!
![Smile :)](./images/smilies/icon_smile.gif)
what head unit are u running as well?