Hey folks!
My mic is working now Thanks again for the people that helped me out!
I’m back with some questions about measuring a microphone. Sadly, Gefell (wo promised me to measure my mic and do a kind of shootout against an original U47) told me today that this measuring test won’t take place. They don’t have time for that. So now I’m on my own. Horrifyingly I got to finish my bachelor thesis till the 30.9. and I don’t have a clue how to measure these parameters without the cool equipment Gefell got in their HQ. :-\ So I got some ideas and I would love to get some input from you guys. Keep in mind that I don’t want to promote anything with these results. I just want to check how close my DIY mic is to the original.:
Frequency response
My first idea was to use a measuring microphoneand use it as some kind of reference, put the U47’s (original and mine) in a quiet room and use a loudspeaker and a signal generator. Increasing the frequency from low too high and writing down the values shown on a FFT-Plugin.
The curve might look like crap, because of the room and the frequency curve of the loudspeaker, but at least it’s possible to see how big the difference between these mic’s is.
Sensitivity
Same kind of setup but using a signal generator and the loudspeaker to generate a 1kHz sine wave with 94 dBa.(Using the measuring microphone to check the 94 dBa)
When 94 dBa is reached I will be measuring the Voltage at the XLR Pins of the U47’s power supply, that would get connected to the Mic preamp? Does this make any sense? It’s not allowed to open the original U47/power supply. So there is no way in getting in there somewhere.
Self-Noise
Rest of these things will be really hard to measure I guess. For self-noise I would have to build some kind of Rauschbombe right? But again… I can’t open up the original u47… so this won’t make sense anyway?
Klirr factor
Same setup like when I’m measuring the Frequency response. Using a FFT-Plugin to analyse. But not sure if this makes any sense at all. The room is a “kind of dead” recording room and I guess the loudspeaker will start to klirr on its own.
Intermodulation-factor & Differenzton-factor
Same problem as Klirr-factor.
What do you think… will these tests make any sense at all?
Do you guys have any idea how to do it? Without buying stuff worth 1000€.
Cheers
Zottel
My mic is working now Thanks again for the people that helped me out!
I’m back with some questions about measuring a microphone. Sadly, Gefell (wo promised me to measure my mic and do a kind of shootout against an original U47) told me today that this measuring test won’t take place. They don’t have time for that. So now I’m on my own. Horrifyingly I got to finish my bachelor thesis till the 30.9. and I don’t have a clue how to measure these parameters without the cool equipment Gefell got in their HQ. :-\ So I got some ideas and I would love to get some input from you guys. Keep in mind that I don’t want to promote anything with these results. I just want to check how close my DIY mic is to the original.:
Frequency response
My first idea was to use a measuring microphoneand use it as some kind of reference, put the U47’s (original and mine) in a quiet room and use a loudspeaker and a signal generator. Increasing the frequency from low too high and writing down the values shown on a FFT-Plugin.
The curve might look like crap, because of the room and the frequency curve of the loudspeaker, but at least it’s possible to see how big the difference between these mic’s is.
Sensitivity
Same kind of setup but using a signal generator and the loudspeaker to generate a 1kHz sine wave with 94 dBa.(Using the measuring microphone to check the 94 dBa)
When 94 dBa is reached I will be measuring the Voltage at the XLR Pins of the U47’s power supply, that would get connected to the Mic preamp? Does this make any sense? It’s not allowed to open the original U47/power supply. So there is no way in getting in there somewhere.
Self-Noise
Rest of these things will be really hard to measure I guess. For self-noise I would have to build some kind of Rauschbombe right? But again… I can’t open up the original u47… so this won’t make sense anyway?
Klirr factor
Same setup like when I’m measuring the Frequency response. Using a FFT-Plugin to analyse. But not sure if this makes any sense at all. The room is a “kind of dead” recording room and I guess the loudspeaker will start to klirr on its own.
Intermodulation-factor & Differenzton-factor
Same problem as Klirr-factor.
What do you think… will these tests make any sense at all?
Do you guys have any idea how to do it? Without buying stuff worth 1000€.
Cheers
Zottel