Turbomax Reflex - It begins...

You can set WinISD to display excursion as peak or RMS excursion, id set it to peak as thats your worst case and you measure xmax as a peak value anyway.  Like Ceharden says i wouldn't worry if it gos over a tad, are you inputting real xmax? (coil length-gap height/2) or adding 1/4 of the gap height?, or using a different meathod?  If your using real xmax you should be fine with that sim of the fane. 

You can do a rough impedance plot with 2 multi meters and a sine tone generator/ pc program / rogs test cd.  Run a sine signal into the cab, keep voltage from the amp constant and mesure current drawn by the speaker, then repeat at difference frequencys, calcluate the impedance at a frequency (voltage/current), then plot it on a graph and you have an impedance plot to compare to the simmed one on WinISD.  Thats the best way of measureing the tuning of a cab, and how the port is being lengthnd.

  

Timebomb wrote: You can set WinISD to display excursion as peak or RMS excursion, id set it to peak as thats your worst case and you measure xmax as a peak value anyway.  Like Ceharden says i wouldn't worry if it gos over a tad, are you inputting real xmax? (coil length-gap height/2) or adding 1/4 of the gap height?, or using a different meathod?  If your using real xmax you should be fine with that sim of the fane.  You can do a rough impedance plot with 2 multi meters and a sine tone generator/ pc program / rogs test cd.  Run a sine signal into the cab, keep voltage from the amp constant and mesure current drawn by the speaker, then repeat at difference frequencys, calcluate the impedance at a frequency (voltage/current), then plot it on a graph and you have an impedance plot to compare to the simmed one on WinISD.  Thats the best way of measureing the tuning of a cab, and how the port is being lengthnd.

I just realised this Ive simmed the jobst lbb118 in winisd and was a bit worried if I can give them full 500watts. Had the cone excursion at peak and it was 1mm over xmax,changed it to rms and its well under the line at 500w.