how to calculate resonance peak of H-frame

[thadman]

as the title states, how do I calculate the resonance peak of an H-frame style baffle and how I do calculate the effective baffle width of that H-frame (so I can model it in linkwitz's spreadsheet)?

Also, could I invert mount half the drivers (RS390HF) in the line array to reduce 2nd harmonic distortion without audible penalty (ie basket/magnet assembly interfering with sound waves). They will be covering the low-end to ~250/300hz.

[Rudolf]

The U & H frame woofer worksheet at the FRD consortium does it pretty well. But you would need the MathCad Explorer do work with it.

http://www.pvconsultants.com/audio/boxmodel/uhframe.htm

Results look like this:



To compare that to an equivalent OB you would have to simulate that too. Try EDGE: http://www.tolvan.com/edge/

[JonMarsh]

thanks, Rudolf- you beat me to it, and it's exactly what he needs.

Edge is well recommended for predicting behavior of flat baffles of various shape with different driver positioning, but as you know, watch positioning near edges.