There's a concept in electrical engineering that I keep coming back to lately. It's called impedance matching. The short version is this: when you're trying to send energy from one system into another — a signal from an amplifier into a speaker, power from a source into a load — the two sides have to be tuned to each other. If they're mismatched, a chunk of that energy doesn't make it across. It bounces back. It reflects. You can have all the pow