Hi Ken,
Quote:
brucek wrote:
You should
[1] Set sweep to -12db
[2] Set Wave to 1.000 and Output to 0.500
[3] Adjust receiver volume to 75dB on RS meter.
[4] Set Input level to proper level ~-12dBRMS.
[5] Run CALIBRATE SPL routine and set REW level to 75dB
[6] You could run Set Target Level routine at this point and it should verify around 75dB....
[7] Measure
brucek
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I followed your steps without any improvement. I went back through your posts about the Spectrum function of REW and decided to try it with no nosie in the room. I'll save space and your time by not posting a bunch of graphs but I noticed a steep rise in the FR from 100hz on down to 10-11 hz with the analyzer just listining. I decided to try a different soundcard, went back to the Spectrum analyzer and sure enough - no rise in the FR I saw in the previous soundcard. Re-set it all back up and problem solved. Note all of this was performed with the soundcard left channel as reference in the Settings window.
Thanks for taking time to walk me through this.
BTW: soundcard I think is bad was a Soundblaster 24bit USB external. The soundcard I replaced with was the internal SigmaTel Audio that came with my Dell Vostro and much to my suprise it measured almost flat from 12hz --> 9.5khz.
Mike.