Those experiments showed that spiders could hear even relatively quiet sounds — similar to human conversation — and from several meters (yards) away! (sciencenewsforstudents.org)
As a result of these centralized systems, noise control often is incorporated easily into the systems, providing quieter sound levels for these learning spaces. (asumag.com)
In the first case a high - tech overhead speaker projects quiet sounds and poetic fragments of speech in such a way that it seems as though they are inside your head. (nytimes.com)