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SM58 low output


Jordan

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Has anyone come across this problem with an SM58 or any ideas?

 

On friday night I was doing sound for a local band that I have worked with a few times before. During soundcheck I couldnt get much from the lead singers own fairly new sm58. Tried various things like swapping cables, different channels etc to no avail so I gave him a different mic problem solved.

 

I took his mic home to see if I could fix the problem. Opened it up and all wires apear to be attached ok. I dont want to start resoldering yet as it is still under warranty.

 

So I did a little test against a couple of known good sm58. I set them up in turn in the same position in front of a speaker and played some pink noise and recorded what the mic was picking up.

 

Both of the known good ones gave almost identical results with the faulty one being 3db down and showing a fairly noticable drop in frequency responce above 250hz. I tried to get a reading across pins 2 and 3 as I thought that might tell me something but my meter was playing up. I think I was getting 150 ohm across the two good mics and about 17 on the faulty one.

 

I need someone more knowlegable than me (probably everyone on this forum) to interpret these results.

 

Cheers

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OK it's a microphone and it says SM58 but is it???? There are forged mics of all brands -but usually the big names! They are microphones just not what they say. Shure did once have a web page listing some features that separated a genuine SM58 from the imitations. If it was a new mic then it could be that someone bought a cheap one from a second line dealer or a web supplier, Had you actually met that particular mic before???
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OK it's a microphone and it says SM58 but is it???? There are forged mics of all brands -but usually the big names! They are microphones just not what they say. Shure did once have a web page listing some features that separated a genuine SM58 from the imitations. If it was a new mic then it could be that someone bought a cheap one from a second line dealer or a web supplier, Had you actually met that particular mic before???

 

 

Good point but I have actually worked with this mic before and it has been ok on previous occasions. cheers

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  • 2 weeks later...
Has anyone come across this problem with an SM58 or any ideas?

Our singer has a SM58 I've noticed it has no where near the same output as our other two mics which are Sennheiser. I think it's an original? He's going to get a Sennheiser.

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Our singer has a SM58 I've noticed it has no where near the same output as our other two mics which are Sennheiser. I think it's an original? He's going to get a Sennheiser.

 

Different microphone models have different sensitivities and therefore different output levels for similar input signals.

That's one reason mixing consoles have pads and input trims.

 

So if you need a matched set of mics, by all means get another Sennheiser.

 

Otherwise, you really need to learn the basics of audio.

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