LAPD rolls out new patrol cars with low-frequency siren technology FOX 11 Los Angeles 18:58 Thu, 23 Jul
LAPD cars will feature ‘low-frequency’ sirens that drivers can ‘feel’ The Independent 22:13 Wed, 22 Jul Article paywall
New study explains why some people are more sensitive to low-frequency noise News-Medical.Net 05:04 Fri, 10 Jul
