Acoustic Enclosure Transmission Loss & STC Calculator

Determine mass-law panel transmission loss ($TL$), internal sound buildup ($L_{rev}$), and net noise reduction for machinery acoustic enclosures.

Enclosure Wall & Lining Construction

Wall Panel Surface Density m (kg/m²): 16-ga steel: ~12 kg/m², 1/4" plate: ~50 kg/m²

Interior Lining Absorp Coeff α_avg: 2" fiberglass: ~0.70 - 0.85

Unenclosed Source Noise L_p1 (dBA):

Acoustic Leakage Area / Penetrations (%): Gaps around pipes, doors, louvers

Target Center Frequency (Hz):

Enclosure Wall Type:

Acoustic Transmission Loss & Net Attenuation

Panel Transmission Loss (TL):

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Net Enclosure Insertion Loss (IL):

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Exterior Noise Level (L_p2):

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Internal Reverberant Buildup:

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Estimated STC Rating:

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Leakage Penalty:

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Acoustic Enclosure Insertion Loss Principles

Enclosing a noisy compressor or turbine requires two acoustic elements: high-mass outer walls to reflect sound energy (Transmission Loss), and an interior absorbent fiberglass lining to dissipate reverberant energy trapped inside.

Acoustic Flanking & Gap Leakage

The composite transmission loss of an enclosure is extremely sensitive to gaps and unsealed penetrations. Even an unsealed gap area of only $0.5\%$ caps the maximum theoretical noise reduction at less than $23\text{ dB}$, regardless of whether the steel panels are $5\text{ mm}$ or $50\text{ mm}$ thick.

Acoustic Enclosure Transmission Loss & STC Calculator

Enclosure Wall & Lining Construction

Acoustic Transmission Loss & Net Attenuation

Acoustic Enclosure Insertion Loss Principles

Acoustic Flanking & Gap Leakage

Frequently Asked Questions