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^ quite funny!
Drone is the Intarnet short for "resonance". Go figure!
Or harmonics. When different parts of the engine/gearbox has the same frequency of vibration, it can create a nasty 'humming' sound. In the professional racing and motorsports, this is sorted by damping the pipes/muffler with different thickness and stiffness materials. In some extreme case (some F1), wrapping the headers can kill vibration by more than 25%.
Many ways to get 'drone' sorted.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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