Cox is fascinated by room acoustics, and how places can be designed for intelligible speech (for example, classrooms) and beautiful music (for example, auditoria).
His acoustic designs can be found in rooms worldwide and he has co-authored a research book on absorbers and diffusers which is now in its third edition.
Cox has presented a range of popular science documentaries for BBC Radio 4, BBC Radio 3 and BBC World Service, including Sounds of Science, Aural Architecture, Life’s Soundtrack, Science vs Strad, The Pleasure of Noise, World Musical Instruments, Dragon's Lab, Biomimicry and Save our Sounds.
Since the 1990s, Cox has been communicating acoustic engineering to the public working on projects worth over £1 million.
He was a finalist at Famelab, a ‘Pop Idol’-style competition to find science communicators for television.