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| Vented Box Calculator determines the internal dimensions
for a sealed speaker enclosure. It can solve the box dimensions
in both unconstrained (Golden Ratio) and constrained modes.
Notes Before Using Box Calculator
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One of the faces of the enclosure will need to
have enough surface area so the speaker and ports (vented and
bandpass) can be installed. For example, a 15" driver
will not fit in an area (Width X Length) of 10" X 10".
The speaker's diameter is too large. Dimensions
will need to be constrained to make the driver/ports fit into
the box. |
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When designing a vented or bandpass enclosure note the length
of the port. Port length can become too long when using
large diameter ports. For example, a 24" port will
not fit into a 10"X10"X10" box. It will
stick out of one of the sides. If this occurs, constrain
dimensions. |
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Try not to place the speaker on the very edge of the enclosure.
If possible, keep the speaker and ports three to four inches
away from the edges and walls. |
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In summary, plan where you are going to place your speakers
and ports. It's no fun to find out three hours into a
building a box that your speaker will not fit. |
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Unconstrained Dimensions
The Unconstrained mode determines the optimum dimensions (length,
width, and depth) for a particular volume. The optimum volume
is also known as the Golden Ratio. The Golden Ratio reduces
or cancels out the standing waves inside an enclosure which improves
sound quality and reduces distortion. Not all enclosures can
be constructed to the Golden Ratio because of speaker/driver dimensions
or vehicle room (see the Constrained Section below).
Parameters:
| Vb: |
Box volume |
| Addl. V: |
Additional volume |
| Port Volume: |
Port volume |
| Total Volume: |
Volume of the box, port and additional volume
added together. Determined when the Calculate button is
pressed. |
| Length: |
Length dimension |
| Width: |
Width dimension |
| Depth: |
Depth dimension |
Instructions:
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Determine the volume of the box |
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Select Box Calculator from the Box Calculator menu |
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By default, The Golden Ratio dimensions will be calculated.
Note how box and port volumes from the previous screen are transferred
to the Box Calculator screen |
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Enter any additional volume. Additional volume will
include any space taken up by the speaker structure, braces,
or anything else that takes up space in the enclosure |
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Ensure all the Constrain check boxes are not selected |
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Click the Calculate button to determine the dimensions. |
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Constrained Dimensions
Checking the Constrain check box next to a dimension will set or
hold dimensions to a set value. The unconstrained dimensions
will be calculated. When constraining one value, the other
two dimensions will be calculated as close to the golden ratio as
possible. When constraining two values, the other dimension
will be calculated without regard to the Golden ratio.
Instructions:
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Determine the volume of the box |
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Select Box Calculator from the Box Calculator menu |
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Enter additional volume value. Additional volume will
include any space taken up by the speaker structure, braces,
or anything else that takes up space in the enclosure |
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Select dimensions to constrain. |
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Enter new values for the constrained values. If a dimension
is constrained, a new values should be entered |
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Click the calculate button to determine the unconstrained
dimensions. |
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