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bandpass subwoofer box instructions

Bandpass Designer Software calculates 4th order bandpass theoretical enclosures and boxes.

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

Bandpass Designer is freeware. Download Here.
Sealed Designer is freeware. Download Here.
Vented Designer is freeware. Download Here.


Input Parameters

bandpass 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 manufacture's web site.

Total Q of the speaker
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
Dp:  Diameter of the port(s) in cm
# Ports:  Number of ports

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

  dB increase of the system
S:  Ripple
S = 0.5 - Degraded response pronounced ripple
S = 0.6
- Slightly degraded response slight ripple
S = 0.7 - Best transient response no ripple


MAKE SURE THE UNITS MATCH (e.g. Vas is in liters not cubic feet).

Pmax, Diameter, and Xmax are not required for box calculation.  They are used to determine the power response curve. Vf, Vr, Fl, Fh, Fb, and Lp will still be valid for Qts, Qes, Vas, Dp and number of Ports.

Ported designs require tuning.  Bandpass Designer should give a good approximation of box parameters for most applications.

Use the largest diameter port as the design allows.  Drivers greater than 10" in diameter can produce port noise due to the air movement.

Calculated Parameters

bandpass calculated parameters

The following speaker box and enclosure parameters are calculated:

Vf:  Internal volume of front chamber (port goes into this chamber) in liters.
Vr:  Internal volume of rear chamber (sealed) in liters.
Fb:  Box resonance in Hz
Fl:   -3 dB frequency for the low end roll off
Fh:  -3 dB frequency for the high end roll off
Lp:  Length of port(s) in cm


Fl is an important parameter.  The lower the Fl the deeper the bass.  A Fl below 50 Hz should be suitable.

Vb is the volume of the box.  Generally, the lower the bass the bigger the box.

For Box Calculator instructions go here.

 Subwoofer Main

 Free Download
  Bandpass Designer
  Sealed Designer
  Vented Designer
 Box Calculator

Subwoofer Box Software Downloads for Sealed, Ported and Bandpass
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