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 Saturday, December 15, 2018 773 users online

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Check if your speaker is suited for use in a sealed or vented enclosure

 Driver's Resonant Frequency (fs) : * Hz Qes : * EBP = * required fields

 Please select : * choose Inch cm Height : * Inches cm Width : * Inches cm Depth : * Inches cm If the above dimensions are OUTSIDE dimensions, enter the thickness of the wood below. Wood Thickness : * Inches cm Speaker Displacement : Ft3 Liter * required fields
 Gross Box Volume = Ft3    Liter Net Box Volume = Ft3    Liter

Please choose (cm or inches) : *

Height : *  Inches cm
Width : *  Inches cm
Depth1 : *  Inches cm
Depth2 : *  Inches cm

If the above dimensions are OUTSIDE dimensions, enter the thickness of the wood below.

Wood Thickness : Inches cm
Speaker Displacement : Ft3 Liter

 Box Front Angle = Degrees Grad Gross Box Volume = Ft3 Liter Net Box Volume = Ft3 Liter

 The angle at the top and bottom of the enclosure (inside) is: 180° - 'Box Front Angle'. If the Box Front Angle is 24 degrees, the inside angle is ( 180° - 24° ) 156 degrees.

This calculator will calculate the proper port length for a given box volume at the desired port tuning frequency.

This program automatically subtracts the port volume from the internal box volume. You can not have a port length shorter than the thickness of the wood that you're using.

The port length must be short enough to allow a clearance of the port's diameter between the end of the port and the wall of the box. If you're using a 3 inch port, allow at least 3 inches between the back end of the port and any wall of the enclosure.

If the port length is negative, the tuning frequency needs to be lower or the port diameter needs to be smaller.

If you want to use square ports, use a port who's height multiplied by its width equals the 'port area' on the calculator. The port length will be the same as the round port.

If you have or need an enclosure with all right angles (no slanted sides) set depth 1 and depth 2 to the same value.

## Error messages

'Gross' volume is the internal volume of the enclosure before the port volume is subtracted. If you're using external dimensions and you set the wood thickness to something other than '0', the wood thickness will be subtracted.

'Net' volume is the internal volume after the port volume is subtracted from the gross volume.

Calculate vented enclosures
Height : *  Inches cm
Width : *  Inches cm
Depth 1 : *  Inches cm
Depth 2 : *  Inches cm

If the above dimensions are OUTSIDE dimensions,
enter the thickness of the wood below.

Wood Thickness : Inches cm
Speaker Displacement : Ft3 Liter
Port Frequency : * Hz
Port Diameter : * Inches cm
Number of Ports : *
Sq. Port Ratio H:W = 1:*

Calculations:
Box Front Angle 1 =  Degrees
Gross box volume = Ft3 Liter
Net box volume = Ft3 Liter
Port Length = Inches cm
Port Area = Inches2 cm2
Port Volume = Ft3 Liter
 Square Port Dimensions: Height = Inches cm Width = Inches cm

 The angle at the top and bottom of the enclosure (inside) is: 180° - 'Box Front Angle'. If the Box Front Angle is 24 degrees, the inside angle is ( 180° - 24° ) 156 degrees.