WooferGuy is reader-supported. When you buy through an Amazon link on this page we may earn a commission, at no extra cost to you. It never decides what we recommend. How this works.
Sound deadening is the cheapest upgrade that makes a car sound more expensive. A sub that rattles the trunk lid, doors that buzz on every kick drum and road noise that drowns the midbass all have the same root cause: thin steel panels vibrating. A butyl damping mat stuck to those panels turns that vibration into a little heat, so you hear more music and less car. Here are the mats we’d buy, from brand-name kits to budget rolls.
The short version
- Best overall: Dynamat Xtreme Mega Pack, 72 sq ft from the best-known name.
- Best premium alternative: Second Skin Damplifier Pro, with clear coverage guidance from the maker.
- Best value: Kilmat 80 mil (36 sq ft) or Siless 80 mil (36 sq ft).
- Best small kit: Noico 80 mil (10 sq ft) for a trunk lid or license plate area.
- Pair the mat with a foam liner like Siless Liner where trim panels buzz against metal.
Try the tool: our sound deadening calculator works out the square feet for your car, or from your own panel measurements, and the pack sizes that fit.
Our picks
Dynamat Xtreme Mega Pack
For a full trunk, doors and more from the brand most installers know.
- 72 sq ft total
- Dynamat: one layer is usually enough
- Sold by Dynamat on Amazon
Dynamat is the name people use for the whole category, and the Mega Pack gives enough material for a thorough trunk and door job in most cars. Dynamat’s own guidance says one layer is usually enough and that you don’t need 100% coverage to get most of the benefit.
- Large, consistent sheets
- Clear install guidance from Dynamat
- Enough for doors plus trunk
- Costs more per square foot than budget mats
- Mega Pack is more than a sub-only install needs
Second Skin Damplifier Pro (30 sq ft)
For people who want brand-name mat with detailed coverage advice.
- 30 sq ft in 18 sheets
- Maker guide: 25–60% coverage
- Sold by Second Skin on Amazon
Second Skin publishes unusually specific advice: 25% coverage as a minimum, about 60% as the sweet spot, and full coverage on metal right around speakers and subwoofers. That makes it easy to buy the right amount.
- Detailed maker guidance
- Sheet size suits doors and trunk lids
- Good mid-size pack
- Fewer square feet than the Dynamat Mega Pack
- Premium pricing
Kilmat 80 mil (36 sq ft)
For a budget door and trunk job.
- 80 mil mat
- 36 sq ft
- Sold by A&D Car Comfort
Kilmat is a widely used budget mat, and 36 sq ft covers a pair of doors and a trunk lid in most cars at the recommended coverage level.
- Low cost per square foot
- Thick 80 mil sheet
- Plenty for a sub install
- Less brand support than Dynamat or Second Skin
- Smaller sheets mean more cutting on big panels
Siless 80 mil (36 sq ft)
For a budget job from a brand that also sells matching foam.
- 80 mil mat
- 36 sq ft
- Sold by Siless
Siless offers the same thickness and pack size as Kilmat, and you can buy its closed-cell foam liner from the same brand to finish the job.
- Good value
- Matching foam liner available
- Sold by the brand
- Smaller sheets than premium mats
Noico 80 mil (10 sq ft)
For a trunk lid, license plate area or one pair of doors.
- 80 mil mat
- 10 sq ft
- Sold by A&D Car Comfort
If your problem is one rattling panel, a 10 sq ft pack is enough to treat the trunk lid and license plate area without buying a roll you won’t finish. See our trunk and license plate rattle fix for where to put it.
- Cheap way to fix one problem area
- Easy to handle
- Too little for a full door and trunk job
Skar Audio 80 mil door kit (12 sq ft)
For a quick door treatment when you upgrade speakers.
- 80 mil
- 4 sheets, 12 × 36 inches
- Sold by Skar Audio
Long 12 × 36 inch sheets suit the outer skin of a door, where most of the buzz comes from when you add a sub or new speakers.
- Long sheets fit door skins
- From a car-audio brand
- Only 12 sq ft
- You’ll need more for the trunk
Siless Liner closed-cell foam (36 sq ft)
For stopping trim panels buzzing against metal, after the mat.
- 157 mil closed-cell foam
- 36 sq ft
- Sold by Siless
Damping mat stops panels resonating; foam decouples plastic trim from the metal behind it. Put it on top of the mat, on the back of door cards and under trunk trim.
- Stops plastic-on-metal buzz
- Adds some heat insulation
- Doesn’t replace a damping mat
Mat, foam or mass-loaded vinyl?
| Material | What it does | Where it goes |
|---|---|---|
| Butyl damping mat (CLD) | Stops metal panels resonating and rattling | Door skins, trunk lid, trunk floor, roof |
| Closed-cell foam | Decouples trim from metal; stops buzz | On top of the mat, behind trim panels |
| Mass-loaded vinyl (MLV) | Blocks airborne road noise | Floor, over foam, in a full noise build |
For a bass-focused car-audio install, a butyl mat on the trunk and doors is 80% of the result. Foam comes next. MLV is mainly for quieting road noise and is a bigger job.
How much do you need?
For a sub-only install, start with the trunk lid, trunk floor and license plate area. Dynamat suggests 12–24 sq ft for a pair of front doors if you cover both inner and outer skins, and Second Skin recommends about 60% coverage on most panels. Our sound deadening coverage guide has square-foot estimates by vehicle type.
Install tips
- Clean the metal with denatured alcohol or a similar degreaser first; the adhesive won’t hold on dust or oil.
- Press every sheet down firmly with a roller so there are no air pockets.
- Cover the center of large flat panels first. That’s where they vibrate most.
- Don’t block drain holes in doors, wiring clips or moving window parts.
- Wear gloves: the aluminum edges are sharp.
FAQs
Does sound deadening make bass louder?
It doesn’t add output, but it stops energy being wasted in rattles and makes bass sound tighter and cleaner. You hear more of the sub and less of the car.
Is Dynamat worth the extra cost?
You’re paying for the brand, sheet consistency and support. Budget butyl mats like Kilmat and Siless do the same basic job and are fine for most sub installs.
Can I use roofing flashing instead?
We don’t recommend it. Some roofing products are asphalt-based, smell in hot weather and can soften in a summer car.
How thick should the mat be?
Around 80 mil is the common choice. Thicker isn’t automatically better: coverage of the right panels matters more.