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Thoughts on MLV


bushroot

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Now that it's warmed up enough to sound deaden my Scion, I'd like some advice about MLV and how much of a difference people have noticed in noise floor by using it. It's one thing to read on the interwebs about how great it is and all, but how much of a difference did you hear between using a CLD dampener and using CLD/foam/MLV?

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I haven't worked with it as much as I should, but I plan to have some installed into my 49 Ford Project.

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Now that it's warmed up enough to sound deaden my Scion, I'd like some advice about MLV and how much of a difference people have noticed in noise floor by using it. It's one thing to read on the interwebs about how great it is and all, but how much of a difference did you hear between using a CLD dampener and using CLD/foam/MLV?

  • CLD damper mat is for treating panel resonances
  • Closed cell foam is for isolating panels and hard parts that are touching and making noise
  • Mass loaded vinyl is for blocking sound, such as outside road noise or to reduce interference from sound coming through the door from the back side of the speaker

CLD alone is usually used incorrectly as a "silver bullet" sound damping solution. One product can't treat the variety of acoustic problems in a vehicle. CLD has been very helpful to quiet my buzzing door panels, but adding CCF and MLV from www.sounddeadenershowdown.com using Don's instructions and the vinyl cement was a very beneficial addition to my car. It noticeably lowered the annoying effect of road noise which was coming right through the doors, and it improved the midbass response as well. My Saturn is notorious for being noisy, even when these cars were new, so your results may vary if your vehicle has better noise treatments from the factory.

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  • 5 weeks later...

Well, I ordered the MLV. It's some expensive shit for what it is. We'll see how I feel about it.

did you get it in yet?did it make a major improvement?im needing to put some in my xb also :morepower1:

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http://www.stevemeadedesigns.com/board/topic/181354-scion-xb-front-stage/page-3

Scroll down towards the bottom of the page. I installed CLD mat, closed cell foam for decoupling, and MLV. The car is much quieter now. I have an exhaust leak under the passenger seat area which I can barely hear now. My rear doors are still undampened, so I can hear them. I would suggest taking some time with the rear hatch. I think that was the most challenging thing to sound deaden. I put CLD mat everywhere I could get to and it did nothing. In the end, I took closed cell foam, rolled it tightly, and taped it. I put these between the inner structure and the outer shell. I can't believe how quiet it is now. If you can't visualize it, I'll be working on the car again this weekend and I can pop the cover off and take a few pictures.

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I put it on the back panel of my extra cab truck and the floor. I didn't glue it down just laid it down and used aluminum tape to hold it together. The truck is much quieter. I used a material we have at work to sound deaden HVAC units. Its about 3/16" thick rubber with a foil back on it. I got it for free as we had some scraps. Its heavy but does a great job of blocking out the sound of the road, exhaust and tire noise.

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