Why are Audi R8's equipped with a V10 engine?

I've noticed that most models in the Audi R8 lineup have a V10 engine. What's the reasoning behind this choice and how does it differ from other engine options?

Audi chose to use a V10 engine in the R8 for its superior power, balance, and sound quality. The V10 layout allows for more cylinders and a larger displacement, resulting in increased horsepower and torque. As for sound, the V10 configuration produces a unique rumble that's unmatched by other engines.