DLHgn Posted June 23, 2016 Report Posted June 23, 2016 So i've been playing around with WinIsd and noticed that with the same Port Area Port Tuning Subs Power But different Net volume My port air velocities have been changing. The larger the volume, the higher the velocity. Is this because it is automatically changing the length of the port to match the tuning or is there an underlying property i'm not aware of?
DLHgn Posted June 23, 2016 Author Report Posted June 23, 2016 What I did with this picture is make both of the port lengths pretty much the same (roughly 28" long) and kept everything else the same as before (obviously aside from tuning) and as you can see, it is still higher. Why is this?
Joe X Posted June 23, 2016 Report Posted June 23, 2016 So check driver excursion for different box sizes and see how it correlates with port airspeed.
DLHgn Posted June 23, 2016 Author Report Posted June 23, 2016 Oh ok, I see. The blue line has overall higher excursion and especially at the tuning point but how does the excursion correlate with the port speed? Because the peak air speed is only about half of the maximum excursion.
Joe X Posted June 23, 2016 Report Posted June 23, 2016 Here's the relationship: Vent airspeed = volume velocity / port area
Triticum Agricolam Posted June 24, 2016 Report Posted June 24, 2016 Larger ported boxes produce more gain (output) around tuning. More gain = more energy. More energy through the same port area = higher velocity. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
DLHgn Posted June 24, 2016 Author Report Posted June 24, 2016 Larger ported boxes produce more gain (output) around tuning. More gain = more energy. More energy through the same port area = higher velocity. Oh ok, that makes sense. So, what is gain in this application? I notice that on the gain graphs the highest level is still in the negatives. Is this normal or did I do something wrong with the program/design?
Triticum Agricolam Posted June 24, 2016 Report Posted June 24, 2016 Larger ported boxes produce more gain (output) around tuning. More gain = more energy. More energy through the same port area = higher velocity. Oh ok, that makes sense. So, what is gain in this application? I notice that on the gain graphs the highest level is still in the negatives. Is this normal or did I do something wrong with the program/design? That graph is more of a relative measurement. The output numbers don't really matter, its the shape of the graph that is important. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
DLHgn Posted June 24, 2016 Author Report Posted June 24, 2016 That graph is more of a relative measurement. The output numbers don't really matter, its the shape of the graph that is important. SO what would be the "ideal" shape of the curve?
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