ResoNix Lockout - Hydrophobic Melamine Automotive & Marine Sound Absorbing Sheet

ResoNix Lockout is commonly applied to the outer door skin behind door-mounted midbass drivers to absorb rear wave energy and reduce internal airborne reflections. By minimizing these reflections, Lockout helps clean up the acoustic environment inside the door, which improves midbass response and clarity. The hydrophobic melamine foam efficiently absorbs sound energy across a wide frequency range, and the reinforced vinyl-facing adds low-frequency absorption while protecting the foam from damage during installation or long-term vibration. This makes it an excellent choice for improving system performance without adding bulk or complexity.

Lockout is highly effective when installed between the roof skin and headliner. It absorbs wind and road noise reflections inside the cabin and acts as a thermal barrier by slowing radiant heat transfer from the sun. The hydrophobic melamine core resists compression and breakdown under heat and vibration, while the reinforced facing adds structure and improves absorption in the low-mid frequency range. This results in a quieter, more comfortable cabin environment and a reduction in unwanted high-frequency noise.

Inside subwoofer enclosures, Lockout helps to absorb excess high-frequency content and reduce internal reflections that can lead to standing waves and distortion. This allows for more controlled energy decay, faster transient response, and better performance from the system as a whole. Its lightweight design and adhesive backing make it easy to apply inside curved or complex enclosures, and the reinforced facing ensures durability even when exposed to high output levels and air pressure.

Lockout is well-suited for under-hood applications and interior firewall panels. It absorbs airborne mechanical and engine noise while providing thermal insulation from heat radiating off the engine. The melamine foam remains stable under extreme temperatures, and the reinforced facing protects the foam from heat cycling, oil mist, and vibration. It is ideal for keeping cabin temperatures down and reducing high-frequency engine noise from bleeding into the passenger compartment.

Lockout is a great solution for insulating and acoustically treating camper vans and adventure vehicles. It is commonly used on ceiling panels, upper wall cavities, wheel wells, and storage enclosures to reduce airborne reflections and control thermal transfer. Its hydrophobic properties make it reliable in both hot and humid conditions, and its simple peel-and-stick installation makes it easy to apply across large areas with minimal prep. For those looking for even greater acoustic control and the addition of noise blocking, ResoNix Guardian is the next step up.

Lockout is an excellent solution for lining the inside of marine engine compartment covers. The hydrophobic melamine foam absorbs airborne engine noise that builds up inside these cavities and reduces high-frequency reflections that can make the engine sound harsh or shrill. The reinforced vinyl-facing improves low-frequency absorption and protects the foam from wear during access or maintenance. Lockout remains stable in high-heat and high-moisture environments, making it well-suited for the demanding conditions found in boats and other marine vessels.

Applied to the interior walls of engine bays, Lockout helps reduce the buildup of unwanted noise that reflects around structural surfaces and contributes to overall engine volume inside the cabin. It also slows radiant heat transfer from hot engine components into the surrounding areas. Lockout holds up well to vibration, mist, temperature cycling, and humidity, without breaking down or absorbing water like traditional foams. This makes it a dependable absorber in spaces where performance and longevity matter.

Inside boat cabins, Lockout can be used to treat flat interior panels such as bulkheads, storage doors, and upper wall surfaces to reduce reflected noise and improve cabin comfort. It helps minimize echo and ringing, especially in fiberglass-intensive builds that tend to amplify sound. Its light weight and easy installation make it perfect for panelized marine interiors where traditional insulation or layered composites may not fit or stay adhered. The added thermal insulation also improves comfort by stabilizing cabin temperatures.

Lockout is a smart choice for marine storage lockers and compartments that contain pumps, plumbing, or other mechanical components that generate airborne noise. It can be easily cut and shaped to fit contoured or narrow enclosures and will not break down when exposed to water, fuel vapor, or temperature swings. Its long-term reliability and acoustic effectiveness help keep noise down in areas where water-resistant materials are essential.

Lockout is ideal for lining the interior of machinery enclosures where airborne mechanical noise needs to be absorbed and internal resonance reduced. It helps dampen high-frequency chatter and vibration-related noise caused by motors, actuators, and moving parts. The hydrophobic melamine core holds up under long-term vibration and heat, while the reinforced vinyl-facing improves low-frequency performance and protects the foam from damage during service or inspection.

In both stationary and portable generator enclosures, Lockout helps reduce high-frequency mechanical noise that escapes from ventilation or access panels. It installs easily with its peel-and-stick adhesive, conforms to irregular surfaces, and won’t sag, absorb moisture, or break down over time. Its thermal stability also makes it suitable for use near warm components without the risk of melting or off-gassing, which is common with basic polyurethane foams.

Lockout can be applied to walls and interior panels of compressor and pump rooms to absorb reflected sound, tame mid-high frequency buildup, and improve workplace comfort. Its ability to stay effective in high humidity and fluctuating temperature environments makes it a reliable solution where standard foams would fail or degrade. The reinforced surface resists wear and tear in spaces with high airflow, vibration, or occasional contact.

For HVAC rooms, water heater bays, electrical closets, and utility areas, Lockout reduces echo, panel vibration, and unwanted mechanical noise that can spill into nearby offices or living areas. It also slows thermal transfer between conditioned and unconditioned spaces. Its clean appearance, long-term durability, and resistance to sagging or crumbling make it suitable for exposed installs where access or visibility is a factor.

Lockout is effective for absorbing airborne reflections inside isolation booths, vocal recording areas, or R&D testing cells. It can be mounted to walls and ceilings to control reverberation and improve clarity within the space. While it is not designed for soundproofing, its absorption performance contributes to better control of the internal acoustic environment. Its structural integrity and resistance to dusting or sagging make it superior to raw melamine sheets or low-grade acoustic foam tiles.

Applied to vertical wall surfaces, Lockout helps reduce reverberation time and control high-frequency noise buildup in large industrial spaces. This can improve communication, reduce ear fatigue, and make work environments more manageable. It is especially useful in spaces where exposed insulation is not acceptable or where constant airflow and particulate buildup would degrade lesser materials. Lockout’s hydrophobic melamine and reinforced facing allow it to function for years without breaking down.

Lockout can be installed inside power distribution and control cabinets to absorb switching noise, relay chatter, and airborne resonance from transformers or capacitors. It fits easily into small enclosures and maintains full performance in high-temperature, low-airflow conditions. The adhesive backing simplifies installation and prevents the need for clips, pins, or surface treatments. Lockout remains intact even during servicing or repetitive access.