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If your engine room feels louder than it should, you’re likely dealing with low-frequency generator noise (40–250 Hz). The most effective fix is installing a high-mass marine sound barrier on bulkheads or as a full enclosure. In California, this also helps meet Cal/OSHA limits of 85 dB (8-hour TWA).
The Noise You Don’t Just Hear—You Feel
Step into a marine engine room while generators are running, and you’ll notice something different. It’s not just loud—it’s a deep, rolling vibration that moves through the entire vessel.
This is low-frequency noise, often reaching 100–115 dB, and it doesn’t stay contained. Instead, it travels through:
- Steel bulkheads
- Deck systems
- Structural framing
Before long, that same rumble shows up in crew quarters, control rooms, and workspaces—turning into a constant, unavoidable presence.
Why Most “Fixes” Don’t Work
Many try to solve this with foam or lightweight insulation. At first glance, it seems logical—but low-frequency noise doesn’t behave like typical sound.
It demands mass, not softness.
- Foam absorbs high-frequency sound, not deep vibration
- Lightweight materials lack the density to stop transmission
- Structural noise bypasses surface-level treatments
The result? The noise keeps moving—unchanged.
Where the Real Solution Begins
To stop low-frequency generator noise, you need something fundamentally different: mass and continuity.
That’s where MassiCore® Marine 135 (ANC-MB135) comes in.
- Built with a 2 lb mass loaded vinyl barrier
- Designed specifically for deep, low-frequency control
- Flexible enough for tight marine installations
- Durable foil-facing for harsh environments
Instead of trying to absorb the noise, it blocks and contains it at the source.
Installed the Right Way—Everything Changes
When installed properly, the transformation is immediate.
- Applied directly to engine room bulkheads
- Integrated into a continuous barrier wall system
- Fully sealed to eliminate sound leaks
What was once an open pathway for noise becomes a sealed acoustic boundary.
From Overwhelming to Controlled
The results aren’t subtle—they’re measurable.
- Noise drops from 110–115 dB to 70–75 dB
- Spaces become quieter, safer, and more functional
- Communication improves, fatigue decreases
And most importantly, operations move closer to California OSHA compliance:
- 85 dB (Action Level)
- 90 dB (Permissible Exposure Limit)
Why This Matters in California
With some of the busiest ports in the country, California demands stricter control over workplace noise. It’s not just about comfort—it’s about meeting regulations and protecting crews.
Ignoring low-frequency noise isn’t just inconvenient—it’s a liability.
