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

@fsonicsmith I thought that if I got continuity from cartridge white pin to XLR L pin 2, blue to L pin 3, red to R pin2 and green to R pin 3, and if George Cardas welcomed to the right channel on the right side and in phase was in the middle I was pretty good. What did I miss?

Have you tried putting the record on the metal platter (without the record mat)?

How 'bout the mat with no record?

At least you'll isolate the offending object.

as per previous post 

A- Pumping exists when the system set up is: Balanced output from tonearm to balanced input at phono preamp and:

  1. Stylus is over the play surface and the platter is rotating- not off to the side (it also persists with the stylus on the record).
  2. There is a just a record on the platter (rotating)
  3. There is a just a mat on the platter (rotating)- the mat is a synthetic material.
  4. There is a mat and a record together (rotating)

B- Woofer pumping stops when:

  1. There is platter rotation and the platter is empty, no record, no mat
  2. There is no rotation regardless of what on the platter.