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have read in numerous posts that the Microphone jack is not suitable for testing when connecting the SPL out to the sound card.
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Correct, the mic input is not suitable unless it's the type that can be toggled with software between line-in and mic. Generally, you require a simple line-in since the RS meter outputs a line level out. Note that an SPL meters output is dependant on the scale used.
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if the Sound Card could be the problem
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No, that soundcard is fine. Be sure you're using stereo plugs, since the jacks are stereo. Be sure to turn off all effects and soundfields, and use two speaker stereo mode for the soundcard only.
If you're able to complete the soundcard calibration routine, you're good.
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Also should I be hearing audio from the L/R channels when testing the subwoofer?
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The analog line-out of the soundcard should connect to the AUX or CD in of your receiver. You can use a Y-splitter if you want at that point to enable both left and right mains.
brucek