Low frequency rumble can come from lots of things. Some of the old RCA Living Stereos made in London have rumble from the underground (subway). Air conditioners can cause it, so can truck traffic outside the recording venue. This is 'audible rumble' that is easily heard if you have speakers which do deep bass. Not a clue what the high pitched sound might have been - not something I have experienced.
Nsgarch, FWIW a rumble filter principal purpose was to reduce the amount of low frequency resonance (in the inaduble regions) caused by mis-matched mass and compliance issues involving cartridges and tone-arms. The most obvious evidence of such rumble was watching the woofer cone flutter away even there was little apparent bass in the music. The driver is trying to reproduce those 7hz+/- frequencies and soaking up a lot of amp power doing so to the detriment of the audible frequencies. The rumble filter could help, but not solve, the mis-match. Don't know why manufacturers dropped them - maybe its because since most vinyl systems are now used by very knowlegable set up folks its not the issue it used to be for the plug and play croud.
Nsgarch, FWIW a rumble filter principal purpose was to reduce the amount of low frequency resonance (in the inaduble regions) caused by mis-matched mass and compliance issues involving cartridges and tone-arms. The most obvious evidence of such rumble was watching the woofer cone flutter away even there was little apparent bass in the music. The driver is trying to reproduce those 7hz+/- frequencies and soaking up a lot of amp power doing so to the detriment of the audible frequencies. The rumble filter could help, but not solve, the mis-match. Don't know why manufacturers dropped them - maybe its because since most vinyl systems are now used by very knowlegable set up folks its not the issue it used to be for the plug and play croud.