#1
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Weird Science.
I'm getting a strange crackling noise on specific frequencies when I record with my Gefell M300 mikes. The noise is similar to a clipping spike. It has taken me a while to figure this out but today I got the issue narrowed down to 185 Hz (F#,4th string) and even more noticeably 190Hz (G, 3rd open, or at V of the 4th string). There is less crackling but still some at the octaves both above and below these frequencies. The issue is present on different guitars, at different buffer sizes and occurs regardless of mic placement etc.. This afternoon I switched out the Gefells for a pair of AKG 451s (the old ones) and the crackling was gone. Then I set up my Sennheiser MKH 800 P48. No crackling with this mic either. For sonic clarity, presence, range etc. the Gefells are my first choice for recording acoustic guitar but the noise issue is definitely putting a damper into the recording experience. Is this an issue any one else has had to contend with and if so, what did you do to remedy the situation.
Thanks (again), Trevor |
#2
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Some times it is from moisture on the mike diaphragm. Try drying the mike (A little warmth from a lightbulb - 30 minutes or so perhaps).
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Derek Coombs Youtube -> Website -> Music -> Tabs Guitars by Mark Blanchard, Albert&Mueller, Paul Woolson, Collings, Composite Acoustics, and Derek Coombs "Reality is that which when you stop believing in it, doesn't go away." Woods hands pick by eye and ear
Made to one with pride and love To be that we hold so dear A voice from heavens above |
#3
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Was this the same strange noise I removed from your recording last week? Derek's light bulb drying method is a good suggestion. Just place the mics in their mounts on the stands and keep them about 18" above a 60 watt bulb for some time (I've done it overnight). I don't know what you humidity is like in your studio, but if too high, or if it changes often, that can do some weird science on mic diaphragms. |
#4
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BTW - Despite the noise issue the Gefells really do sound much fuller and sparklier than the AKGs, although they sound pretty good too. |
#5
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Your observation that the noise/burp only happens at certain frequencies, with any guitar, and only with the M300 mics, leads me to think it might be a mechanical resonance quirk and not something electronic at all (i.e., neither analog or digital). On the other hand, having two mics with the same mechanical resonance issue would be very very very unlikely. Weird science indeed. |
#6
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Thanks for the input, Steve. I'm "drying" the Gefells this morning and in the meantime will call a a local mic technician who has done some repair work for me in the past. Your comment about mechanical resonance is leading me to wonder if there's some bizarre confluence of room reflections that the acoustic baffles aren't dispersing and the mikes are amplifying. Later today I'm going to rearrange my recording setup and see if that helps if drying the mikes doesn't.
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#7
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Rearranging my recording setup made no difference. Spoke to a microphone technician in my area and his advise is to try using an external phantom power supply for the Gefells. I had one but have misplaced it so it will be a few days until i know if this will be a fix.
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Tags |
acoustic guitar, clipping noise., gefells |
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