RT60 Too Long? How to Reduce Reverberation Time

Open SonaVyx RT60 tool and measure reverberation time at 3-5 positions in your room. The measurement captures T20 and T30 at each octave band from 125 Hz to 8 kHz. Compare your measured values against the target for your room type. If any octave band exceeds the target by more than 0.2 seconds, treatment is warranted.

Pay attention to the frequency distribution of RT60. Rooms with hard surfaces often have longer RT60 at mid and high frequencies, treatable with thin panels. Rooms with lightweight construction may have longer RT60 at low frequencies, requiring thick bass traps. The measurement data guides your treatment strategy.

The Sabine equation provides the starting point: T60 = 0.161V / A, where V is room volume in cubic meters and A is total absorption in square meters Sabine. To reduce RT60 from the current value to the target, calculate the current absorption (A_current = 0.161V / T60_current), the target absorption (A_target = 0.161V / T60_target), and the additional absorption needed (delta_A = A_target - A_current).

SonaVyx treatment calculator automates this calculation and recommends specific treatment types and quantities based on your room dimensions, current RT60, and target RT60. It accounts for the absorption already provided by existing surfaces, furnishings, and audience.

For high-frequency control (above 500 Hz), 25-50mm acoustic panels with NRC 0.70-0.85 are effective and economical. For broadband control (above 200 Hz), 100mm panels with NRC 0.95-1.10 address the full speech frequency range. For low-frequency control (below 200 Hz), thick corner bass traps (150-200mm or more) are necessary because low frequencies have long wavelengths that require proportionally thicker absorbers.

The absorption database in SonaVyx treatment calculator includes coefficients for 55 materials across 8 categories, enabling accurate prediction of treatment effectiveness before purchasing materials.

Install treatment in this order for maximum impact per dollar: 1) Ceiling panels above the primary use area (largest impact, addresses most reflection paths). 2) First reflection points on side walls. 3) Rear wall treatment (absorption or diffusion depending on room size). 4) Bass traps in vertical corners. 5) Additional panels as needed to reach target.

After each installation phase, re-measure RT60 to verify the improvement and determine if additional treatment is needed. This iterative approach prevents over-treatment and ensures the investment is directed where it has the most impact.