As planed, i've created a measure with the two mics:
I've placed the speaker in the ground and placed each Mic flat on the ground (which explains the drop in SPL after 3Khz), to guarantee each Mic would be placed in the exact same place. The mic was about 20cm from the speaker.
I used REW functions:
The results shows that the Behringer is much more accurate than what i was expecting:
Here the 5Khz to 20Khz in detail:
- CSL Calibrated Umik-1 with 0º file,
- Stock Behringer ECM8000 + Behringer UMC404HD.
I've placed the speaker in the ground and placed each Mic flat on the ground (which explains the drop in SPL after 3Khz), to guarantee each Mic would be placed in the exact same place. The mic was about 20cm from the speaker.
- Umik-1 measurements were taken using the Acoustic Timing reference,
- Behringer measurements were taken with loopback connection as Timing reference.
I used REW functions:
- Time Align
- Align SPL at 75db
The results shows that the Behringer is much more accurate than what i was expecting:
Here the 5Khz to 20Khz in detail:
i would not be surprised if they both came from the same factory. There aren't that many shops in Asia making that type of microphone. And even fewer making ECM capsules so they will be quite close. Even slight differences in placement (or mike grid styling) can make the difference you show. Typically picking up and placing back a mike can show that level of difference.
What surprised me the most was the Behringer (stock, without any calibration file) being almost as accurate as a calibrated CSL Umik-1.
Can you share the calibration file for the Umik-1? It will show where the uncorrected mike departs from ideal. Then compare to the difference between the two mikes.