more output and less rattle

[Beatin' 10+ year member]

My intrepid has a steel c-pillar wall the divides the trunk from the cabin. The steel wall does have some openings in it but it's all covered by some sound deadening/carpet/felt type material. Of course the upper part of the back seat sits right up against it too.

The back seat has a fold out arm rest, but it doesn't have that opening into the trunk like some cars do. I was wondering if cutting a hole in that arm rest back part and into the c-pillar steel wall will increase output into the cabin and also reduce air pressure buildup in the trunk?

Now in my car, by chance, the c-pillar wall just so happens to have a hole right where the arm rest back pad is. But it is covered by that sticky sound deadening material and back pad. I could just cut a hole into the deadening material and remove the back pad on the back seat but would it produce anymore output over the empty 6x9 holes on the rear deck?

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[™Caveman 10+ year member]

When I have my rear armrest down with armrest door open there is a notable difference in loudness...but not much difference in vibration. Your gonna have to trust your gut on that decision because want to cut the fabric there's no turning back.

 

[Beatin' 10+ year member]

I went ahead and did it anyway.

There is no obvious difference.......except that the kick drums in my music are more noticeable and detailed. It's like before they were muffled.

I had to razor cut the back pad of the seat where the arm rest would fold up against but it's easily fixable. Nothing super permanent was done.

I would figure the less objects and materials separate the trunk from the cabin, the better the sound waves would enter the cabin and possibly reduce cancellation , etc....

I've heard systems in cars where the seats fold down, exposing the trunk, and the difference is night and day compared to my car.

 

[Bassman999 10+ year member]

Every car is different. I have heard cars that are louder with seats up.

Makes no sense to me, but it was

 

[Bassman999 10+ year member]

Every car is different. I have heard cars that are louder with seats up.

Makes no sense to me, but it was

 

[Beatin' 10+ year member]

i'm thinking about sealing the trunk now, but without removing the steel wall. I figure because that steel wall has such large openings in it, I can flip the subs to face the cabin and seal the edges and deck. Then I can put a 2x4 rig behind the subs to keep them from sliding back.

But how would I go about sealing the subs from the trunk? Can I uses many rags all around the sub box? What about the rear deck? I can seal off the 6x9 holes but there's still lots of little crevices.