-Up to 10 strategically located speakers: Their location and orientation is one of the most important aspects for sound engineers to consider. Depending on the model, there could be between six and ten speakers that deliver bass, mid-range and treble tones. Their definitive position must take into account design as well as safety aspects. But “the design of the grilles, and of course, the layout of the passenger compartment”, also affect sound quality, adds Adrián Mateo, a Car Audio Acoustics engineer at SEAT.
-The quietest room: The anechoic chamber is a soundproof room designed to absorb any sound wave, and is where the sound quality of speakers is tested. Further testing is performed in the electronics lab to validate the radio and amplifiers. These are just two of multiple tests performed on the entire sound system so that no other element, such as dust, humidity or vibrations, affects the sound quality.
-The ‘stage effect’: “We want all the occupants of the car to feel as if they were attending a concert, for example”, points out José Luis. Although not all speakers are located in the front of the car, it’s his job to create that effect. His work consists in using techniques and tools found in concert halls or recording studios. One of these is equalisation, which precisely optimises bass, mid and treble tones. These tests are carried out with different audio sources: radio channel, mp3 or mobile phone, for example. They also use different musical genres, ranging from hip-hop and jazz to instrumental and vocal compositions, to ensure the best possible sound quality all the time.
-Final adjustments, on the road: This same kind of testing is performed while the vehicle is moving on the road so that the engine, among other factors, does not interfere in the sound quality. To ensure this, engineers make their final adjustments while sitting at the wheel, and once again equalise the sound coming from the speakers. “Our ultimate goal is to obtain the most natural sound possible”, concludes Adrián Mateo.
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