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2/18 port ?
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sn95 View Drop Down
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    Posted: 12 September 2014 at 1:55pm
Is three 4in port,s enough for a dual 18 box to prevent port noise ?'boxing question is 14.5 cuft .
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patryk1305 View Drop Down
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You can always sim it in hornresp and find out :)
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sn95 View Drop Down
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i have winisd but my labtap is not working so i can't sim .
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Elliot Thompson View Drop Down
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No one will be able to answer such a question. You will need to simulate the cabinet, tuning frequency with, the TS Parameters of the driver to get the answer.

Best Regards,
Elliot Thompson
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patryk1305 View Drop Down
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PM ME all the info and I will sim it for you in hornresp if you want :)
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sn95 View Drop Down
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First thank you all for your help . After working on my laptop I got winisd to work .my port velocity is 1.986 m/s peak at 30hz is this low enough ?
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patryk1305 View Drop Down
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Seems VERY low, 10% of speed of sound is acceptable for PA I would say (34m/s).
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sn95 View Drop Down
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Thank you .it looks low to me to looking over my input,s
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The Builder View Drop Down
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Originally posted by patryk1305 patryk1305 wrote:

Seems VERY low, 10% of speed of sound is acceptable for PA I would say (34m/s).


Now that's a useful bit of infoThumbs Up
It just is.
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DMorison View Drop Down
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Originally posted by sn95 sn95 wrote:

First thank you all for your help . After working on my laptop I got winisd to work .my port velocity is 1.986 m/s peak at 30hz is this low enough ?

Far too low to be right, actually.
My 1st guess, you haven't input the actual power you'll be using them at yet, perhaps?
(That looks awfully like the 1W figure, not the 2 or 3 thousand Watts you might actually want to run them at.)
Have a look at the G-Sub on this site - its port is roughly the equivalent of 7, 4" diameter ports.
HTH,
David.
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patryk1305 View Drop Down
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Originally posted by DMorison DMorison wrote:

Originally posted by sn95 sn95 wrote:

First thank you all for your help . After working on my laptop I got winisd to work .my port velocity is 1.986 m/s peak at 30hz is this low enough ?

Far too low to be right, actually.
My 1st guess, you haven't input the actual power you'll be using them at yet, perhaps?
(That looks awfully like the 1W figure, not the 2 or 3 thousand Watts you might actually want to run them at.)
Have a look at the G-Sub on this site - its port is roughly the equivalent of 7, 4" diameter ports.
HTH,
David.

I simmed it for him already, and the port velocity exceeded 107m/s at full power. I also suggested for him to look at the G-sub :)
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sn95 View Drop Down
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Points: 351 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2014 at 4:07pm
Thank,s guys for your help .winisd is sim it at 1 w not at full power that is why it's showing such a low reading .as for the Gsub this is my take on it ,I have changed some of the measurements to better suit the driver I have .later today I will go back to my sim in winisd and reset to get reading at full power and change from round ports to slot .
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