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:

Mystery Woofer Pumping

I could type out all the details but the video pretty much covers everything. I thought ya’ll might be interested in this.

 

mitchellcp

What kind of table & arm?  With that nice cartridge, I’m guessing it’s probably a pretty good quality one but it seems to me that if this only occurs when the platter is spinning, it’s a mechanical / vibrational issue in the plinth / tonearm connection, /suspension components or maybe the bearing.  A relatively cheap stethoscope you can get from CVS can help to locate the culprit. 

The OP clearly stated and also shows in the video that he’s using a Yamaha GT2000L, a very fine vintagE DD  TT with a coreless motor. So far as I can determine that platter is all aluminum. Which is why I asked about the platter mat, wondering whether it might be ferrous. I know nothing about the Funk Firm, but I’m guessing it contains no iron or copper.

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The video already answers most of the questions and discards most of the solutions being discussed, please take a look before making a suggestion:

 

Static charge is the best explanation yet. I use an AQ Anti Static brush but it didn't do much if anything.