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continous output 500kHz and ca. 500mV 4 years 2 months ago #31879

  • Kunzmann
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Dear community
All four (i have two PWR-ICE 125 and two PWR-ICE 250) of my PWR´s have an output of ca. 500kHz and about 500mV measured with an oscilloscope.
I think this is the the triangle square (or saw tooth) pulse generator of the ice power class D module. But i thought there is a low pass filter before the speaker outputs ? Regardless of any Input (or no Input all) there is always this ca. 500 kHz signal.
Two questions:
This means the all speakers will be loaded at any time with this signal. Will be there any problems with magnetostatic or electrostatic tweeters ?
Is it possible to built a low pass filter to stop this signal from the speakers output?
Or all of my four PWR´s are damaged?
Thanks for helping
Thomas
P.S. in principle all four PWR working perfect.

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continous output 500kHz and ca. 500mV 4 years 2 months ago #31891

  • dreite
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That's perfectly normal for this type of amplifier.
You could filter the output further if you like......but I don't think it's necessary.

Dave.
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continous output 500kHz and ca. 500mV 1 year 1 month ago #49289

  • Bmeeks
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how would you go about filtering this 500khz signal before the speaker but after the amp???

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continous output 500kHz and ca. 500mV 1 year 1 month ago #49311

  • xnwrx
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A small capacitor in parallel with the tweeter.
But anyway, this HF signal should not be a problem : your tweeter (or any HP) behaves itself as a lowpass filter and the membrane does not move at all with such a high frequency
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