Strutt|Building Acoustics|Quick RT inserts a typical Reverberation Time spectrum directly into the selected row of the current calc sheet. The user specifies the reverberation time at 500 Hz, with guidance of typical ranges of RTs for different types of spaces given by a drop-down list box. The corrections to the 500 Hz RT used by the two spectra options are outlined below (with each value multiplied by the user-inputted value for 500 Hz RT):
1. High Percentage of Masonry/Concrete
| 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1 kHz | 2 kHz | 4 kHz | 8 kHz |
| 1.3 | 1.2 | 1.1 | 1.0 | 1.0 | 0.9 | 0.7 | 0.5 |
2. Substantial Low-Frequency Absorption
| 63 Hz | 125 Hz | 250 Hz | 500 Hz | 1 kHz | 2 kHz | 4 kHz | 8 kHz |
| 0.7 | 0.8 | 0.9 | 1.0 | 1.0 | 0.9 | 0.7 | 0.5 |