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Old 04-06-08, 10:16 PM   #8 (Link)
 
brucek
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Re: Wierd Null


Quote:
I was just wondering what might cause my dip at 140 and that happens not matter which mike or software I use. I was also wondering how to track it down.
A calibrated mic and the use of standard scaling helps with accuracy and proper interpretation.
A change to LOG scale from the LIN scale you're using will change the look of the dip quite a bit, (although of course it won't get rid of it).
Best to do your testing at 75dBSPL rather than such a high level.
Use a vertical scale of 45dB-105dB and a horizontal scale of 15Hz-200Hz.
To save your graphs, click the small floppy icon in the bottom left hand corner of your graph and it will save a 800bit wide jpg image.

That said, it is easiest to track down a problem of a dip like that (around your crossover) by taking a seperate measure of your sub and then a seperate measure of your mains and then use the All Measured tab to lay them on top of each other. It can show if one or both are at fault. Often the sub distance setting (in the receiver) can have a nice impact on dips that the phase control might not.

brucek


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