Old 10-25-2013, 09:34 AM   #1
Amether
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Default 11Hz 'Hum' on SE5600 II

We've had a SE5600 II for a while and it has been sounding just fine. Recently I've heard a very low (about 11Hz) hum/rumble that is there regardless of what preamp we're using and isn't there on other mics. It is reduced when putting the highpass switch on. Sometimes it gets worse for short periods. Any ideas?
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Old 10-25-2013, 10:55 AM   #2
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You can HEAR 11hz?
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Old 10-25-2013, 11:02 AM   #3
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11 Hz is impossible to hear. I doubt you have any speakers or headphones that can reproduce it either.
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Old 10-28-2013, 07:11 AM   #4
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Air Conditioning or some times refrigerators cause such rumbles.
Mic stands are prone to these, put some pads under them.
You need to use the HP filters at all times.
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Old 10-28-2013, 07:13 AM   #5
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Check the links. Boray Music and Burak Music. Haha!
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Old 11-29-2013, 09:11 PM   #6
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make a screenshot that shows that signal on the JS: Analaysis/gfxanalyzer in reaper

then we can see what you are talking about, and then we might find a solution
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Old 12-07-2013, 06:12 AM   #7
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Hi guys, thanks for the replies - ok maybe 'hear' wasn't the right word but you can see the wave quite clearly - and there's an even lower frequency wobble too. I'm pretty sure this isn't fridges etc as I don't get this on other microphones and it happens in both studios in separate parts of the building. Aircon is a luxury we can't afford.

I did link I thought to some files but here is a wav showing the 'hum'.

http://antennastudios.co.uk/share/SE5600a.wav



By the way, this is with the waveform made very big. It is not anywhere near the volume of speech but would affect the wave of speech visibly.
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Old 12-07-2013, 10:03 AM   #8
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World's first 'Dubstep Microphone' prototype? Haha.

Jokes aside,

Just had a go at the file. Indeed, there is a lot of low end rumble and peaks around 11Hz. My system does go down until 30Hz quite easily. The rumble sub is spread throughout the 30 - 50 Hz region and modulates a tiny bit.

Does the microphone have a PSU?
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Last edited by Splaaat; 12-07-2013 at 10:14 AM.
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Old 12-07-2013, 10:25 AM   #9
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it is quite loud on my speakers. but the way it sounds: it may be hot air. does the mic get hot and is it set up upside down. on the other hand i think it could be the backgroundnoize of the city. i had that in london. sounded very similar. was totally different in berlin and all the us studios.
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Old 12-08-2013, 02:56 PM   #10
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It does indeed have a PSU. I know someone with the same mic - I will ask if I could borrow theirs...

As for the London Rumble - I know what you mean but it isn't there on any other mic, wasn't always there and is identical no matter where I try this...

I like the hot air idea - it's set up with the diaphragm at the top. I think it's there straight off the bat but I will check, as well as turning it upside down so the hot air from the valve would maybe miss the diaphragm... Looks a bit regular though?
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Old 12-08-2013, 03:02 PM   #11
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Quote:
Originally Posted by Amether View Post
It does indeed have a PSU. I know someone with the same mic - I will ask if I could borrow theirs...

As for the London Rumble - I know what you mean but it isn't there on any other mic, wasn't always there and is identical no matter where I try this...

I like the hot air idea - it's set up with the diaphragm at the top. I think it's there straight off the bat but I will check, as well as turning it upside down so the hot air from the valve would maybe miss the diaphragm... Looks a bit regular though?
well i could swear it sounds like a bus. may be the other mics arent that sensitive.
the hot air thing: if the mic gets hot and is not mounted upside down, the hot air moving upwards creates a detecable sound. well... it shouldnt get hot. did anyone open it an check the membrane, may be a screw is loose.

Last edited by rmm; 12-12-2013 at 08:50 PM.
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