Sealed vs Ported vs Loaded Enclosures: Picking a Sub Box and Size

The box matters as much as the sub. The same woofer can sound tight and punchy in one enclosure and loud and boomy in another. Here is what each type does, and how we help people pick a size.

Sealed boxes: tight and accurate

A sealed box is airtight. The air inside acts like a spring that controls the cone. That gives you fast, tight bass that follows kick drums and bass lines accurately.

Sealed boxes are also smaller for the same sub. The tradeoff is efficiency. A sealed sub needs more amp power to get as loud as the same sub in a ported box. If you listen to rock, country, or anything with fast double-kick, sealed is a safe pick.

Ported boxes: louder low end

A ported box has a vent tuned to a certain frequency. Around that tuning point, the port adds output, so you get more volume per watt. That is why most hip-hop, cumbia and banda rides use ported boxes.

Ported boxes are bigger and need to be built to the sub's specs. Below the tuning frequency, the cone is less controlled, so you do not want to feed it huge power at very low notes. A good ported box is tuned for the music you play.

Loaded enclosures: the simple route

A loaded enclosure comes with the sub already mounted in a box designed for it. You skip the guesswork. The JL Audio HO110-W6v3 pairs a 10W6v3 with a slot-ported wedge box built for that driver. The Kicker 48CDF104 is a down-firing 10 that leaves the top of the box flat, so you can still stack groceries on it.

For most daily drivers, a loaded box gets you 90 percent of the way there. Custom boxes make sense when space is odd, like behind a truck seat, or when you want to squeeze out every bit of output.

10, 12 or 15 inch?

Bigger is not always louder in the real world. A 10 moves less air, but it is quick, fits in small trunks and under seats, and is easy to power. A 12 is the all-around pick. It fits most trunks and gives deeper, fuller bass without needing a monster amp. A 15 needs a big box and real power, and it shines on the lowest notes.

Think about space first, then power, then taste. A good 12 like the JL Audio 12W1v3 or the Kicker L7S 12 in the right box will outperform a cheap 15 in the wrong one. Match the sub's impedance to your amp too. Dual voice coil subs can be wired different ways to hit the load your amp likes.

Tell us about your car and your music

Trunk space in a sedan is not the same as a crew cab. Tell us the year, make and model and what you listen to, and we will show you options in the shop. We install in our own bay, and gear we sell and install gets lifetime labor plus the manufacturer warranty.