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WinISD, ported designed box


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astro88 
Copper - Posts: 195
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Joined: December 01, 2003
Location: Canada
Posted: November 12, 2006 at 7:40 PM / IP Logged  
Ive calculated my parameters and came up with a plan for a ported box but all i need to know is,
Is the port displacement calculated by the program or do i have to do that myself?
Like do i just build the box to the size i came up with or do i add port displacement to the total?    .....Sorry first ported design(i wanna do it right)
TIA
aznboi3644 
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Joined: May 01, 2006
Location: United States
Posted: November 13, 2006 at 4:34 PM / IP Logged  
port displacement is not acounted for...you must add it into the total volume
astro88 
Copper - Posts: 195
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Joined: December 01, 2003
Location: Canada
Posted: November 13, 2006 at 8:42 PM / IP Logged  
how do i figure out port displacement?
stevdart 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
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Posted: November 13, 2006 at 8:49 PM / IP Logged  

If it's a cylindrical port, use the calculator found over to the left side of this page under "woofer calculators", tube/cylinder volume calculator.  Measure the total width of the outside dimensions of the port and enter that as diameter, then enter 0 as thickness.  This keeps you from having to measure a thin walled port thickness.  Decide on what you will use for a port and get the necessary measurement.

If it's a slot port, decide how you are going to incorporate it into the box.  Anything you use to build the port that is in addition to the box, as well as the air volume inside the port, is figured as port displacement.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
astro88 
Copper - Posts: 195
Copper spacespace
Joined: December 01, 2003
Location: Canada
Posted: November 13, 2006 at 9:12 PM / IP Logged  
thanx much!
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: November 13, 2006 at 11:26 PM / IP Logged  
Um...just use a simple math formula for Volume....basically base times height

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