Low frequency problem while playing vinyl

It could be arm and cartridge mismatch. Resonating above 12hz.

Dirty bearings? Warped records? London recording of Tales of Czar Saltan?

Here's a test, with the turntable off, not rotating, place the cartridge on a record. Slowly advance the volume to the level that you commonly listen at. If howling begins, back off. You have found out that you have a problem with acoustic feedback and if it is structure borne, you will have to change the structure on which the table sits. If it is air borne, you will have to site the turntable somewhere else.

This is usually only a problem with vented woofers, which are unloaded below their primary resonance. Acoustic suspension woofers remain loaded and will not show this kind of response problem.

Rumble or not, it's still feedback. The primary issue is not on what, but where the tt is placed in relation to the speakers.

Thanks for your responses. I did some more testing to locate the problem. The low frequency signal seems to be generated by the phono pre amp (VALVET soulphono MM/MC tube phono amp‏). With the phono pre amp hooked up to the pre-amplifier (Krell Evolution 202), without the turntable connected the woofers go crazy when I turn up the pre amp volume.