JavaScript version of all three calculators (Bandpass, Sealed and Vented)

AJ Vented Designer Software is for designing vented or ported 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
- Dp: Diameter of the port(s) in cm
- # Ports: Number of ports

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

QB3: Slightly degraded response, Small enclosure, Lower F3

SC4: Degraded response, Large enclosure, Low tuning frequency

- Alignment: Choose desired alignment

QB3: Slightly degraded response, Small enclosure, Lower F3

SC4: Degraded response, Large enclosure, Low tuning frequency

Notes:

- 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. Vented 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.

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
- Lp - Length of port in cm

Notes:

- F3 is the most important parameter. The lower the F3 the lower the bass. A F3 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.

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By Jimmy Raymond

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