Trying to move forward. I have been using WinISD since I gave upon my White and Bullock lookup tables from Speaker Builder year one. It has usually been pretty close for sealed and ported. As BP-alignments are a bit more complex, trying to master HornRes.
So, rather than figure out why measured BP-4 of the RSS Dayton's did not match WinISD, thought I would crawl before running and just model a closed box. Loaded the same parameters ( well, they use different ones, but the same WT-II measurement session) into the two simulators.
I get a match on impedance plot showing tuning frequency does match ( 52 Hz) , but HR is almost double the value. ( 25 Ohms, 42 Ohms)
Shape of acoustic power is basically the same, HR giving me box reflections, but the center of the hump ( The Titanic 10 has a humped response) for WinISD is 110 Hz, and 70 Hz for HR.
Now, tomorrow I am going modify the old box to the parameters I have loaded and measure reality, but I am looking for reasons, what I did wrong, what variables may be different etc. as the difference is huge. WinISD is pretty close to the published graphs. Have I screwed up the parameters in HR?

So, rather than figure out why measured BP-4 of the RSS Dayton's did not match WinISD, thought I would crawl before running and just model a closed box. Loaded the same parameters ( well, they use different ones, but the same WT-II measurement session) into the two simulators.
I get a match on impedance plot showing tuning frequency does match ( 52 Hz) , but HR is almost double the value. ( 25 Ohms, 42 Ohms)
Shape of acoustic power is basically the same, HR giving me box reflections, but the center of the hump ( The Titanic 10 has a humped response) for WinISD is 110 Hz, and 70 Hz for HR.
Now, tomorrow I am going modify the old box to the parameters I have loaded and measure reality, but I am looking for reasons, what I did wrong, what variables may be different etc. as the difference is huge. WinISD is pretty close to the published graphs. Have I screwed up the parameters in HR?
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