StudioTrax Forums  

Go Back   StudioTrax Forums > General Recording & Recording Techniques > Recording Vocals
StudioTrax Home Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Recording Vocals Recording Vocals techniques.

Reply
 
Thread Tools Display Modes
  #1  
Old January 16th, 2009, 09:59 AM
MMB's Avatar
MMB MMB is online now
Grand Master Contributor
Valued Patron
 
Join Date: Jul 2006
Location: Hanover, PA USA
Posts: 7,484
Default 60 Cycle Hum in Mic?

OK - I've heard about it, but didn't think I had ever experienced it recording until I did some spoken word stuff last night solo (no music or anything behind it) .... 60 cycle (I think) hum ... not horrible, but very noticeable in that kind of recording.

My new (timely) Izotope RX de-hummer, on the "60 cycle with harmonics pre-set" did a fine job of removing most all of it cleanly, but I'd rather "nip it in the bud."

What kind of things would be causing this? Is this a ground loop problem? Everything in my mic signal chain is balanced with good cables. What sort of things should I look for and try to fix this?

The chain is Rode K2 mic to it's dedicated power supply to Vintech x73i pre to dbx160a compressor to balanced Hosa patchbay to Fireface 800 and into computer (SONAR)

Any ideas appreciated!
__________________
KenM

Sound Works R&P Studio - MMB Music Page
Play the sunset .....
Reply With Quote
  #2  
Old January 16th, 2009, 10:17 AM
Watershed's Avatar
Watershed Watershed is offline
Senior Master Contributor
Valued Patron
 
Join Date: May 2007
Location: Southern Victoria, Australia
Posts: 2,166
Default Re: 60 Cycle Hum in Mic?

Not good, Ken.

I'd start by unplugging everything else in your studio one by one, whether it's turned on or not. See if you can isolate it that way.
Do you know an electrician well enough the he would do a quick earth check on your property? It's amazing how many houses were never earthed properly.
Reply With Quote
  #3  
Old February 10th, 2009, 07:56 PM
2db's Avatar
2db 2db is offline
Master Contributor
 
Join Date: Oct 2005
Location: Lancaster, Pa.
Posts: 1,077
Default Re: 60 Cycle Hum in Mic?

The likely source of the problem is a hum field in your studio caused by the AC power lines.

Any type of dynamic mic, like the Shure SM57 or SM58, contains a voice coil that is very susceptible to picking up the hum field. Nothing can be added to these mics to control this.

Some dynamic mics like the Shure SM7B contain an internal hum bucking coil that reduces hum pick-up. Reduces, not eliminates. Other dynamic mics, like the Shure Beta 58A have more effective shielding around the voice coil that also reduces hum.

ALL dynamic mics will pick up this hum field to some extent.

Condenser mics, like the Neumann's you have or the Shure KSM mics, do not have voice coils. These mics will perform much better in a hum field. But many of these mics have output transformers that, like a voice coil, will also pick up the hum.

If the hum field cannot be eliminated, stick with high quality condenser mics with transformerless outputs. Shure KSM mics are condenser mics with transformerless outputs.
__________________
James Easton

It is cruel, you know, that music should be so beautiful. It has the beauty of loneliness and of pain: of strength and freedom. The beauty of disappointment and never-satisfied love. The cruel beauty of nature, and everlasting beauty of monotony.


ABBEYVILLE ROAD
Join me on youtube
http://www.youtube.com/user/AbbeyvilleRoad?feature=mhum

Last edited by 2db : February 10th, 2009 at 08:00 PM.
Reply With Quote
  #4  
Old February 10th, 2009, 07:59 PM
2db's Avatar
2db 2db is offline
Master Contributor
 
Join Date: Oct 2005
Location: Lancaster, Pa.
Posts: 1,077
Default Re: 60 Cycle Hum in Mic?

I had a separate ground rod put in and connected to the fuse box and run dedicated circuits off of it. I also picked up a UPS which further isolates the room from rf and other dirty power. No more hum...
__________________
James Easton

It is cruel, you know, that music should be so beautiful. It has the beauty of loneliness and of pain: of strength and freedom. The beauty of disappointment and never-satisfied love. The cruel beauty of nature, and everlasting beauty of monotony.


ABBEYVILLE ROAD
Join me on youtube
http://www.youtube.com/user/AbbeyvilleRoad?feature=mhum
Reply With Quote
  #5  
Old February 10th, 2009, 08:29 PM
Tubeman's Avatar
Tubeman Tubeman is offline
Senior Master Contributor
 
Join Date: Feb 2008
Location: USA
Posts: 3,314
Default Re: 60 Cycle Hum in Mic?

Are you using a power conditioner in a rack mount??... the better ones have RFI filters... any dimmer switches on nearby the studio... fluorescent lights, wall warts, new units in the rack with transformers in them?
Are you using a mic that has a tube in it??
__________________
Producer / Engineer - Anvil Records
Reply With Quote
  #6  
Old February 10th, 2009, 08:44 PM
2db's Avatar
2db 2db is offline
Master Contributor
 
Join Date: Oct 2005
Location: Lancaster, Pa.
Posts: 1,077
Default Re: 60 Cycle Hum in Mic?

Quote:
Originally Posted by Tubeman View Post
Are you using a power conditioner just a Monster pro 3500in a rack mount??... the better ones have RFI filters... any dimmer switches on nearby the studioyes but the studio is now isolated from the house current... fluorescent lights,no wall warts, new units in the rack with transformers in them?yes but plugged into the 3500 into the UPS and into the dedicated circuitsAre you using a mic that has a tube in it??several
no hum since the updates
__________________
James Easton

It is cruel, you know, that music should be so beautiful. It has the beauty of loneliness and of pain: of strength and freedom. The beauty of disappointment and never-satisfied love. The cruel beauty of nature, and everlasting beauty of monotony.


ABBEYVILLE ROAD
Join me on youtube
http://www.youtube.com/user/AbbeyvilleRoad?feature=mhum
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 08:35 PM.


Powered by vBulletin® Version 3.6.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright © StudioTrax.Net 2001-2017