Dynamat to the rescue - cabin booming noise reduced

[C-Mack]

Some postings and other places have made mention of a cabin booming or reverb type sound when traveling down the road or when you hit a sharp bump at speed, especially when the cabin/cargo area is empty in the Grenadier. I’ve experienced similar sounds and although not horrifyingly loud for short trips on longer highway drives it seems a bit more annoying.

I’m not a big fan of sticking sound deadening material all over the place but I had a hunch the rear floor in the cargo area was acting as a type of drum and might be contributing to the booming sound. So I put down a single layer of Dynamat Xtreme on the exposed part of the cargo area underneath the rubberized mat. I have the cargo hold down tracks so I removed them first so I could lay the Dynamat down completely flat. I reinstalled the tracks on top of the Dynamat and after the first drive it has made a noticeable difference to the sound quality inside the vehicle.

Needless to say, I was dubious such a thin layer of sound deadening material would make such a difference. It’s even quieted down the exhaust so perhaps the rear muffler was contributing to the booming sound and was vibrating the cargo area floor? I’m by no means a sound deadening expert but I’m rather pleased with the results. The Dynamat is thin enough once the rear cargo mat was reinstalled everything looks like stock so you’d never know any sound deadening material has been added.

I don’t think it would present any issues later on if I was to install a drawer system as with the added bulk and structure it would probably help quiet things down even more assuming the drawer system itself doesn’t rattle around. Here are some pictures for anyone dealing with the same issue.

 

[Greg]

While I never had the booming problem, I did the same as my drawer system will sit on the floor, not the rubberised mat.
It certainly made a difference as the back floor is like a steel drum

 

[C-Mack]

While I never had the booming problem, I did the same as my drawer system will sit on the floor, not the rubberised mat.
It certainly made a difference as the back floor is like a steel drum
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Very nicely done… I’m glad I had the same positive results you did. It was actually a fun little job to do and didn’t take very long at all. The Dynamat material was very easy to work with and will most likely install a drawer system in much the same manner as you did.

 

[SkiBum1]

Some postings and other places have made mention of a cabin droning noise or booming sound when traveling down the road at speed especially when the cabin/cargo area is empty in the Grenadier. I’ve experienced similar sounds and although not horrifyingly loud for short trips on longer highway drives it seems a bit more annoying.

I’m not a big fan of sticking sound deadening material all over the place but I had a hunch the rear floor in the cargo area was acting as a type of drum and might be contributing to the booming sound. So I put down a single layer of Dynamat Xtreme just on the exposed part of the cargo area underneath the rubberized mat. I have the cargo hold down tracks so I removed them so I could lay the Dynamat down completely flat. I reinstalled the tracks on top of the Dynamat and after the first drive it has made a notable difference to the sound quality inside the vehicle.

Needless to say, I was dubious such a thin layer of sound deadening material would make such a difference. It’s even quieted down the exhaust so perhaps the rear muffler was contributing to the booming sound and was vibrating the cargo area floor? I’m by no means a sound deading expert but I’m rather pleased with the results. The Dynamat is thin enough once the rear cargo mat was put back in everything looks like stock you’d never know there is any sound deadening material installed.

I don’t think it would present any issues later on if I was to install a drawer system as with the added bulk and structure it would probably help quiet things down even more assuming it doesn’t rattle around. Here are some pictures of the install for anyone dealing with the same issue.

I haven’t noticed a problem with mine, but your solution is really cool!

 

[GN4HIR]

And while those were complete coverage, you can stop the resonating just by adding a couple of sq ft of the material.

 

[grnamin]

Thank you for this thread. Black Friday project...