Use the logarithmic sinesweep method to measure any room acoustical parameters (RT, EDT, C50, C80, D50) and see what sound asbsorbing material can help depending on the room volume and use.
The application still allows you to use the less precise direct method (baloon pop, clap, pistol shot).
The sinesweep method bypasses many android devices audio limitations, connecting your device to a good sound source and an external microphone you can get quasi-professional quality measurements. Use USB sound sources to have good survey estimates.
This application will tell you in a few seconds if the room you are testing has a sufficient internal acoustics quality checking on its geometrical volume and use, then it will propose a series of counter-ceilings or acoustic tiles to correct the reverberation.
XMAS 2018 DISCOUNT - In 2019 We'll deprecate the simpler Apm tool full 2 version
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