I guess that what you are missing is that hornresp initially shows the output from the driver, without the output from the port.Hi Everyone,
I'm beginning with Hornresp, trying different things.
When simulating a Bass Reflex and comparing the result with WinISD's (to be sure I'm doing ok), I don't get the same response... Could you tell me why ?
I model the same box with the same vent and get two different Helmoltz freq and two different response curves...
In HR, I did it with the Loudspeaker Wizard (wonderful feature by the way !!)
Perhaps all of this is already explain in this tread, but there's # 2000 messages ! If so tell me where !
What I am looking at is a quarter wave pipe (TL) with several identical drivers distributed along a portion of the pipe, not for smoothing necessarily but for convenience sake. I realize that HR can not simulate this directly (nor would it be reasonable to rewrite it to handle it) but what I am wondering is if one could not get a close enough approximation of the total response by simulating each position and averaging the results.
I guess that what you are missing is that hornresp initially shows the output from the driver, without the output from the port.
To see the overall system response you need to select the combined response from the tools menu in the SPL window.
I'm taking about the combined response. It doesn't look like the WinISD's. For the close box, it's close but not the same, for the BR it's sometimes far away, specially for the low part.
Can you please post a screenprint of your Hornresp input parameters window, and also provide details of the WinISD Driver, Box and Vent values you are using for the purposes of the comparison. Thanks.
Your AP figure is incorrect.
The AP Parameter is the cross sectional area of the port.
For a 10.2cm diameter round port this would be radius squared X pi = 81.71 sq cm.
here they are.
..The following changes are required to the Hornresp input parameter values to make them equivalent to the given WinISD values.
and of course the SPL response looks a bit different than with your numbers... How did you get them ?