unusual hum from MC2102

[TOGA]

Originally Posted by audioquest4life

Turn off and remove the listening device or transceiver buried inside the speaker, LOL. . This sounds like some form of inductance interference or something else. Quite strange for sure. Time to do some serious testing isolating the drivers independently. If you can, disconnect the crossover cables from the drivers. This may be very difficult depending on the way the speaker is designed.

I was somewhat joking about the electrical interference. If you have a test tool that can or know someone who can measure RFI/EMI, that might prove useful. Priest is also a good recommendation��

Hi, I turned off all lights, cut off main circuit breakers.
Still hum.

The hum is always constant in pitch and in loudness.
The level is very faint, limit of human hearing I guess,
Microphone on iPad can’t pick it.

It coming out from midrange drivers too besides woofers.

At this point I guess the inductors in crossover act like an antenna.

So with hum coming from both Mid and Woofer, I am not sure any more what is the origin source between LF or HF terminals.

The level of hum changed as I rotate the LF level knobs in front.

The speakers design allow for drivers and crossover removal easily.

ShAll I cover the crossover with something like this ?

http://www.oyaide.com/ENGLISH/AUDIO/...emi/pg530.html

The demagnetize track I tried did not help.

Toga