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Discussion Starter #1
Hello,

I am attempting to do some basic sub measurements(20-150hz),
somehow I am getting a null drop in the graph around 37.

yet if I use the generator and do a manual sweep and display spl at the same time there is no such dropoff.
I am using the radio shack digital meter and crystal soundcard both calibrated and loopback showing as expected.

Any suggestions ?

thx,

L
 

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Discussion Starter #3
no, but if I manually sweep through a range of frequencies using the sinewave generator and the spl meter I don't get the drop.
 
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