A technical support community for Apple Logic Pro users.

 
User avatar
makeyourself236
Topic Author
Posts: 84
Joined: Wed Feb 04, 2015 8:37 am

Mic Noise

Tue Jun 30, 2020 10:43 am

I have an AT4047SV and have always noticed that it seemed like a had a higher noise floor than I would like. However, it has started making all kinds of crazy sounds recently and I'm not sure what the problem is. I have uploaded a clip on sound cloud so that you can hear what I'm talking about. If anyone has any thoughts on what could be causing it I would appreciate the help.

Second to this, I'm having a strange grounding issue with an SM57. If I don't touch the chassis of the mic I don't hear any buzzing or if I touch the mic and ground myself with a piece of equipment in line the buzzing goes away. I switched out several cables through my entire system (XLRs, balanced vs unbalanced) and nothing seemed to help.

Mic (At4047SV / SM57) > ART Voice Channel > balanced TRS cable > Focusrite Scarlett 18i8 2nd gen > Mac Mini

Here is the clip of the AT4047 making the noise: https://soundcloud.com/jared-holton/mic-noise

Thank you for thoughts and ideas in advance!
Logic Pro X 10.4.4. Mac mini (2018). Mac OS Mojave (10.14.2). 3.2 GHz Intel Core i7. 16 GB RAM. Intel UHD Graphics 630 1536.
 
User avatar
makeyourself236
Topic Author
Posts: 84
Joined: Wed Feb 04, 2015 8:37 am

Re: Mic Noise

Tue Jun 30, 2020 10:58 am

Also, if this helps give more information regarding the SM57. I plug my guitar DI into the Hi-Z input of the Art Voice Channel to record and do not have a ground hum with the same path replacing the microphone with the guitar. It seems inherent only to that mic. While the AT4047 does have all the other strange noises, I can't hear a ground loop hum with that mic in the same signal path either.
Logic Pro X 10.4.4. Mac mini (2018). Mac OS Mojave (10.14.2). 3.2 GHz Intel Core i7. 16 GB RAM. Intel UHD Graphics 630 1536.
 
User avatar
triplets
Posts: 16860
Joined: Wed Sep 14, 2005 3:21 pm
Location: North Hollywood
Contact:

Re: Mic Noise

Wed Jul 01, 2020 1:02 am

The thing I would try right away is to plug the 4047 into the Scarlett mic pre and see if it's clean.
Logic Pro 9 Master Pro and X certified
ProTools 10 & 11 Certified Operator
2 x 3.06 Intel Six-Core 24 GB RAM, Logic 10.4.8, 10.14.6., UA Apollo
2012 i7 MBP Logic 10.4.8, 10.14.6
Contact me for Logic help (Teamviewer, Zoom, Skype)
http://www.ultimatestudiosinc.com
 
User avatar
makeyourself236
Topic Author
Posts: 84
Joined: Wed Feb 04, 2015 8:37 am

Re: Mic Noise

Wed Jul 01, 2020 4:22 am

It still makes the same noise plugged directly into the Scarlett. I’be always turned phantom power on after it is plugged in. I’ve tried different xlr cables that don’t have issues with other sources.

If you have listened to the noise that I posted, there is no room noise that is making that strange noise. To some degree I’ve solved part of my problem with the SM57 by simply not touching the mic and using a stand. Still troublesome why it’s having a ground issue, but when I gain up that mic, there is just normal room ambience and none of the “phantom wind” noises or chirps are heard.
Logic Pro X 10.4.4. Mac mini (2018). Mac OS Mojave (10.14.2). 3.2 GHz Intel Core i7. 16 GB RAM. Intel UHD Graphics 630 1536.
 
User avatar
triplets
Posts: 16860
Joined: Wed Sep 14, 2005 3:21 pm
Location: North Hollywood
Contact:

Re: Mic Noise

Wed Jul 01, 2020 10:08 am

makeyourself236 wrote:
It still makes the same noise plugged directly into the Scarlett


Could be an issue with phantom power then, especially if you're not hearing it with the 57.
If you have the same noise with another interface, then the 4047 might be faulty?
Logic Pro 9 Master Pro and X certified
ProTools 10 & 11 Certified Operator
2 x 3.06 Intel Six-Core 24 GB RAM, Logic 10.4.8, 10.14.6., UA Apollo
2012 i7 MBP Logic 10.4.8, 10.14.6
Contact me for Logic help (Teamviewer, Zoom, Skype)
http://www.ultimatestudiosinc.com