For most designs that the novice box builder will attempt there are a few I could recommend:. It's a very highly rated, free program for Windows. There is also an online version which isn't as full featured but can be run on any operating system through a web browser. Blaubox click to download - Blaubox has been around forever it seems. Created by Blaupunkt , it's a DOS program which may cause some run problems with the newest 64bit versions of Windows try running it in "compatibility mode".
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. 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. Resonance frequency of the box. Half and low roll off frequencies -3 dB points for both the high and low pass filter.
Port length for a given diameter Frequency - decibel response plot Power response - decibel plot. Bandpass Designer Instructions. Golden ratio of length, width and depth using the Box Calculator function. Half power frequency -3 dB point. Frequency - decibel response plot.
Power - decibel response plot.
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