These low frequencies are inherent in the acoustic resonance of large spaces. Therefore present in all music that is well recorded in a large space.Nonsense! It’s only present if the material was not filtered, which was often SOP for records. Any or all of the microphone, input channel, mix output, cutter could have been filtered to make the disk more playable.
OTOH, some unfiltered large space recording have enough sub-audible low end to put a plate amp sub into thermal shutdown. Adding a 12v 100 or 120mm computer fan run on ≈3.5vdc will keep the amp cool and dramatically extend its life.
see http://ielogical.com/assets/WinterBlues/Force_Fan.jpg Airflow is toward plate to force air up the channels.
The fan is held in place with the compliant mounting plugs. Even Saving Private Ryan or Telarc 1812 w cannon won’t shake it loose.