Ground Lift introduces buzz

rx3000 · 19th February 2007, 12:42 PM

What would if suggest to you if i get a buzzing sound when using the ground lift switch on my DI box?

emrr · 19th February 2007, 02:56 PM

flip it the other way? not enough info....

vince @ speck · 19th February 2007, 04:31 PM

Quote:

Originally Posted by rx3000

What would if suggest to you if i get a buzzing sound when using the ground lift switch on my DI box?

No rule book for ground lift switches. Whichever position stops the buzz/hum is the correct position.

dementedchord · 19th February 2007, 09:06 PM

Quote:

Originally Posted by rx3000

What would if suggest to you if i get a buzzing sound when using the ground lift switch on my DI box?

??? dont use the lift????

rx3000 · 19th February 2007, 10:46 PM

ha , funny!
my assumption was the ground lift switch would help with some of the build up of hum that i'm experiencing, but yes it does sound better without it on.

kingneeraj · 20th February 2007, 12:27 AM

APOHStudios · 20th February 2007, 03:58 AM

It could be possible that the swich is wired backwards. Let face it, sometimes the gear we buy is initially assembled by, uhhh, let's just say less than skilled workers.

Easy to check. With the unit unplugged, check ground (pin 1 on XLR and Shield on TRS) and see if you have continuity (use a multimeter) between input and output. Switch your ground lift from one postion to another. When the meter "beeps", that's when the ground lift is not engaged.

Doc

structuredloud · 20th February 2007, 05:15 AM

Best title i've read in a while!

Tibbon · 21st February 2007, 05:25 AM

Is something that the DI is connected to on another power circuit? If so, it could just be a potential difference between circuit A and circuit B causing the buzz, not a ground loop.

amorris · 21st February 2007, 01:18 PM

answer: it is working perfectly.

a buzzing sound is usually indicative of no ground refernece. a humming sound is indicative of multiple ground references. so, if you are having a hum, and you ground lift at this point and you get buzz, this is probably not the point of the problem. dont lift the ground at this point, go somewhere else to find the multiple grounds causing the hum. remember, this could be the gtr itself, or anywhere between the gtr and the speakers you hear the hum/buzz in.

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19th February 2007, 12:42 PM	#1
rx3000 Gear Head Join Date: Nov 2005 Posts: 60	Ground Lift introduces buzz What would if suggest to you if i get a buzzing sound when using the ground lift switch on my DI box?

19th February 2007, 02:56 PM	#2
emrr Gear maniac Join Date: Dec 2006 Location: nc Posts: 241	flip it the other way? not enough info.... __________________ Best, Doug Williams ElectroMagnetic Radiation Recorders

20th February 2007, 12:27 AM	#6
kingneeraj Gear addict Join Date: May 2006 Location: Tokyo, Japan Posts: 493	__________________ - - - - - - - - - - - - Neeraj K.

20th February 2007, 03:58 AM	#7
APOHStudios Lives for gear Join Date: Apr 2005 Location: Upland, CA Posts: 1,064	Could it be..... It could be possible that the swich is wired backwards. Let face it, sometimes the gear we buy is initially assembled by, uhhh, let's just say less than skilled workers. Easy to check. With the unit unplugged, check ground (pin 1 on XLR and Shield on TRS) and see if you have continuity (use a multimeter) between input and output. Switch your ground lift from one postion to another. When the meter "beeps", that's when the ground lift is not engaged. Doc __________________ Doc Bernard, Quality Control Engineer http://www.avantelectronics.com For info, or technical question regarding our products, please contact support@avantelectronics.com http://www.myspace.com/apohstudios http://www.myspace.com/bengalvideoproductions

19th February 2007, 10:46 PM	#5
rx3000 Gear Head Join Date: Nov 2005 Posts: 60	ha , funny! my assumption was the ground lift switch would help with some of the build up of hum that i'm experiencing, but yes it does sound better without it on.

20th February 2007, 05:15 AM	#8
structuredloud Lives for gear Join Date: Feb 2006 Location: Oakland, CA Posts: 516	Best title i've read in a while! __________________ Wouldn't it be easiest if the best sounding gear also looked the best?

21st February 2007, 05:25 AM	#9
Tibbon Lives for gear Join Date: Jul 2004 Location: Boston/MA Posts: 4,062	Is something that the DI is connected to on another power circuit? If so, it could just be a potential difference between circuit A and circuit B causing the buzz, not a ground loop. __________________ David Fisher (aka tibbon) What is Noise, Blog (DIY, gear, tech, etc) Follow me on Twitter

21st February 2007, 01:18 PM	#10
amorris Gear maniac Join Date: Oct 2004 Location: winter park Posts: 198	answer: it is working perfectly. a buzzing sound is usually indicative of no ground refernece. a humming sound is indicative of multiple ground references. so, if you are having a hum, and you ground lift at this point and you get buzz, this is probably not the point of the problem. dont lift the ground at this point, go somewhere else to find the multiple grounds causing the hum. remember, this could be the gtr itself, or anywhere between the gtr and the speakers you hear the hum/buzz in.

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