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Identified Issues- Noise from the dashboard
- Engine bay noise
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Work Performed- Dashboard soundproofing
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Results- Reduced noise from 83Db to 78Db
Photo Report of Completed Work
Metal weakness
All metal in the stock Hiace is weak, and even brand-new cars can have metal separation.
This is not acceptable for SPL projects — high sound pressure will eventually crack the metal.
This is not acceptable for SPL projects — high sound pressure will eventually crack the metal.
Sika 300ml Black Sikaflex-252 Polyurethane Adhesive
- Bonds well to a wide variety of substrates
- Capable of withstanding high dynamic stresses
- Good gap-filling properties
- Vibration-damping
- Can be painted
Increase metal strength
Here’s a clean, corrected version:
It required 40+ bottles of Sika automotive sealant to fill all gaps between metal panels.
Hydraulic pressure was applied to maintain the correct panel shape while the sealant cured.
It required 40+ bottles of Sika automotive sealant to fill all gaps between metal panels.
Hydraulic pressure was applied to maintain the correct panel shape while the sealant cured.
Roof Soundproofing
For all metal and plastic panels, we used the proven solution STP Massa Bassa.
It increases panel rigidity by up to 4×, which is sufficient for SPL builds.
It increases panel rigidity by up to 4×, which is sufficient for SPL builds.
StP Massa Bassa Sound Deadening
Need maximum vibration control for high-power SPL sound systems?
StP Mass’a Bass’a is a heavy-duty, multi-layer sound-deadening material built to handle deep bass vibrations and harsh road noise — ideal for professional installations.
Why it works:
StP Mass’a Bass’a is a heavy-duty, multi-layer sound-deadening material built to handle deep bass vibrations and harsh road noise — ideal for professional installations.
Why it works:
- Triple-layer build: aluminium foil top + bitumen vibration-absorbing core + adhesive base.
- Extra-thick (4.2 mm) for powerful low-frequency vibration damping.
- Designed for car audio — removes bass-panel buzz and improves clarity.
- Durable & safe: works from –45 °C to +70 °C, humidity-resistant (up to 98 % RH).
- Perfect for high-SPL setups or luxury restorations.
Side Walls Soundproofing
Here’s a clean, corrected version:
Side walls play a crucial role in SPL projects. If they flex, you lose significant dB in competitions.
By installing two layers of STP Massa Bassa, you eliminate this issue and make the structure extremely rigid — effectively bulletproof for SPL.
Side walls play a crucial role in SPL projects. If they flex, you lose significant dB in competitions.
By installing two layers of STP Massa Bassa, you eliminate this issue and make the structure extremely rigid — effectively bulletproof for SPL.
Doors Soundproofing
Even though SPL builds don’t require speakers in the doors, they remain a critical part of the car.
Stock plastic and metal resonate heavily, which negatively affects overall performance.
Doors Soundproofing
We install two layers of STP Massa Bassa to make the panels completely quiet and eliminate any rattles.
This also creates a solid enclosure, ideal for future audio upgrades.
This also creates a solid enclosure, ideal for future audio upgrades.
Plastic Door Card
Since the original plastic is weak, we increase its strength by applying vibration damping with STP Massa Bassa.
Door Card Soundproofing
To prevent any plastic-to-plastic contact, the entire surface was covered with soft STP Biplast 10 mm.
This creates an additional protective layer, allowing the door card to sit securely — almost like on a pillow.
This creates an additional protective layer, allowing the door card to sit securely — almost like on a pillow.
Dashboard Soundproofing
When dealing with loud cars, the dashboard plays a crucial role.
Even though it has multiple mounting points, it’s made from weak plastic and wasn’t originally designed to handle extreme vibration levels of 160+ dB.
Even though it has multiple mounting points, it’s made from weak plastic and wasn’t originally designed to handle extreme vibration levels of 160+ dB.
Dashboard Soundproofing
A dashboard was fully dissasempled and wrapped with soft Stp Biplast 5mm to prevent any plastic cintacts. It gives a fantastic acoustic comfort
Products we used in this Project
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