Source google image: https://www.researchgate.net/profile/Brian_Mace2/publication/291150490/figure/fig4/AS:667841510535181@1536237232585/Engine-noise-for-set-A3-petrol-307-vehicles-at-one-interior-microphone-position-for-2.png
Schema electrique 307 phase 2
Source google image: https://www.researchgate.net/profile/Brian_Mace2/publication/291150490/figure/fig4/AS:667841510535181@1536237232585/Engine-noise-for-set-A3-petrol-307-vehicles-at-one-interior-microphone-position-for-2.png