On Tue, June 13, 2017 12:04 pm, jonetsu wrote: > Yes, that's the case. Just to add to this a tiny bit, cell phone > waves are way up there in the frequencies, so that cannot make such a > low pulsating interference. Not sure, but it seems that the cell phone > waves are modulated in the (very) low frequency range Yes, correct. GSM is especially bad in that regard, there is a time period when the signal must either be modulated very heavily, or is going between on and off or almost off. Quite annoying, but has the good property that interference is usually very noticeable, less problem of wondering if there is or is not a problem. > modulation is what's picked up by the (magnet of the) speakers. Unlikely to be the magnet. The speaker model you mentioned previously is an active speaker, with an amplifier built in. The first stage of the amplifier is likely sensitive to interference. The junction of a transistor is the same semiconductor structure as a diode, which can be used to demodulate AM radio. In essence the amplifier built in to the speakers was designed without proper protection against radio frequency interference. -- Chris Caudle _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
