24/15, Veera Savarkar St, Ramana Nagar, Perambur, Chennai, Tamil Nadu 600011
Building Contractors
12mm hole 32mm pitch
Behind panel cavity 50mm
Low frequency absorber
7 well N7 sequence
Measured with dodecahedron
Holes + rockwool behind—Helmholtz resonance absorbs mid-high frequencies.
Thick porous or membrane absorbers in corners—control low frequency buildup.
Scatter sound evenly—prevent flutter echo, maintain liveliness in halls.
Time for sound to decay 60 dB—target 0.5-1.5 sec depending on room use.
Yes, impulse response, STI for speech, NC for noise per ISO 3382—report issued.
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