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When I calibrate the soundcard (soundblaster live 24bit external) does it matter if the
c-weighting box is checked or unchecked in REW?
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No..........
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The results I have gotten do not seem to be right in that the subwoofer frequency response rolls off dramatically below 40 hz
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Measure an RCA cable connected from line-out to line-in instead of the SPL meter connected to line-in and the subwoofer connected to line-out.
It should measure a flat response (with soundcard file loaded, and meter cal file cleared and C-weight box unchecked)................
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I have a Galaxy cm-140 meter and I have loaded the calibration curve. Should I use it
C-weighted or A-weighted and should I check or uncheck the REW C-weighted box?
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Set the Galaxy to C-Weight.
Leave the C-Weight box unchecked in REW. The cal file over-rides it at the cal files frequency extremes.
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I read in another thread to press the Apply Windows button to recalculate the frequency response with a calibration file.
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This is only required when you change cal files and want to recalculate the frequency response graph from the impulse response rather than take a new measure. The Apply button is in the IR Windows pop-up.
brucek