Question about AKG C418 Professional Microphone

2 Answers

AKG C418 is not working!

How do I determine whether or not the 418's diaphragm is working? I've already determined continuity in the internal wiring.

Posted by tshogy on

  • 2 more comments 
  • tshogy May 07, 2008

    Hello Shaggyrat,
    Thanks for your response. I'm not sure you understand what I'm asking. I'm not speaking of a software or driver problem. The problem I'm having is with the microphone. Though I'm using 48v it is totally dead. I took the mic apart and checked continuity with a meter. Please let me know if you know how to actually test the capsule.

  • tshogy May 07, 2008

    Hello Shagyrat,
    Thanks for the engineering tips but I have engineered for over 30 years. My question is pertaining to testing the capsule in order to find out if it's fried or if there is just some internal loose connection.

  • tshogy May 07, 2008

    Hello Shaggyrat,
    Sorry but testing a condenser through a guitar amp is totally besides the point. I need to talk to a tech about how to test the capsule of the mic. 

  • tshogy May 22, 2008

    That makes total sense! I do have another c418 so,  I can try that.



2 Answers


Most people do no use just one C418. If you have another C418 or other model from the MicroMic series, borrow the PCB located inside the XLR housing. Replace the board on the defective C418. If the mic now works, the original PCB is defective. If it doesn't, it is safe to assume that the capsule is fried.

Replacement parts are available from AKG at 818 920-3279. When soldering a capsule, use the hottest solder iron possible. Iron contact with the solder terminals longer than two seconds can burh up the capsule. The faster you can flow the solder and remove the iron, the less likely you will damage the new capsule. Be sure to use a heat sink to dissipate the heat as fast as possible.

Posted on May 22, 2008


Christophe Thompson

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It works its probably just that you dont have your drivers set up right same problem here with my usb mic you gotta go into sound and change the standard mic to the mic you want to use and if you have a web cam mic also hooked up you will want to disable web cam mic (not the web cam) in drivers these 2 mics are having conflict of interest

Posted on May 07, 2008

  • Christophe Thompson
    Christophe Thompson May 07, 2008

    this mic is a condensed mic which requires 9-52VDC phantom power

    The mic can handle SPL’s of up to 140dB with 3% THD or 131 dB with 1% THD. The signal to noise ratio is 56 dB (A-weighted)

    There are two versions of this mic: C-418PP and C-418L. The PP version has the standard XLR connector and requires a mixer or source that has phantom power. This is the most common version. The ‘L’ version has a ‘Mini’ XLR connector that is used with the AKG B29L battery operated power supply, MPA-V-L external phantom power adapter, or the WMS body pack transmitter.

    The C-418 has a hyper-cardioid polar pattern which means it has a narrow pickup field and rejects sounds from behind and to the sides. This is one of the main reasons the mic is great for drums. One thing you may want to test for and that is placing the mic so it picks up the sound of the cymbals bouncing off of the top of the drum head. You can angle the drum just enough to redirect the reflected cymbal sound away from the mic element. If you want a tight and punchier sound then aim the mic towards the perimeter of the drum head. For a more rounder and natural sound then aim the microphone towards the center of the drum.

    Some microphones have switches where you can reduce the decible input, or "pad" the input. Well the c418 does not, so you need a mic preamp that has a button to do the reduction

  • Christophe Thompson
    Christophe Thompson May 07, 2008

    do you have a regular guitar amp try the old fashioned hook it up turn it up for the mic sorry just caught on to what your saying but it states that to test a mic you gotta put under an amp my grammer not the best but i try my brain fried from too much thinking lol i have a behringer amp that has built in mic testers on them in the back for even the worst of mics to make sound good



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