Who we are

Marshall Day Acoustics is one of the world’s leading firms of acoustic engineers, providing the highest standard of specialised acoustic consulting services to our clients.

For over 40 years, we have been providing innovative acoustic designs for small developments to very large-scale infrastructure projects in over 15 countries and counting.

We provide architectural acoustics and environmental noise and vibration consultancy to a range of industries and sectors including commercial, construction, education, transportation, energy, oil & gas, mining & resources, industrial, community, medical, aviation, government and defence.

With over 100 professional staff in offices across New Zealand, Australia, France, China and Hong Kong, our team has a breadth of knowledge and experience to consistently deliver quality solutions for projects, no matter how large or small. Our strength in acoustic design comes from the diversity of our team members who have been drawn from engineering, architectural, musical and academic backgrounds, with a shared passion and commitment to deliver technical excellence in all areas of acoustics and vibration.

Our company philosophy, technical resources and uniquely creative working environment result in an enviable level of staff retention that provides our clients with stable and committed project teams.

Marshall Day Acoustics was formed in Auckland, New Zealand by Christopher Day and Sir Harold Marshall in 1981, with Peter Fearnside becoming the third partner and founding Marshall Day Acoustics in Australia in 1987.

Many of the technical innovations and industry-leading acoustic design tools for which Marshall Day Acoustics has become widely respected have been led by Keith Ballagh, who became a partner in 1990.

From our beginnings as a local consultancy, we have carefully evolved into one of the largest acoustic engineering consultancies worldwide.