fsonic, Mea culpa. A thousand apologies. It was Holmz who wrote the sentence I quoted (and responded to), not you.
So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2
I observed the weirdest thing I have ever seen in audio. With the cartridge positioned above the record, tone arm locked up and platter spinning, the woofers were pumping on my system. I googled every permutation of query I could think of but came back with no hits. That’s when I decided to video the problem- link below:
I could type out all the details but the video pretty much covers everything. I thought ya’ll might be interested in this.
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It is super interesting. Sure, it is possible, that it is somehow related to wiring… but I doubt it. When I had a 50 Hz hum it was also from a magnetic field, and the coils in a MM or MC cart are effectively a magnetometer. If it is only doing the pumping when the mat is on, then I would think that removing the mat would be a possible strategy to use to ameliorate the pumping. |
Everyone is focused on magnetism. This phenomenon is not magnetic. Something else is causing the cartridge to output a very low frequency signal. The cartridge is a very sensitive vibration measuring device. To output a signal all you have to do is move the cantilever. An unloaded cantilever hanging in the breeze might be sensitive to air currents. Blow gently on the cantilever and watch the woofers. For some reason the spinning platter with either the record or mat loaded produces an air current that the plater alone does not. Loading the cartridge differently by going from single ended to balanced configuration could change the damping on the cartridge enough to bring this out? @mitchellcp , I also run balanced but other than blowing on the cantilever, I can not replicate your situation. |
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