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URGENT HELP pro tools noise problem
Old 1st February 2009
  #1
Here for the gear
 
🎧 15 years
URGENT HELP pro tools noise problem

ok i've been pulling my hair out tonight trying to track down this problem, please listen to the attached 5 second file. i thought this was a power problem with my pro tools rig, after tearing apart my rack i finally hooked up my m box to laptop WITHOUT ANY POWER CONNECTED. i boosted the noise by 20 dB so you all can hear it clearly. there is nothing hooked up to my system. this is just my laptop hooked up via USB to an mbox and it gets this audible and visible noise. i have a session tomorrow. any idea would be greatly appreciated.
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URGENT HELP pro tools noise problem-picture-1.jpg  
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Old 1st February 2009
  #2
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ryanojohn's Avatar
 
🎧 10 years
are you on a macbook pro... with the metal casing?


try plugging it in with the AC adapter... the three prong one.
Old 1st February 2009 | Show parent
  #3
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Branko's Avatar
 
🎧 15 years
Did you have the mikes (or any other load) connected to input when you recorded this noise? Open mic input, with a lot of gain produces this kind of noise.
Branko
Old 2nd February 2009 | Show parent
  #4
Here for the gear
 
🎧 15 years
thanks for the fast reply
-yes im using a mac book pro, that noise exists if the power supply is hooked up or not.
-no mike is plugged in and all pots are at zero
???
it must be my cpu or radio interference right?
Old 2nd February 2009 | Show parent
  #5
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TVPostSound's Avatar
 
🎧 10 years
Get a better USB cable (better shield), and plug it into the right side USB port.

I ended up buying the Monster (ugh) Ultimate USB Cable. Per others recommendations.
Old 2nd February 2009 | Show parent
  #6
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ryanojohn's Avatar
 
🎧 10 years
I've seen that issue a lot on the Macbook Pros, and the sound usually changes goes away when you plug it in using the ac adapter with the 3 prong edison, if you use the 2 prong it doesn't really change anything. Otherwise I'd say try doing it in a different room,


or you could always wrap your computer in aluminum foil and duct tape heh
Old 2nd February 2009 | Show parent
  #7
Here for the gear
 
🎧 15 years
thanks fellas but the problem magically went away. studio voodoo... time to rewire my patchbays...
Old 2nd February 2009 | Show parent
  #8
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Aisle 6's Avatar
 
1 Review written
🎧 10 years
That sound is definitely hash caused by some electronic device. My first guess would have been laptop power supply. But you have obviously ruled that out. I always found the M-Box (USB) connections were more prone to induced noise. I would definitely check if there were switchmode power supplies on the same AC circuit as you recording rig.
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