Low frequency sounds from a sub below 20 hertz are usually felt as vibrations rather then heard. |You cannot really measure the true effect with a sound pressure meter.
When testing my home theatre construction, using a well built sub played at 1 quarter reference level it could still be felt two floors above a sound proof room. Due to the prohibitive cost I basically gave up on that effort and focused on screening the highs out. Low frequency noise cannot be screened out by wooden walls or drywall.
That being said, this issue is really between the landlord and the tenant, if it reasonably interferes with her right to peace and quite, she could demand rent abatement from the landlord. Typically in a case like that the landlord will not take action unless there are two complaints from seperate units or the complainent formally demands abatement.
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