TOAD Hall Treatment Planning

Before we start installing the panels I've plugged the numbers we got from testing into a couple of handy calculators to see what we should be able to achieve.

Frequency spectrum

This tool models the particular characteristics of the absorption material based on the measured RT60 reverb times.


The 'Reheasal' profile seemed most appropriate. We will still be significantly above the 'Studio' profile so hopefully we shouldn't be too dead (I'm thinking of you 'The Stage'). This is with the 12 Caldera panels installed and the existing carpet on the floor.

Reflection paths

This tool models the sound reflections within a space and how late the reflections arrive at a listener. The source is roughly where the timps are situated and the listening position is in the first violins.

Before (0.2 absorption)

No Treatment

I'm guessing a bit here, but the reflections around 30-50ms late are possibly the ones making it feel a bit muddy in there. The ceiling primary reflections are not shown here are would be around the 10ms after direct sound.

The key thing here is the intensity of the early reflections are all almost as high as the original, and the combination of early reflections arriving will overwhelm the original sound so you are effectivly hearing 50ms behind the beat.

After (0.8 absorption)


With the panels being so effective, if the reflections hit any of the twelve panels then those early reflections will be pretty much removed. The question is whether if we leave the ceiling untreated whether that will be enough.