I am looking into soundproofing underneath my carpeted floors. I can hear the downstairs neighbor talking on the phone and they hear me as well. They also experience a lot of impact noise from my walking around. I see that this forum endorses MLV with closed cell foam on top of the subfloor with rebond carpet pad and carpet on top. A competitor soundproofing company endorses use of very dense/heavy rubber padding on the subfloor with carpet pad and carpet on top of that. How can I determine which will work better?