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R-15PM speakers suddenly take minutes to start up and make strange noises in the meantime


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My Klipsch R-15PM worked for years perfectly fine. They are plugged in 24/7 (so they don't lose the volume configuration that I set via remote control).

 

Now suddenly, when I turn them on the next day, they are unresponsive for minutes until I can finally use them. During this, they make strange noises and the LED is flickering accordingly. Pressing any button on the remote has no effect. I have recorded a video here (I had to increase the volume significantly as my phone could barely pick up the noise):

 

 

What happens here:

  • Initial setting (from the day before) was optical source (red LED) (personal PC)
  • I start the day by pushing the USB source (white LED) button (work PC)
  • weird start-up begins which takes minutes
  • at 3:15, the speakers stop being unresponsive and behave normally (the LED goes on and off a few times)
  • I am now able to switch to USB source and the speakers work fine the rest of the day

 

Does anyone have a clue what the issue is? I already looked for a firmware update but for this model there is no such thing.

Edited by halloei
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