Before and After Acoustic Treatment: Measuring the Difference

Acoustic treatment is an investment, and like any investment, you want to verify the return. Subjective impressions ("the room sounds better") are valuable but imprecise. Measurement provides objective proof that the treatment achieved its goals, identifies areas where further treatment is needed, and documents the improvement for clients or stakeholders.

Measurement also prevents over-treatment. Without data, it is tempting to keep adding panels until the room feels dead. With measurement, you can see when RT60 reaches the target range and stop, saving money and preserving the natural acoustic character of the space.

RT60 across octave bands (125 Hz to 8 kHz) is the primary metric for reverberation control. Capture T20 or T30 at 3-5 positions in the room using SonaVyx impulse response tool. The average across positions gives a representative room value.

Frequency response at the primary listening position shows how treatment affects the spectral balance. Bass traps reduce low-frequency peaks, while broadband panels smooth the mid and high-frequency response. Overlay the before and after traces to visualize the improvement.

STI at the farthest listener position quantifies speech intelligibility improvement. Even modest RT60 reduction can produce significant STI improvement, especially in rooms that were close to the 0.50 intelligibility threshold.

A 15 square meter home studio with drywall construction typically starts with RT60 of 0.8-1.0 seconds and significant room modes between 60-200 Hz. After treatment with corner bass traps and first reflection panels (approximately 10 square meters of treatment), RT60 drops to 0.3-0.4 seconds and room mode peaks reduce by 5-10 dB.

The frequency response flattens from plus or minus 12 dB variation to plus or minus 4-6 dB, and the stereo image sharpens noticeably. The total material cost for DIY treatment is typically $300-500.

A 200 square meter worship space or conference room with hard surfaces typically starts with RT60 of 1.5-2.5 seconds. Ceiling treatment with acoustic panels (20-30 square meters of NRC 0.85 panels) reduces RT60 to 0.8-1.2 seconds. STI improves from 0.35-0.45 (Poor-Fair) to 0.55-0.65 (Fair-Good).

The improvement in speech clarity is dramatic and immediately noticed by the congregation or meeting participants. The treatment cost is typically $5,000-15,000 including professional installation.

Before installing treatment, capture baseline measurements at all positions you plan to monitor. Store the traces and export the data. Take photos of the room to document the untreated condition. Run SonaVyx RT60 measurement at 3-5 positions and record the results.

After treatment installation, repeat exactly the same measurements at the same positions with the same microphone placement. Open the SonaVyx before-after comparison tool and load both datasets. The tool automatically calculates improvement metrics including RT60 reduction per band, frequency response flatness improvement, and STI change.

Export the comparison report for documentation. This report provides compelling evidence of treatment effectiveness for clients, building managers, or church leadership who approved the investment.