Does anyone know how to calculate the response of a driver at a certain frequency? I have made a web based program (behind a firewall or I could show people) that stores the woofer specs in a mysql database, and then when a driver is selected make a jpeg of the frequency response curve. Unfortunately the only data points I know how to calculate are the 12 db slope from the f3 in a .707 Q box, the F3 point, the peak dB point in a Q>.707 box, and the 0 dB reference line for higher frequencies. I dont know how to calculate the slope in a lower or higher Q system tho.. Right now I have 3 straight lines to approximate the curve. I want to improve on this to a curve withot having to dig up my computer graphics books and hard code some NURBS or bezier curves since PHP doesnt hav any curve functions built in.
Anyone have any suggestions?
Also, does anyone know at what frequency the curve gets to the reference level in a Qtc =.707 system? Is it one octave above F3?
Anyone have any suggestions?
Also, does anyone know at what frequency the curve gets to the reference level in a Qtc =.707 system? Is it one octave above F3?
All of the equations are at :
http://www.diysubwoofers.org
What you want are the frequency response calculations, you plot dB vs frequency. The sealed equations can be omitted because the vented box equations with Fb=0 duplicate the sealed box curves.
Have fun
http://www.diysubwoofers.org
What you want are the frequency response calculations, you plot dB vs frequency. The sealed equations can be omitted because the vented box equations with Fb=0 duplicate the sealed box curves.
Have fun
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