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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 6 responses by mphipps

mphipps's avatar
mphipps
6 posts
 

The stylus is not on the record. How could it be feedback? The hi pass filter is engaged on the phono pre. 

mphipps's avatar
mphipps
6 posts
 

I wonder if anyone knows why this is occurring?

mphipps's avatar
mphipps
6 posts
 

The video shows that the platter alone does not cause the woofer pumping 

mphipps's avatar
mphipps
6 posts
 

Thanks, I checked google- nothing for this issue. The issue being woofer pumping when phono cartridge is within 1/4” but not touching a spinning vinyl record.

Switching to single end puts a stop to the phenomenon. However the question remains- what’s this all about?

mphipps's avatar
mphipps
6 posts
 

Thanks, I guess I need to clarify my original post.

 

mphipps's avatar
mphipps
6 posts
 

I didn’t try all my albums- it did it with probably half a dozen.

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