Why are my woofers pumping?

Dear @o_holter : Seems to me that you don’t have a real problem between your SME and the Lyra cartridge in the resonance frequency, you are safe there.

What " alternatives " left other than that. Thinking " loud " some things could be stay happening:

maybe to many playing hours in that cartridge that in some way affected the cartridge suspension or stylus tip or both, only for you can be sure re-check all the tonearm/cartridge set up parameters: VTF, VTA, overhang, offset angle, etc, etc., if you have a different platter mat you can try it and see what happens, same with the use of a platter clamp and if you are not using it then try one, could exist a very low bass oscilations developed in the phono stage so browse from somewhere and make a change of phono stage only for testing, you can try too to put some kind of damping material as bluetack between the cartridge top plate and the tonearm headshell, you can damp the SME arm wand with a elastic thread around t in helicoidal way ( in the past Sumiko marketed this kind of trap to damps the arm wands and made it a great improvement always. They used a ligthly elastic material. ).

Could be another reasons that explain such behavior? could be but rigth now those are some things you have to check and see what happen.

I assume that you did not any change in your system/roo but the same as always only that you do not noted before, rigth?

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

cut off below 10hz? as invictus said that will degrades the cartridge signal and in the other side you do not know at which bass frequency is the problem, seems to me more lower than 10 hz but as you I can't say for sure.

Thanks, Raul. I will test some of your suggetions - platter mat - and report back. But like I said before, it seems very basically "physical" - it happens before eventual mechanical turntable etc problems.

@o_holter : problem is that you just noted it and could be many thing. Even that speakers can't reproduce the frequency the woofer movements are affecting the quality level performance of what you are listening.

Even a mistmatch impedances between phono stage and line stage could be ( for whatever reason. ) the source. The electronic very low bass oscilations are more frequently that what we can imagine.

You have to make several tests about because exist no rules to make a sure diagnosis about.

R.

o_holter

Thanks Cleeds, but I don't agree. Please prove the case. Why does the arm kill the cartridge?

The SME V is a terrific arm, but your woofer pumping problem simply suggests you've mounted the wrong phono cartridge to it. There's no reason to suffer such a problem, imo, and using a subsonic filter is treating the symptom rather than the disease.

Question for @o_holter : Did you buy this cartridge used?
If so, all bets are off. You can't be exactly sure of what you have.