What is the word for how well sounds can be heard in a particular room or hall?

The word for how well sounds can be heard in a particular room or hall is acoustics.

Here's why:

* Acoustics refers to the science of sound and how it behaves in different environments.

* It encompasses factors like reverberation, sound absorption, reflection, and diffusion, all of which influence how clearly and distinctly sounds are perceived in a space.

So, when you say a room has good acoustics, it means the sounds are clear, distinct, and easy to understand. Conversely, bad acoustics would mean sounds are muffled, distorted, or difficult to hear properly.