Mazda launched the new Roadster on May 20. One of the developments they made is reverting it to how it originally was when it started–a lightweight sports car. “We really altered it from the third generation model,” said Assistant Manager Yoshihiro Hayashi of the Car Development Department, in charge of the engine sound development.
“The low frequency waves (below 200Hz) of the third model was substantial when the car accelerated. It seemed like a muffled sound, but once released, the sound would become very powerful. Ironically, you could feel its stillness as well. Our aim was to revert the fourth generation model to its original structure, that is being a lightweight sports car, and we worked on the concept of reducing its low frequency,” Hayashi said.
Regarding its difference with the previous models, Hayashi explained, “A good sound quality has a standard range of 315Hz. Therefore, we decided to set it to 315Hz. We incorporated modulation too. The previous models constantly had low-frequency sound, so there was a hum whether or not you step on the accelerator. A mid-frequency sound during acceleration is usually heard, but if the low-frequency sound is eliminated, the former will completely disappear as well. Given that, the sound only comes out or not based on the acceleration G and the driver’s operation. We created that kind of tuning.”
“It has exhaust sound, intake sound and a sound transmitted inside the car by the engineâ€™s vibration. We were able to produce the sound that we aimed by tuning the special features of its bracket and car body. First, we tuned its main silencer, then we also tuned the resonance of its deaf mount bracket using the unit Hz. Moreover, we also adjusted the vibration characteristic of its floor panel. Also to lower its sound, we tuned the vibration frequency of the front glass.” he specifically added.
(Translated by Claire Marie Sausora)