The practice began in the auto industry two decades ago but has now extended to other consumer products.
Trevor Cox, professor of acoustic engineering at the University of Salford, said manufacturers realised that you only get one chance to make a first impression
He added: “What manufacturers realised is when you go to see a car in a showroom you don't hear the engine first, what you hear is the sound of the door opening and the sound of the door closing.
“It's a really important first impression sound.”
Car makers realised they had to act when new safety laws forced them to put extra bars in their side doors and the sounds of their doors started to change.
Professor Cox said: “They thought how can we go about re-engineering the sound so its sounds more expensive and more high quality.”