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Old 04-23-2004, 04:15 PM   #1
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A (probably) stupid sub mounting question...

So I see a lot of info on box specs for Subs, sealed and ported. However, I also see plenty of installs in mags of subs installed without boxes, (like face down in a fiberglass center console, like in the latest Alpine mini or Audiobahn "demo" cars) So what happens if you install a sub in openspace in your trunk?

As an example, I build a metal frame to mount the sub, but it is just that, a frame. and mount it in the trunk, what will happen to the sound quality, and why?

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Old 04-23-2004, 05:55 PM   #2
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Nope not stupid. I don't know the whole answer but part of it is that the sub depends on pressure to damp or control the movement of the sub. Otherwise it will self-destruct. That's why a sealed box can handle more power than a ported box because the internal pressure creates an opposing force. That's also why sealed boxes aren't as efficient as a ported box.
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Old 04-23-2004, 06:13 PM   #3
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I'm not positive but I think when they do a down firing sub there is still a sealed box its just the box is in front of the sub instead of behind it. Ported boxes have a tendency to have more of a boomy type sound. They aren't as tight as a sealed box but def louder. I think we need a professional on this topic.

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Old 04-23-2004, 07:07 PM   #4
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Each sub will have an optimum mounting type, free-air (what you asked about), sealed or ported. Typically ported is louder, more efficient but is not as tight of sound. Sealed usually provides the tightest sound. Free air has the most flexible install but usually sounds the most muffled. I personally hate free air and really like tight sealed enclosure subs. Every sub should state the optimum install options. For example size of box, size and lenght of port. The most important thing is to match the enclosure and the sub. There are many subs that don't perform well in free air installs and there are a wide variety of similar size subs that have very different enclosure sizes.
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Old 04-24-2004, 09:44 PM   #5
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The subs still face into a sealed enclosure of the appropriate dimensions. Most serious subs cannot be run w/ any significant power in a free-air situation because, in a sealed box for example, the air pressure involved w/ a sealed box helps to keep the sub physically intact.
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