Dear hardwood gurus,

I've got 3/4" solid nail-down hardwood (Kempas) that I'm looking to install in my second-floor condo in such a way as to minimize impact noise filtering down to the unit below.

I understand that there are cork and MLV underlayment products available, but since this is nail-down, I'm afraid that they may be ineffective since I'd be puncturing the acoustic membrane. I've read that a possible solution is to install cork and then add another non-nailed-down layer of plywood on top of that, upon which I'd nail the actual hardwood. Is this or any other approach suitable to minimizing impact noise in my situation?

Many thanks,
Ryan