What is the Best Sound Isolation underlayment 4 ceramic tile

[herbolaryo]

There are several sound isolation underlayment available for ceramic tile flooring.
One of them is this...
http://www.laticrete.com/Homeowners/Products/Underlayments/tabid/218/Default.aspx


It is important to have noise reduction especially for second floor installation.

I understand that there are ratings for noise reduction like Impact Noise Rating (INR), Sound Transmission Class (STC), Impact Insulation Class...
I understand, the higher the number, the better it is.

What is the Best Sound Isolation underlayment available for ceramic tile flooring?

 

[guy1976]

google schulter systems they do sound proofing systems