Bandpass Designer Sealed Designer Vented Designer
Instructions:
Bandpass Sealed Vented Example
Box Calculator (Windows):
Bandpass Sealed Vented

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

# Sealed/Closed Subwoofer Instructions

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

## Input Parameters:

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.

## Calculated/Output Parameters:

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