Sound quality design
Reverberation time T60 is when the indoor acoustic field reaching steady state, the sound stops, then the time of the sound pressure level decay by 60 dB. It is one of the most important objective evaluation for room acoustics.
Small room designed in 8 – 11 square meter, middle room designed in 15-18 m2, Big room in 24-30m2, extra large room in more than 55 square meter is better. The capacity of rooms is not too large, so according to rooms size, Reverberation time is between 0.5 and 1.0s