No one has mentioned that the probable cause of the woofer pumping is a mis-match between the cartridge and the arm. This will do it every time. It is a arm mass/cartridge compliance issue you should investigate.
There is nothing wrong with using a subsonic filter but it better to fix the underlying problem than to add a band aid, I think. The problem still exists, you are just masking it. Additive is usually subtractive in audio.
FWIW, just a thought.
There is nothing wrong with using a subsonic filter but it better to fix the underlying problem than to add a band aid, I think. The problem still exists, you are just masking it. Additive is usually subtractive in audio.
FWIW, just a thought.