The phrase "poor acoustics" means that a room or space does not have good sound quality, making it difficult to hear or understand sounds clearly. Full definition
Moreover, when they did, their songs exhibited poor acoustic quality. (scientificamerican.com)
In some cases, problems caused by poor acoustic conditions may have been falsely attributed to other factors (teacher performance, socioeconomic factors, etc). (asumag.com)
Poor acoustics in classrooms can directly impact student health and behaviour. (educationbusinessuk.net)