I'm taking a stab in the dark, since there's no question posted here....maybe the server problem.

Anyway - no such thing as sealed box "tuning" per-se.

Ported enclosures are tuned based upon airpsace and port volume and length. This results in a boosted output around the tuning frequency.

Sealed box frequency reproduction is basically based upon airspace, and nothing else. As a general rule, the larger the airspace, the lower the "tuning" - but sealed enclosures have a much flatter response across the frequency range. This is why they are generally considered a setup for sound quality, and not SPL. Increasing the airspace doesn't really change the "tuning" (because there is none), but it can allow the sub to extend into a lower range that a smaller enclosure doesn't allow. Sometimes at the expense of the higher frequencies, sometimes not - depends on the sub.

All of this does reach a point of diminishing returns however - as box size increases, it eventually starts to act like a free-air install, which not every sub is recommended for. Too small an enclosure chokes the sub, and output can be greatly reduced across the frequency range, especially in the low end.

For the most part, for some more low-low end, increase the box size a bit - if the manufacturer lists a range of 1 to 2 cu/ft sealed for example, 2 cu/ft will have a bit better low-end extension, while 1 cu/ft will be tighter bass, with a little less bottom end and maybe a touch less output.

Hope this answers your non-existant question ;)

~HH

I don't know about you and what kind of speakers you have but when i got my JL audio 12" subs it came with direction that gave you the exact dimensions of the sealed and these dimensions are the most optimal for that sub.

Agreed - most subs come with recommendations. But these are based on the opinions of the manufacturer as to what sounds best, or mathematical models (like WinISD Pro) that plot the proper box size for the flattest frequency response. Not saying that they are not optimum - the recommended box size is usually the best way to go - but sometimes, personal preference in sound means increasing or decreasing the box size yields good results. People frequently exceed the recommended box sizes for a bit more low end.

~HH

usually the listed box size is the way to go. A sealed box can be tuned in many ways, the shape of the box, the density of the wood(or material used to make it), where the sub is located in the box and ect... Bass works on reflection, not line of sight. Best thing is can say is when getting a box, use a high density material to create it. Place the sub in many different parts of truck in many different directions for maximium tuning. Acustics do play a role in tuning a speaker also. one box might sound good in one vehilce but crap in another. And make sure if its a sealed inclosure that it is sealed.

polyfil also slows the sound waves down making the sub sound deeper and louder. If you can get the PERFECT square box, than it would be louder than some else, b/c the flection wave would not cancel out the sub but amplafly the sound even bigger.


hey blue, are you just coping what the manufactor said or do you actually know something about sound like me:) no offence at all, i'm just trying to find sound engineers like me.

i'm running out the do to work so i'll explain more later. bass work on reflection, that why when designing studios acustics play a big role, and thats why the room look really funny. When a wave reflects off a wall or surface it is one of 2 waves, its either a destructive wave or a amplafied wave(yes i can't spell). If you can get the wave to hit the back of the sub just right, it would be like adding more power from an amp. kinda like making waves in water, if 2 waves hit each other, they either cancel each other out makes a flat wave, or magnify each other and make a really huge wave. That why most studio equipment is in a square box. I'll explain more when i get home. But in car audio, its kinda just mix and match til you find something that sounds good.

Yea, server problem.
What i was thinking was taking a sealed box and adding something dense and solid inside of it to decrease the interior space of the box, making it a smaller box inside.

But it will do the same thing as moving to a smaller box right?

Thats all that i was asking.
Just something i've been wondering about. Not really considering just wondering.