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Low Freq Pulsing on Audio Technica AT4040 Microphone

I have an AT4040 microphone <1 yr old. Recently, I've found a problem with low freq pulsing sound at around 1-3 hz or so. I've tried swapping out with a different mic in the signal chain and found that other mics do not have that problem. What is this likely to be caused by?

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SOURCE: Audio technica microphone atm33a socket detached

Unfortunately you will have to contact them here: as they don't seem to have that document listed on their site.

Posted on Jan 18, 2010

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My At 4040 just stopped working, no sound ?

Use a volt meter to measure the phantom power. Measure DC voltage between pins 2 and 1 and then between 3 and 1. They should measure the same and be between 12-48 volts dc.

Dec 30, 2012 | Audio Technica Audio-Technica AT4040...

1 Answer

I plug my mic into my mac and try and use Garage Band. The playback has a bunch of static noise no matter how high the volume of my mic is. How do I fix this problem? My email is

The standard ports on a mac are not the best for audio production. their impedance are quite low an I have found lots of recordings to come out clipped or like you say, full of noise.

Best think to do is to get a cheap USB 2 or firewire external soundcard. One of the best moves to bring a mac to audio life.
M-audio make a good range from ok price to quite pricey :-)

Jan 07, 2011 | Audio Technica Audio-Technica AT2020 -...

1 Answer

I have a low level hum in the MIC like a motorcyle in mt AT 4040

Remember this is a condenser mic that REQUIRES phantom power. There are several failures regarding this phantom power delivery that COULD cause your problem.

A "LEAKY" mic cable that is not a fully balanced cable can cause the problem. Test with another cable to exhonorate your cable.

A failure of the input bypass caps in your amp/preamp can cause the input to become unbalanced and let in hum.

A phantom power that is improperly filtered can also cause this. Test using a different source of phantom power.

Remember that you can easily get feedback that may oscillate like hum if you have a monitor speaker anywhere in "earshot" of the mic. They are very sensitive and intended for studio use.

Sep 26, 2009 | Audio Technica Audio-Technica AT4040...

1 Answer

Audio-Technica AT2020 low audio output

Pins 2&3 are the correct ones to use for checking the voice coil. Pin 1 is chassis ground and should always read infinite resistance to the other two.

That microphone has an impedance of 100 ohms, so if you are reading 30 ohms you clearly have a problem with the voice coil.

Good Luck

May 16, 2009 | Audio Technica Audio-Technica AT2020...

1 Answer

Two diffrent units with two diffrent frequincys . i wantto change

I hate to be the bearer of bad news but those units are fixed frequencies and cannot be changed. You either have to find a mic that matches your receiver or vice-versa. The freeway 200 series comes in 3 freqs. two of witch you have with the addition of 170.245. Maybe you can find someone who has a damaged mic but still has the receiver with the freq. that you need for your mic.

Apr 11, 2009 | Audio Technica Audio-Technica ATW-T202...

5 Answers

Hannah montana mmicrophone

I found this on Yahoo:

I Have The Directions Here
1. for best proformance please note the following
a. place the FM radio in an area of minimal nosie and interference
b. do not set vol to max
c. has to be within 15 ft
d. hear your own voice, will not be brodcasted over the radio
e. in some areas, all frequencies in 92 to 106 FM range could be occupied by a local radio station. in this rare case, your mic will not be functional
3. move mic close to radio while tuning, tuning into frequnecy may take practice. may need to move your radio dial slowly and sing or talk in to the mic

Buttons on the mic:
A.... Applause
S.... DJ Scracth Efeect
M.... Mic
Source(s): Hanna Montana FM wirless mic instruction manual

Feb 10, 2008 | Microphones

1 Answer

Microphone distorted

is this a power mic? check with a back up mic if it does it with the backup its not them its past them.

Jan 01, 2008 | Audio Technica Audio-Technica AT4040...

1 Answer

Audio technica at 4040 constant ground hum noise

you can test the cable from connection to connection for continuity from end to end. There should be no resistance( a complete short) If the cable is good, there is a bad or broken connection inside the mic. Good Luck

Jun 23, 2007 | Audio Technica Audio-Technica AT4040...

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