Most sound deadening sheets contain layers of butyl rubber, polyester film, or fire-retardant thermoplastic elastomer (TPE). These flexible polymers dampen vibrations on contact.
The extra mass increases the damping effect. When installed properly, the Sound Deadening helps “de-couple” the vehicle’s shell from noise sources, keeping the decibel levels more reasonable inside.
Common types of sound deadening materials:
Mass Loaded Vinyl (MLV) – This is considered one of the most effective damping materials. MLV contains layers of vinyl with lead particles distributed throughout. The extra weight gives it outstanding noise blocking abilities but MLV is also quite heavy. It remains a top choice for serious sound deadening systems.
Dynamat – As one of the original consumer brands, Dynamat has widespread recognition. It uses a butyl rubber formulation that adheres nicely to contours. Dynamat is thinner than MLV so it doesn’t add as much weight but noise reduction is still substantial. At a mid-range price, it offers quality performance.
Noico – For a more affordable option, Sound Deadening utilizes synthetic rubber and polyethylene film construction. It performs almost as well as Dynamat at a lower cost. Noico is a good starting point for most DIY soundproofing projects on a budget.
Cascade Audio Engineering Damper – Those seeking the absolute highest noise floor reduction turn to Cascade Audio products. Using advanced viscoelastic polymers, their dampers are engineered to maximize vibrational damping. This comes at a higher price tag but results in the quietest interior possible.
Each type serves a purpose depending on your vibration dampening and noise blocking needs. MLV excels but is heavy, Dynamat and Noico provide quality sound insulation at lower cost points. Cascade Audio caters to hardened audiophiles. Choosing the ideal material involves weighing effectiveness versus budget.
Where should sound deadening be applied?
Doors – As one of the largest body panels, doors resonate readily with road and wind noise. Dampening reduces this effect. Pay close attention to inner and outer skins.
Trunk/Boot Lid – Like doors, the trunk lid acts like a speaker cabinet transmitting noise into the cabin. Soundproofing here makes a big difference.
Floor Pans – Engine and transmission vibrations travel directly into the Floor Mat. Using damping sheets on the underside helps block this noise route.
Firewall – This separates the loud engine bay from passengers. Strong damping here interrupts noise transference into the interior.
Pillars – The B, C, and D pillars act like bridges carrying noise from doors to the roof. Dampening all pillar interfaces hinders this path.
Rear Deck/Parcel Shelf – Located above the rear passengers, this surface readily vibrates with engine drones. Blocking this improves the rear listening experience.
Roof – Low-frequency booming from outside is easily conducted through the roof. Damping its entire inner surface diminishes this effect.
Benefits of installing sound deadening:
Reduced road noise – Highway driving becomes more peaceful as tires roll on pavement and general road sounds no longer intrude on conversations.
Lowered vocal fatigue – Long trips feel less tiring when drivers and passengers don’t have to raise their voices over constant noise. Cabin noise levels between 60-70 dB decrease fatigue.
Less engine vibration – Motor vibrations coming through the firewall, floors, and other pathways into the driver space are significantly minimized.
Clearer stereo sound – With less rattling and resonant booming throughout the body, audio systems can shine without competing noises muddying mid and high frequencies.
Protects interior panels – Over the long run, preventing constant vibration takes stress off mounting points and seams. Factory panels stay in better shape.
Wind noise suppression – Properly damping doors, windows, and roof diminishes howling while traveling at speed on the highway.
Preserves resale value – Vehicles with low interior noise due to quality damping fetch higher prices in the used market.
By curbing multiple common irritating sounds, a full sound deadening treatment creates a relaxing luxury experience even in everyday commuter cars. For any driver valuing peaceful cruising, it’s a worthwhile enhancement.
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