Car Audio Forumz - The #1 Car Audio Forum

Car Audio Forumz - The #1 Car Audio Forum (https://www.caraudioforumz.com/)

- General Discussion (https://www.caraudioforumz.com/general-discussion-10/)

- - ported vs sealed (https://www.caraudioforumz.com/general-discussion-10/ported-vs-sealed-24565/)

ported vs sealed

i know alot of you will think this a dumb question but wat is the diff between ported and sealed like i know as much as holes and no holes but sound reasond like i have a infinity 12 in a ported box wat if i put it in a sealed box whats the diference

Sealed: Smaller box, more "full" sound (in my opinion). Great for SQ.

Ported: Larger box, ports, sound can be tuned to certain frequencies, Great for SPL and can sound GREAT if done right in SPL.

A sealed box is really the simplest type of box to make. Just stay close to the recommended air volume, and you'll get "optimum" sound out of your sub. The air inside the box will act as an extra suspension element for the driver and make for a much more controlled sound. This comes at the cost of low-frenquency sounds. The sub won't play as low as with a ported box. The less air volume in the box, the tighter your sound will be, but, you're always sacrificing lower frequencies.

A ported box on the other hand, will use the port for extra resonnance in it's tuned frequency range. Generaly, this will extend the low frenquency range of your sub, but, since the air moves freely in and out of the box, the sub relies entirely on the amp and it's mechanical suspension elements (spyder and surround) for the controlled movement of the sub. This is why, generaly, a ported (or vented) box won't normaly have as much of a tight/defined sound as in a sealed box. A ported box is a lot more work to get right, it can make or break a sub.

I hope this helps a bit, you can do a search as well, I'm sure the topic's been covered time and time again...

An installer I know told me today about a different type of box. A transmission line or something like that... and, in theory it sounds pretty good, but, if I understood it properly, I'd need something like a 6 c.f. box for a pair of 6¾" woofers. But, It would give the same impact as a pair of 12" subs. But, a pair of twelves would only take up like 2 c.f.... I'll look more into this when I get some time...

Quote:

Originally Posted by sirsleepsalot

since the air moves freely in and out of the box, the sub relies entirely on the amp and it's mechanical suspension elements (spyder and surround) for the controlled movement of the sub.

The port resonates in phase with the driver at the tuning frequency, providing the extra SPL at and around that frequency. Because the port's resonance is in phase with the driver, the driver moves very little.

Below or above that range, however, you are right in that the sub moves as if it were in freeair, although it's not *quite* as if it were in free air.

True... I forgot about the fact that the resonnance frequency was it's point of highest effeciency...

I've been up for 20 some hours... gimme a break ! :P hehe
But, thanks for the clarification...

there are also Bandpass Enclosures , i had one that worked awesome until the Plexiglas cracked and haven't gotten a new piece also its for duel 10" and i have a 12" now

it sorta depends on application

Other than what has been said, contrary to popular belief ported boxes are not better for low end. large sealed boxes will hit the lows the best right down into the subsonic (<20hz) and play fairly flat as well to boot.

OMG.. hide this post before Dukk see's it..

....but it was too late.... :sly:

I see the SEARCH feature has been mentioned.. :ohwell: