Dobbs Doherty, Cogent Acoustics, 3D Access and 3D Solutions have come together to form DDEG

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About Us
We exist to use our knowledge of engineering to help our clients achieve their objectives.
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Cogent Acoustics offers a complete range of acoustics and vibration consulting services for projects of all scales.
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We have practised extensively throughout Australia, New Zealand, and have worked on international projects as well.
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Contact us to find out how we have saved clients money, solved their problems or simplified their jobs on projects similar to yours.
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Welcome to Cogent Acoustics

Cogent Acoustics is a specialist acoustics and vibration consultancy firm, based in Melbourne, serving clients Australia wide.


Our award-winning people assist construction industry professionals, manufacturers, government organisations, and other businesses, with acoustics and vibration solutions for a diverse range of projects.


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Why Choose Cogent?

At Cogent we believe a good consultant should make their client’s job easier. With this in mind, we aspire to provide our clients with the best service they can get on the path to achieving their goals.


To succeed in this, we listen to our clients, ask questions until we fully understand their needs, and then frequently communicate with our clients throughout each commission.


We provide our clients with clear, logical advice, tailored to the intended audience. Our advice is presented in plain English and unnecessary technical jargon is avoided.


We pride ourselves on timely deliverables and we keep our clients regularly informed of progress during each project.