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I observed that on low speeds, say below 60 km/h, most noise comes from the engine (and the "sound tube"), paired with some rattles from the suspension. Still, you can comfortably chat with your passenger.
Between 60 km/h and 150 km/h, road surface comes into play. On good roads, you mostly hear the tires, on bad roads you get a cacophony of tires, clicks, rattles and the occasional clunk. Still, the overall volume still allows you to talk to your passenger.
Above 150km/h, the wind noise increases dramatically. I'd say that above 200km/h (yay Germany), you will have to raise your voice considerably to be understood on the passenger seat.
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