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New KRK Rokit 5's make Static noise

post #1 of 10
Thread Starter 

I just purchased a pair of Rokit 5 less than an hour ago.  They are big improvement comparing to Audioengine A2 soundwise.  However, the Rokit 5's make static noise while music is not playing.  They make static noise even only the power cables are attached .  Is this normal?  My A2 was dead quite while music was not playing.  My excitement was just diminished.  They are sitting on my desk about 2.5 feet away from me.  I just cannot stand this kind of noise.  It sounds like electromagnetic or radio frequency interference.   Any suggestion will be appreciated.

 

Update:  Noise was coming from USB connection from my computer to Audio GD 11.32 DAC.  I connected using an optical cable, and noise is gone now.  I need to find a way to get rid of the noise when USB cable is connected.


Edited by kwatch - 3/1/13 at 7:30pm
post #2 of 10
Sounds like it might be ground loop issues.
post #3 of 10

Ok, to clarify, are you speakers making static or a hiss?

 

If they are making a hiss, this is floor noise. If it is making crackling static noise, that has to due with a grounding issue. If you are willing to change to a balanced interface with balanced outs this would do wonders.

 

I have the Rokit 8's, I really like them, and have a Lexicon Alpha, running TRS 1/4's and there is close to zero floor noise.

 

Also, what do you have the volume set at on the Rokit's?

post #4 of 10

Oh, I just thought of a few things. Do you have a 2.4ghz router or wireless ( not cell phone) phone on your desk? Or do you have a cell phone that uses GSM (AT&T or T-mobile) that you keep on your desk?

 

So, in general, what electronic devices are in the room your computer is in?


Edited by TheRH - 3/3/13 at 5:27pm
post #5 of 10
Thread Starter 
Quote:
Originally Posted by TheRH View Post

Ok, to clarify, are you speakers making static or a hiss?

 

If they are making a hiss, this is floor noise. If it is making crackling static noise, that has to due with a grounding issue. If you are willing to change to a balanced interface with balanced outs this would do wonders.

 

I have the Rokit 8's, I really like them, and have a Lexicon Alpha, running TRS 1/4's and there is close to zero floor noise.

 

Also, what do you have the volume set at on the Rokit's?

 

computer => USB => Audio-GD NFB 11.32 => RCA = > Rokit 5                    Speakers make static noise. 

 

computer => Optical Cable => Audio-GD NFB 11.32 => RCA = > Rokit 5      Speakers make barely hearable hiss from tweeter  and hum from woofer

post #6 of 10
Thread Starter 
Quote:
Originally Posted by TheRH View Post

Oh, I just thought of a few things. Do you have a 2.4ghz router or wireless ( not cell phone) phone on your desk? Or do you have a cell phone that uses GSM (AT&T or T-mobile) that you keep on your desk?

 

So, in general, what electronic devices are in the room your computer is in?

 

I have 2.4 GHZ router and wireless phone about 10 feet away.  I keep Nexus 7 Wi-Fi and  Verizon 4G LTE phone on my desk with speakers and Audio-GD 11.32.

post #7 of 10

Ok you have answered all the questions then. First those "radio noises" are from you router, and if you are getting a hum, that indeed does mean you have a ground loop issue. This can either be cause by your house wiring or the power supply in your computer.

 

Here are my recommendation, move the router as about 10 feet from the computer. Second get a ground loop isolator similar to this http://www.radioshack.com/product/index.jsp?productId=2062214

 

Also, I would recommend getting a balanced audio interface similar to mine http://www.musiciansfriend.com/pro-audio/lexicon-alpha-usb-desktop-recording-studio or  http://www.musiciansfriend.com/pro-audio/focusrite-scarlett-2i2-usb-audio-interface

 

By using a balanced interface with TRS 1'4's you will reduce the floor noise, get rid of the interference, as well as gain 6 db in volume.


Edited by TheRH - 3/4/13 at 7:53am
post #8 of 10
Thread Starter 

Can the balanced audio interface you're mentioning be connected to my Audio-GD 11.32 DAC?   11.32 only has RCA out's.


Edited by kwatch - 3/4/13 at 8:47am
post #9 of 10

The audio interface would take place of your GD. 

post #10 of 10

I had exactly the same problem with static noise coming from my KRK Rokit 5 speakers. 

 

I opened up the speakers, capacitors were fine.

 

I took your advice and went to Radio Shack and bought their ground loop isolator.

 

Fixed the problem 100%!!!

 

I can't thank you enough!

 

THANK YOU! :biggrin:

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