I’m miffed

High Pitched Tinnitus-like tone from M1Active 520 Studio Monitors

I have a High Pitched Tinnitus-like tone from my M1Active 520 Studio Monitors. It has recently appeared in both monitors, even when the *only* thing plugged into the monitors is the power cable. I'm using balanced XLR >TRS cables into an Mbox 2 pro. Any ideas what could be causing this? Or how I can troubleshoot it? Thanks!
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  • Hello Hans,

    Thanks for the post. I'd like to help! You may have a Ground Loop issue. Check out this helpful article here to help you out with that and hopefully rectify your issue.
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  • Thanks! ...I've tried the following things to identify the issue.

    I've relocated the studio monitor to a different part of the house, plugged into the wall with power cable. Turned on the M1Active 520 ... and the high pitched whine is still present.

    Do I need some sort of transformer or something between the wall socket and monitor power supply cable?

    Thanks for the link - Its a good read, but i'm having a hard time understanding some of the technical (electrical) terms.

    It seems like the ground loop elimination techniques are talking about putting isolators or converters in between the monitor input and the source (in my case the Mbox 2 pro) ...but in my case the noise is apparent with NO input connected

    Thanks again! Let me know if I need to clarify further.
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  • Hello Hans,

    No, you shouldn't have to use a transformer with your setup. If you relocated to a different part of the house and you have very minimal cables connected then it may very well be the speakers or your cables. Try a different set of cables. If the whine continues after that, call into Alesis technical support for servicing options - www.alesis.com/support.
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