Quote:
brucek wrote:
 Well, you still need to use your SPL meter to set the 75dBSPL level in the room with your receiver (while holding it near the ECM8000)... and then you put that SPL meter away, and then set the input level into REW from the ECM8000......
bruek |
Correct me if I'm wrong but...
I don't think it has to be 75db though (it does on loopback back test though).
You're just calibrating REW/SoundCard/Mic against a real SPL meter. As long as you match something in the vicinity of 75 it shouldn't matter. I used 84 because I used RPlusD to find the peak S/N of output and Mic sensitivity.
As long as REW knows what 84db SPL is, it should be ok. It's basically a single point calibration and you should be able to use any point (within reason).
The directions say on the Calibration dialog just put in what your SPL meter reads. If it had to be 75 then it would say adjust your audio system/soundcard to output 75db and not allow you to type in a value. You can leave it 75 and adjust Stereo/SoundCard output if you want to. Both ways should be valid.
If I calibrate at 75 I'll just end up fiddling with StereoOutput/Soundard settings to get measurements in a good full scale range, so I just leave that and get REW to understand what SPL level I'm at.