Bass reflex speaker cabinet and LIGO: 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 — Magnetron. A magnet makes the electrons spiral.
4. Step 4. Magnetron — uses — Vacuum. It works in a vacuum.
5. Step 5. Vacuum — is used in — LIGO. 4 km vacuum tubes.

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