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understanding graph in WinISD


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steezs 
Copper - Posts: 172
Copper spacespace
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Location: Canada
Posted: November 04, 2005 at 1:09 AM / IP Logged  
Basically want to know whats a good curve and what the red line means.
the duce
menace2sobriety 
Silver - Posts: 394
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Posted: November 04, 2005 at 1:36 AM / IP Logged  

the red line is a flat response no "peaks" or "dips" and after the response curve crosses the purple line is where the freqencies wont reproduce very well. its a cut off point.

does that help?

steezs 
Copper - Posts: 172
Copper spacespace
Joined: October 30, 2005
Location: Canada
Posted: November 04, 2005 at 1:39 AM / IP Logged  
Some what, so if i decide to make a ported box do i want my curve to have a little hump over the red line like 1 db or stay as flat to the red line?
the duce
menace2sobriety 
Silver - Posts: 394
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Posted: November 04, 2005 at 1:47 AM / IP Logged  

flat= good response. stay as flat as possable.

menace2sobriety 
Silver - Posts: 394
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Posted: November 04, 2005 at 1:48 AM / IP Logged  
i mean smooth response
stevdart 
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Posted: November 04, 2005 at 8:43 AM / IP Logged  

The program will try to produce the flattest response when you input the parameters and click through the dialogue boxes.  But usually this flat response comes at the expense of huge enclosures or unmanageble port sizes.  So keep your install location in mind, as well as the manufacturer's suggested box volume, when you work up a design using the program.  You will almost always have a peak in the response above the 0db (red line) when you design a workable enclosure.

The purple line shows you the F3 cutoff point as menace described.  You have been asking a lot about F3, so there it is.  It's 3 decibels down from 0 on the left column.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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