• Repairing Thomann Box – bad hum

  Repairing Thomann Box – bad hum

  Posted by saratanaka on November 8, 2021 at 5:35 pm

  Hi folks,

  I have a Thomann the box 350w powered cabinet https://www.thomann.de/gb/the_box_pa502a_aktives_fullrangesystem.htm that has recently developed a very nasty hum (after having returned from a repair shop that cannot fix it).

  The hum is so loud that if I turn the volume to even the first notch it feels like the speaker might blow!

  If no XLR cable is plugged in then the hum disappears, and if I plug-in an XLR to minijack cable (which probably has no grounding), there is also no hum. But if I use other XLR cables, the hum returns immediately, even if they are not plugged in.

  Any ideas what this is and how to fix it?

  Many thanks!

  Matt

  saratanaka replied 2 years ago 1 Member · 0 Replies
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