The roar of a motorcycle engine when revved is often a vibrant and dynamic sound, often described as an "echo" or "whirr". This is a result of the powerful engine, creating a feeling of power and speed. This sound is often accompanied by a low rumble as it isolates the frequency range, creating a harmonious and enjoyable sound. For many, this sound is a symbol of the freedom and excitement of riding a motorbike on the road.