So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2

+1 @cleeds feedback. Your turntable is too close to something like a speaker etc.

Do you have another cartridge to try? That would eliminate some guessing.

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

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

PVC cannot hold a magnetic charge, though compounds used may be magnetized so to the question is whether this happens with all lps or just one.

Hey OP, goto the top of this page, where it says "search discussions..." and type in "pumping". LOTS of people had this problem.

BTW, have you ever heard of "clarity vinyl"? This is vinyl with NO black stuff included (clear vinyl). The reason it is clear is some feel the black stuff generates some kind of magnetic interference. If you're cartridge is super sensitive, it may be generating enough current to make the woofers "pump". Try your test using clarity vinyl.

Wow that's a lot of homework. As much as I would love to, I'm not going to re-create the thing I just got rid of without some possible explanation as to what was going on. It's working in single end mode and sounds really nice.

Phono stage is an ELAC PPA-2 and yes it has a balanced input option on input two. It's activated with DS 3&4.

I did the test with and without a platter mat. Platter mat only creates the pumping. Record with no mat creates the pumping. Platter with nothing- no problem.

Mat is a Funk Firm Achromat. 

I didn't say anything about DC on an AC line. (..........never mind)

Cheers

Sorry but you have to prove that balanced input makes a difference by reverting to XLRs and re- testing. Also, is the phono stage actually balanced or does it just offer XLR inputs? Also retest with vs without platter mat. Also, what platter mat? 

Has nothing to do with DC on the AC line by the way. DC is DC; has no frequency. 

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?

Haven’t heard about this problem for 20 years. I think it has something to do with DC on your AC line. Will have to wait for the experts to return from the Super Bowl tomorrow...

Also, cut and paste the following line into google:

Cause of woofer Pumping in your speaker

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

If TT is turned off, does problem go away.? If so then I propose that the spinning platter has some iron content and this is inducing a very low frequency signal in the cartridge which is then amplified and affects the woofers.

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

If you can’t get it sorted out, I have a KAB rumble filter that would do the trick.  I am not using it any longer and I could give a good price on it. Food for thought. 

It’s feedback. Move speakers away from turntable.

I wonder if anyone knows why this is occurring?

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.