Sealed Subwoofer Box Enclosure Design Instructions Speaker Cabinet Program

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Free Downloads (Windows):
Bandpass Designer Sealed Designer Vented Designer

Instructions:
Bandpass Sealed Vented Example

Box Calculator (Windows):
Bandpass Sealed Vented

Subwoofer Box Comparison Calculator:
JavaScript version of all three calculators (Bandpass, Sealed and Vented)

AJ Sealed Designer Software is for designing sealed or closed theoretical enclosures.

The following Theile Small speaker parameters are required for input. These values should be included with your speaker manual or can be found on the manufacturer's web site.

Qts: Total Q of the speaker
Qes: Speaker electrical Q
Fs: Free air resonance of speaker in Hz
Vas: Volume of air equal to the speakers spring characteristics in liters
Pmax: Maximum power of the driver in watts
Diameter: The diameter of the driver in cm
Xmax: The amount of cone movement in one direction in mm

The following speaker parameters are user defined inputs. These values should be chosen by user preference.

Qtc: Total Q of the speaker and box

Notes:

MAKE SURE THE UNITS MATCH (e.g. Vas is in liters not cubic feet).
Qtc: choose a value between 0.1 and 1.5. A value between 0.5 and 1.2 should give good results.
Pmax, Diameter, and Xmax are not required for box calculation. They are used to determine the power response curve. Vb, Fb, and F3 will still be valid.

The following speaker box and enclosure parameters are calculated:

Vb: Volume of box (one to be built) in liters
Fb: Box resonance in Hz
F3: Half power frequency in Hz

Notes:

F3 is the most meaningful parameter. The lower the F3 the lower the bass. A F3 below 50 Hz should be suitable for a sealed enclosure.
Vb is the size (volume) of the box that needs to be built. Generally, the lower the bass the bigger the box.
For Box Calculator instructions go here.

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By Jimmy Raymond

Contact: aj@ajdesigner.com

Sealed/Closed Subwoofer Instructions

Input Parameters:

Calculated/Output Parameters: