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Whats the real difference between ported and sealed boxes and what does it mean for me?

  • I currently have a JL 13w7 in a ported box being pushed by a jl 1000/1 amp. I have read over and over again that sealed boxes give more SQ and ported boxes play louder. If I were to switch to a sealed box, what is going to be the noticible difference. I dont do spl competitions. I noticed that in some rap and r&b songs the bass note is really weak when the note is really low or really high. Will a sealed box help this. How much of the loudness wil I lose? I will gladly give up some of the loudness for a higher range of notes. This is in the back of an SUV so the sound is not effected by a trunk. I have been told these are really good SQ subs so I would think they should be able to play the low and high notes pretty solidly. Any help with this is appreciated. I already know ported is louder, sealed is SQ so dont answer with just that basic response. Thank you all for your help. Wanted to get some info before I spend more money.

  • Answer:

    70% of your sound of your subwoofer is due to the design and build quality of your sub enclosure. When picking a subwoofer box, deciding to either go sealed or ported will determine how your system will sound. Sealed subwoofer boxes tend to be much smaller than ported enclosures, since they use the air inside the box as a spring for the enclosure. If you don't have much space, it would be a good idea to go with a sealed box. Not only is there a size difference, but there's also a difference in sound compared to a ported box. Generally the larger the box gets the lower the tone of bass is achieved. However if the box gets too large the "spring" effect that the air creates may be lost losing on loudness and crispness. Sealed enclosures produce tight, accurate bass and have a flat frequency response curve. They are the enclosure of choice when quality is the ultimate goal of the system set up. Ported subwoofer boxes can get very large and have many varying factors that will determine their size and bass output. For example the port has to be relative in size to the boxes volume depending on how much loudness vs qulity is desired. Ported enclosures create louder bass than sealed enclosures, and allow you to tune the box to a specific frequency to determine how the bass will sound. Higher tuning on a ported box will get louder, but you will ose on sound quality. Lower tuning will still get louder than a sealed box, and at the same time deliver good sound quality. Generally this is a box for a set up where "boom" is the ultimate goal. Port area plays a major role in these types of enclosures. Too little a port area can result in port noise, which can severely detract from the sound quality. However, if your goal is to get loud bass and you don't care too much about the sound quality, a ported box, tuned high, with a large amount of port area is the way to go.

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They've explained it well enough. You'll get way better SQ by switching to sealed. Either way the box MUST be built to the internal volume recommended by the manufacturer. You can put a cheapo-crap sub in the manufacturer's recommended box size and it WILL outperform even the best top of the line sub in a non-optimized enclosure. Period. Was the ported box you have now built by JL's specs? If not, this is the problem. I use nothing but sealed boxes, I like SQ. Good Luck!

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sparky3489

Difference: Ported uses the air out of tubes (ports) to direct the lower range sound (and air). As the speaker moves in and out, the air is forced out the ports. Sealed: no air leaves the box. Sound quality is determined by the baffles in the box (the way the air is moved within the box). A ported enclosed is easier to power, yet the sound is not as clear. Chance of blowing a speaker is also greater. A sealed box will provide a more firm/crisp sound/tight sound, but the speaker must be of better quality AND it requires more power. Not just that, the amp must be able to handle the extra work. In short, a ported box setup will provide loud sound at a cheap price. A sealed (or even bandpass box) will provide better sounds, but at a greater cost.

G L

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