100 MHz signal at the speaker out of my AV amp

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Hi, there.
Arcam Alpha AV 50 amp, only connected the power cord with source input.
Then, connect speakers, a low volume noise from the tweeter.
Use an oscilloscope and measure a 100 MHz signal at the speaker outlet
behind the amp.
Disconnect the speaker wire, same 100 MHz signal. Disconnect the
power cord to the amp, same 100 MHz signal.
Question: Could this 100 MHz signal causes the speakers to put out
some subharmonic audible noise? What else could be wrong? Where
should I look for the problems?

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Topic - 100 MHz signal at the speaker out of my AV amp - CL 12:54:47 02/18/00 (1)

Re: 100 MHz signal at the speaker out of my AV amp - al 06:32:26 02/22/00 (0)

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