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Found 1 result

  1. Hello, I am learning location sound recording, practising as an enthusiast. I first try to use what I already have, and if necessary, I may invest a bit. These days, I focus on recording dialog. I would like to check whether buying an Audix SCX-1 / AT4053b / MK012 would improve the quality. I have a Beyer M88-TG, hypercardioïd, 2,9mV/Pa. I recorded my voice 40cm away from the mouth (acceptable for a close-up). The recorder is a USB soundcard, a Behringer UMC204HD. Although being an entry level device, pres are rather clean, EIN supposed to be -129dBu. I measured “signal to noise ratio” my own way (not really scientific): LUFS of spoken words / LUFS of silent parts. Of course, there is room tone in these silent parts. With the preamp gain at its maximum (56dB), I get 40dB difference between the average level of my voice and the noise. To my ears, this is acceptable. The level of my voice at the mic position is 59dBA. I tried to figure out what I could get from an small condenser microphone. I am not sure of my calculation. Let’s assume I have an SCX-1, 14dBA self noise. Ignoring the preamplifier noise, this means that the best signal to noise ratio I would get is 59-14 = 45dBA. Is that correct ? With a MK012, 18dBA self noise, this would give 59-18 = 41dBA S/N, Correct ? At best, the SCX-1 would provide an improvement of 5dB over my M88. It would indeed not be that much due to preamplifier noise, plus the fact that current “noise” contains an unknown amount of room tone. The MK012 would probably bring no improvement at all, or even worse than the M88. Now, I tried to estimate the M88 self noise. This is a dynamic microphone. Lets’ assume the noise is the one of a 150 ohm resistor, so -130dBu, as proposed by an article on Neumann’s website: https://www.neumann.com/homestudio/en/will-a-better-preamp-give-you-lower-noise -130dBu = 0,245µV M88 sensitivity is 2,9mV/Pa. Sound pressure equivalent to noise : 0,245E-6 / 2,9E-3 = 84,5µPa Equivalent SPL: 20*log(84,5E-6 / 2E-5 ) = 12,5dB 12,5dB is extremely low. I guess A-weighting would even lower it. Is that calculation correct ? Does this mean that, due to its high sensitivity (for a dynamic microphone), the Beyer M88 competes with the best small diaphragm condensers as long as I use a clean preamplifier ? Or... is my calculation complete BS ? By the way, I also made tests with an AT4033, 17dBA self noise, 25mV/Pa, and the results were really close to the M88: about 40dB difference between voice average level and noise. This again suggests there is not much improvement to be expected buying a decent condenser, at least with rthe ambient noise (measured at 34dBA) Please note I just focused on noise here. I know the M88 is highly sensitive to vibrations, wind, and weight a lot if boomed. Good reasons to use something else. Thank you for reading.
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