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when I run the sweep it tells me that I am to low. What is that all about?
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That's because the
Check Levels routine in the Measurement screen and the
Check Levels routine in the Settings screen use different values to generate the pink noise.
The Check Levels routine in the the settings screen uses the fact that you have the 'Check/Set levels with Subwoofer' pull-down selected. To double check and verify that the end sweep frequency that you have selected in the Measurement panel matches that subwoofer setting, its' Check Level routine uses the end frequency as the pink noise hi-limit cutoff. So if you had 20KHz as the end frequency to measure for your sweep, you can see how the pink noise would be different (between the two Check Levels) and as such the low level signal you're experiencing.
Set the End Frequency in the Measurement panel to 200Hz..................
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I was thinking about not running to the receiver, just direct in to the sub. Is this possible?
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Then you don't have as easy a control over the 75dB target level, and you lose the crossover for your sub.
brucek