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Old 10-30-2013, 09:42 AM
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Default Box Volume Effects on Equipment and Sound

OK I was wondering what kind of effects box volume would have on a subwoofer and output. So a manufacture would suggest lets a minimum ported volume of 1.5cft and max of 2.5cft for the sake of argument the tuning will remain the same in every scenario. So if you made a box with volume of 1cft which is below the recommended specs, what effects would this have on output and the sub? Now lets say you made a box with volume of 3cft, what effects would this have? I already know that the smaller boxes will handle more power than the larger ones. Which scenario would give more output on the same power? Which setup would be safer on the woofer? Any info would be very helpful.
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Old 10-30-2013, 10:11 AM
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I've wondered the same..

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Old 10-30-2013, 06:11 PM
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So no love for a pretty legit question.

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Old 10-30-2013, 06:20 PM
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generally the larger the enclosure the more efficient it is. GENERALLY
so with 1000w it coul be louder then the 1cf enclosure with 1500w
when you have a smaller enclosure it will control the cone better so it may now need say 3000w to reach xmax when with the larger enclosure you could reach xmax with only 1500w
these are just examples. so the larger the enclosure the less effect the enclosure has on the cone. until you get to around 10xVAS which is considered infinite baffle and all the cone control is done by the subwoofers suspension.


1) efficiency
2) bandwidth
3) small space

Pick two
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Old 10-31-2013, 04:52 PM
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So what gives the larger bandwidth?

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Old 10-31-2013, 05:17 PM
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a larger then normal enclosure will usually have greater efficiency (louder) and better bandwidth (play a wider range of frequencys)

but like many spl "burp" boxes, they are small and efficient, but they wont play from 20-80hz very well.

there are trade offs with every enclosure
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Old 10-31-2013, 07:23 PM
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"Space makes bass"

Larger boxes are generally more efficient, have less rise have, better low end extension and are "flatter".

Smaller boxes can take more power, but that's because they're not as efficient. Small boxes can also be very peaky (not flat). The peaky part is why SPL boxes are so small.

Study the attached pic. See if you can guess which is a "properly" sized enclosure, which is the one that's small and which is the larger one.
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File Type: png big small.png (7.1 KB, 28 views)
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Old 10-31-2013, 07:32 PM
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I assume the middle graph is what you want

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Old 10-31-2013, 07:41 PM
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Quote:
Originally Posted by tntahoe View Post
I assume the middle graph is what you want

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Personally... I'd want the leftmost one. That's the box 50% larger than "recommended".

The middle one is optimum, the shallow response one is the 50% smaller than optimum. You can see the slight peak in the middle of its response. The smaller you go with that box, the more pronounced that peak will get.

At some point, you'll get too big and you'll lose control of the sub though. Basic models can only tell you so much. Some software can predict how much power a sub will take to reach xmax. That's useful to know depending on your setup and when you can get it to max output.
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Old 10-31-2013, 08:01 PM
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Yeah I have no clue how to tell when I sub reaches xmax and im sure I don't want to exceed it either. The graph looks like it is from winisd, which graph is that the gain or spl?

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