I just did this with my all weather sub. I took all the bolts out holding it in and got a flat head screw driver and checked around the trim to make sure it was loose. And the top and bottom of the mesh there is basically a black plastic piece that the mesh is secured under so you have to wedge it out of there to get the mesh up (I hope that makes sense). I did it, had no problems and put it back in like nothing.

 

On another forum one guy said remove the screws, and then work the tabs on the grill out of the frame. Another guy said turn the bass up and use a vacuum to clean out the junk - once clean, keep the sub covered to keep debris out of it. A third guy said to remove the whole unit, turn it upside down, and use a vacuum and compressed air to get the junk out (I'd be really careful with compressed air).

I don't have the Alpine premium system, so just passing along what others have said.

 

I learned my lesson the after hauling a Christmas tree. I just unplugged the subwoofer turned upside down, shook and vacuumed. Since then I have a microfiber towel over the sub and under the carpeted cover.

 

I use a mat without the sub cutout. No significant decrease is the boom boom.

 

Same here. For exactly this reason.