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  #11  
Old 02-15-2009, 12:49 PM
grubbgto grubbgto is offline
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Posts: 44
Default Re: High-Pitched whine from MBox2 1/4" outs

Quote:
Originally Posted by jimst57 View Post
I think that may be because several things can cause hum/noise/whine problems, and different people find different solutions.

What solved it for me was using balanced cables from the Mbox2 outputs to my mixer. The whine is compleatly gone. If I put back the unbalanced cables, it comes back.
i had the same problem years back with the mbox before switching to the 002.
i bought balanced cables, and the 'whine' was gone immediately. it may not be an issue with your mbox/protools as much as it is an issue with your monitors, they are the ones that may want/need the balanced cables. do that first (it's simple and cheap) and you'll probably be okay. if not, you prolly have deeper issues.
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  #12  
Old 02-15-2009, 02:25 PM
jimst57 jimst57 is offline
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Default Re: High-Pitched whine from MBox2 1/4" outs

Quote:
Originally Posted by djgizmo View Post
How do you use balanced cables when the Mbox2 only has unbalanced outputs?

I have the same issue and I'm wondering how I can resolved it. Ground lifting didn't seem to work for me.
Here's a quote from the Mbox 2 manual:

Mon Out (Monitor Output)
These outputs support balanced TRS, or unbalanced
TS, 1/4-inch connections. To monitor
your mix, these outputs can be connected to a
mixing board, directly to a monitoring system
such as a stereo power amp, or another stereo
destination.

I bought some inexpensive TRS cables and the whine/hum was gone.
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  #13  
Old 08-26-2010, 11:08 AM
The Mink The Mink is offline
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Default Re: High-Pitched whine from MBox2 1/4" outs

My brand-new Mbox 2 Pro (Firewire) is also doing this - but only on the right output. If I plug the same speaker into the left output of the M2Pro, it's dead quiet.

I did all this:
(1.) Using good, balanced Mogami TRS-XLR cables
(2.) Tried another cable anyway, whine is still there
(2.) Tried ground lift, didn't work
(3.) Tried another computer, just to see - still there

Other notes:
(1.) Noise momentarily goes away when I make a change, like swapping out a Firewire cable, then comes back.
(2.) Noise goes away when speaker is unplugged from M2Pro.
(3.) Noise is still there with Firewire unplugged - just M2Pro power cable and speaker plugged in.
(4.) Noise goes away if computer is shut down (with Firewire connected).
(5.) It only does it on the right output!

This is driving me WILD. I hope something works...
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Last edited by The Mink; 08-26-2010 at 11:20 AM. Reason: more info
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  #14  
Old 12-07-2010, 09:52 PM
ricardex ricardex is offline
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Default Re: High-Pitched whine from MBox2 1/4" outs

before buying anything try this:



I put one in my mixer's (mackie 1604) power chord, and the noise disappeared just like magic...
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  #15  
Old 06-13-2011, 09:31 AM
Delso Delso is offline
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Location: Dorset, England
Posts: 89
Default Re: High-Pitched whine from MBox2 1/4" outs

Quote:
Originally Posted by grubbgto View Post
i had the same problem years back with the mbox before switching to the 002.
i bought balanced cables, and the 'whine' was gone immediately. it may not be an issue with your mbox/protools as much as it is an issue with your monitors, they are the ones that may want/need the balanced cables. do that first (it's simple and cheap) and you'll probably be okay. if not, you prolly have deeper issues.
+1

After reading this, I bought some balanced TRS cables to connect my MBox2 to my KRK Rokit powered monitors. As I got behind one of the monitors to make the connection, I spotted the word "Balanced" printed above the input on the back.

Doh!

Whine gone.
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  #16  
Old 01-16-2012, 07:58 PM
MMorrison MMorrison is offline
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Default Re: High-Pitched whine from MBox2 1/4" outs

Before you buy a Cheater Cable!!!

I did some research after reading all the posts in the thread and found numerous warnings that using cheater cables can electrocute (and kill) you if not used properly and, according to the articles I read, it has happened to a number of musicians trying to solve this very problem. If the ground isn't secured properly (or at all), it can be lethal.

If you're simply plugging in, you're not installing it properly.

Read more here -> http://en.wikipedia.org/wiki/Cheater_plug

From what I've read, it is recommended to use an Isolation Transformer which will allow you to do the same thing safely -> http://en.wikipedia.org/wiki/Isolation_transformer

After a bunch of testing, asking others, reading and thinking I had a ground loop problem in my house, I found that my high-pitched whine is likely coming from a slightly loose ground prong in the power input of the mixer I had connected to my MBox (though it could be something more internal too). Time for the repair shop.

Cheers
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  #17  
Old 11-02-2016, 09:24 PM
lezman lezman is offline
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Default Re: High-Pitched whine from MBox2 1/4" outs

Hi, I had the same problem. I solved it using Balanced TRS cables for all the inputs and outputs!
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