\rA sealed enclosure is as it name implies, sealed. A ported, vented, or slotted enclosure has an opening that allows the subwoofer enclosure to push air out of the box. Sealed enclosures are usually tighter and punchier while ported enclosures tend to be louder and boomier. The recommended enclosure volume for a ported enclosure is typically larger than the recommended air volume for a sealed enclosure. Vented enclousres allow you to tune the port to specific frequencies and there are a ton of variable with regards to the port diameter, length, etc. \r