Musicians usually use decibels to determine the loudness of sound. Decibels are always ratios between quantities in the form of logarithms. Decibels are the only constant way of measuring sound quality. But even with the knowledge of decibels, the loudness quality has to be based on energy over time. Energy is difficult to measure because of the dissimilarities of meters that are used to measure sound.
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Loudness and metering, just part 1. A must read
The discussion on ductwork noise transmission from Acoustic Fields highlights crucial aspects of HVAC system acoustics. The movement of air…
Great build plans. thank you Denis
You must use absorption. Never place a chair against a wall.
A friend and I built several diffusors using these plans and they turned out absolutely beautiful. Very good instructions and…