We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

We were driving to a friend's house to celebrate her dad's 92nd birthday. Halfway there, a bright yellow, ground-hugging insect pulled in front of my car from across street. "Wow, that's a Lamborghini Countach!" I exclaimed. You don't often see one of those in my neighborhood—or in any neighborhood.

As Hans Christian Oersted, the Danish physicist and founder of electrodynamics, discovered in 1819, an electric current passed through a wire generates a magnetic field. Place that wire close to a permanent magnet and the interaction of the two fields will generate a force. That, in two sentences, summarizes the operating principle of the motor that energizes every moving-coil drive-unit in millions of loudspeakers worldwide. It sounds simple, but—like everything in audio—it isn't.

As Hans Christian Oersted, the Danish physicist and founder of electrodynamics, discovered in 1819, an electric current passed through a wire generates a magnetic field. Place that wire close to a permanent magnet and the interaction of the two fields will generate a force. That, in two sentences, summarizes the operating principle of the motor that energizes every moving-coil drive-unit in millions of loudspeakers worldwide. It sounds simple, but—like everything in audio—it isn't.