How much the reverberation time decreases with a suspended Troldtekt ceiling

The example below shows the reverberation time in the same room with and without a suspended Troldtekt acoustic ceiling. The reverberation time decreases from an average of 4.69 seconds to 0.48-0.53 seconds after installation of the suspended Troldtekt ceiling with a mineral wool backing. The lower reverberation time creates the best possible conditions for both conversations and quiet concentration.