MLV double layer with or without gap?-Acoustics Forum-Acoustic Fields Forum

Hi, I’ve got some loud neighbors. I’m looking to help reduce the noise bleed coming through the walls. If I’m to deploy two layers of MLV, would it be better to stack them directly on top of each other, or would it be better to mount one layer of MLV, then have an air pocket, then MLV again?

From the (great) video series acoustic fields provides, I’m lead to believe that I want the greater mass, therefore the first option, right? I’m primarily looking to decrease the bass frequencies and will also deploy a double layer thick drywall to help reduce upper frequencies.

Thanks in advance for your suggestions!