How many db(A) below the noise ordinance can I produce and be safe from noise complaints? Can I file a harassment claim ?

So “long as the interference is substantial and unreasonable, such as would be offensive or inconvenient to the normal person, virtually any disturbance of the enjoyment of the property may amount to a nuisance.” - Prosser on torts. Basically, while you have not run afoul of the criminal statute, your conduct may interfere with the peaceful enjoyment that your neighbors are entitled to with their property. Moreover, signing the lease agreement may have added additional obligations of which you are contractually obligated to perform or, in this case, refrain.