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Old 10-28-07, 03:12 PM   #7 (Link)
 
brucek
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Re: My graph please help...


I think the graph #2 looks pretty good (purple dotted).

As mentioned before, best to use a vertical scale of 45dB to 105dB for your next graphs.

After you've taken a measurement and you want to be more aggressive with the filtering, you can raise the level of the measured line to include a bit more above the target line. Use the Trace offset thumbwheel in the left panel pulldown called Trace Adjustment. You can click the Add offset to data button to permanently add the data from the thumbwheel and zero the offset after that's done. Once that's done, the filters will be more aggressive since REW sees more of the signal above the target. (Alternately, you can achieve the same thing by lowering the target after a measure, but I prefer the data offset).

This can be iterative. Raise or lower the data measure line as described above, and then create the filters and Optimize them. Then, if you don't like the result, clear the filters and peaks and repeat after you've adjusted the measure line again until you're satisfied.....

Tip: click the up/down arrow symbol in the EQ filters panel to sort your filters from low to high. Makes it easier.

Quote:
you were saying using the filters above 100Hz is a waste, so should i just turned those filters off in EQ filter?
Usually, there's not a lot of overall effect of filters above 100Hz after the mains are added in, so you simply don't load them into the BFD. You can turn them to None in the EQ filters panel or if you're entering them by hand, simply don't load the ones above 100Hz. reserve any filters at this frequency and above until you've added the mains, and then they may be useful for tweaking around the crossover..

brucek


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