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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

Showing 3 responses by noromance

noromance's avatar
noromance
10,054 posts
 

Kudos to @dadawada 

noromance's avatar
noromance
10,054 posts
 

OP, You also said that the pumping frequency of the cone was directly proportional to the hand-powered rotation of the platter. Surly the static build-up would be caused by rotation speed? When you moved the platter by hand, wouldn't the static be grounded by your touch?

noromance's avatar
noromance
10,054 posts
 

Looks like something I saw recently. The guy was using a balanced cable from his table to the phono amp. Changing it to RCA fixed the issue.

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