LVP in condo with concrete floors - Sound Barrier Underlayment

last month

I am looking for new flooring for my 2nd floor condo that has concrete floors and decided on using LVP. My condo has a 70% carpet/rug rule and I was hoping to find a way to reach this using a sound barrier underlayment such as QuietWalk Luxury Vinyl. The issue I have came across is that most of the rigid core LVP floors come with a pre-attached underlayment and using another underlayment voids the warranty.

Is using a underlayment underneath the pre-attached underlayment going to make a noticeable difference when compared to just using the pre-attached underlayment?

Are there any particular rigid core LVP products I should be looking at which would allow me to use a sound dampening underlayment?

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