In my experience apt. conversions from single family are more prone to noise transmission. 

The technical term is Sound Transmission Class. 

If my Toyota needs transmission work, all I care about is whether my mechanic understands Toyota transmissions and how many of them he has fixed before.

The main reason/difference between this and the delivery of electrical energy is that the losses of transmission of electrical energy are generally less than 1-2% (that's why we use electrical transmission methods over long distances, generally speaking). 

I had an old Grand Marquis that I rebuilt the suspension, brake system, and replaced the entire transmission in the parking lot outside my apartment.

If you have the money, i would do that plus add a metal z channel going opposite direction of the joists ( screwed on top of the existing plaster ) and then add another layer of drywall. the Z channel leaves a space that helps in sound transmission. the problem is the sound is transmitted through the existing floor joists too, so just the insulation will not do it because the joists are still against the ceiling. this is something similar, but in this picture they used clips in combination to hold off hat channel from the existing ceiling which will lower your ceiling about another inch. 

They took a 5 acre parcel I had purchased to build new transmission lines and re-conductor old lines in order to provide power from a new utility scale solar generating plant (solar farm) they had constructed.My attorney hired the appraiser with only 2-3 weeks prior to the date our expert witness and discovery production had to be turned in to the courts.The appraiser found very low comps in the area.

I could have put a bandaid on as it still worked but I pride my houses in being higher end and good quality.As we continued with the house, I ended up putting in over the top finishes such as heated tile floors in the master bath and sound insulation under the hardwood floors to reduce noise transmission to basement.

My brother has a 70 442 clone, that has been laid up with bad transmission. 

I took auto mechanics in school and after work I would throw transmissions in cars or what ever it took.