Acoustic Calculator

Fifty-two acoustics and audio calculators that show you how they got there. You are standing in the room and somebody asks how much absorption it needs. You can give them a figure in about ten seconds. Then a fortnight later, when the builder asks where that figure came from, you can show them the formula, your own numbers in it, and what it assumed. That is the whole idea. Every calculator here opens onto its own working. WHAT IT COVERS Room acoustics. Reverberation time, how much absorption a room needs and which material will actually do it, room modes, critical distance, NR and NC ratings, speech intelligibility. Systems and rigging. Loudspeaker SPL, amplifier headroom, 70 V and 100 V lines, cable loss, crossovers, compressor settings, gain before feedback, pan law. Propagation. Speed of sound, atmospheric absorption over a long throw, delay times for a fill, comb filtering, Doppler…