Bass reflex speaker cabinet and car: what they have in common

1. Step 1. Bass reflex speaker cabinet — is part of — Subwoofer. A ported enclosure boosts the bass.
2. Step 2. Subwoofer — has part — Permanent magnet. A magnet system moves the cone.
3. Step 3. Permanent magnet — is part of — Speedometer. A rotating magnet drags the needle.
4. Step 4. Speedometer — is part of — Dashboard. A speedometer.
5. Step 5. Dashboard — is part of — Car. Gauges.

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