Her er en txt fil som tilhører mikrofonen min. Den har kalibreringstall ned til 775 hz. Under der må jeg selv legge til det som trengs for at mikrofonen skal bli kalibrert helt ned
Legger med en veiledning fra Tod Davis:
Dear Tor Arne, You provided no letter with the serial number so given the purchase date it would have been C or D. I tried D. Please look into the XLR cavity and report back if it isn't D. Please read the explanation about using the low frequency data below.
EDITING THE ECF CURVE TO 10Hz & BELOW:
Using the magnitude value found at the lowest frequency value (approximately 790Hz) in your ECF, you can edit the ECF, by adding coordinate points (as needed) to the .TXT file for the frequency values you require, between ~790Hz & 10Hz. For example, if you copy and paste the 790Hz line of the .TXT file into the line preceding it and then change the frequency value to 10Hz, you will have a curve with < +/-0.25dB of error between 10Hz & 790Hz. To get accurate measurement to the -3dB roll-off point of the specific model (5Hz [M30], 4Hz [QTC40], 3Hz [M50] & 9Hz [M30BX]), enter the 790Hz value, less 3dB, at the specified low end frequency, for a near vanishing error.
Best regards, Tod
--
Tod Davis
Earthworks Engineering
Er ikke helt sikker på hva han mener, men det er sikkert noen andre her som forstår dette bedre en meg.
"Transfer Function Mag - dB volts/volts (0.10 oct)(eq)(eq:aux)"
"Hz" "Data"
775.5054, -1.156117
832.9503, -1.150029
890.3951, -1.150084
947.84, -1.155277
1034.007, -1.168816
1091.452, -1.179967
1177.619, -1.202282
1263.787, -1.235145
1349.954, -1.26191
1436.121, -1.29649
1551.011, -1.344064
1665.901, -1.389264
1780.79, -1.427297
1895.68, -1.453713
2039.292, -1.465763
2182.904, -1.456483
2355.239, -1.429433
2527.573, -1.402988
2699.908, -1.391242
2900.965, -1.39986
3102.022, -1.416215
3331.801, -1.428611
3561.581, -1.428867
3820.082, -1.435305
4107.307, -1.462877
4394.531, -1.489753
4710.478, -1.490633
5026.424, -1.479005
5399.816, -1.479604
5801.93, -1.478625
6204.044, -1.490122
6663.602, -1.538041
7123.161, -1.533972
7640.165, -1.518496
8185.891, -1.536092
8760.339, -1.47872
9392.233, -1.493303
10081.57, -1.468425
10799.63, -1.421898
11575.14, -1.372547
12408.09, -1.307387
13298.48, -1.258016
14246.32, -1.24792
15280.33, -1.191915
16371.78, -1.203875
17549.4, -1.199561
18813.19, -1.20884
20163.14, -1.196406
21599.26, -1.205132
23150.27, -1.289519
24816.17, -1.492871
26596.96, -1.886289
28492.64, -2.409174
30560.66, -3.073438
32743.56, -3.778234