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I am taking measurements with REW but have a small problem.

As soon as I plug in an RCA to 3.5mm jack cable into the output connecter the guage reads maximum. My PC still manages to get proper readings so I am curious as to why this is happening.

Thanks in advance.
 

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The PC input is carrying supply for a condenser mic. Try the other channel, sometimes the supply is only on one channel.
 

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Same thing happens to my radioshack SPL meter, tried both left and right but still reads max..
 

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I'm planning on calibrating for the first time today. So I'm still reading up on everything but my RS SPL has a switch for SPL range... 80-70, 70-60, 60-50. I've noticed it the switch is set lower then the output volume the signal meter reads MAX. Could this be the issue?
 
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