I have a 2010 roadster and I do not have a problem with interior noise with the top up, and I don't recall seeing any roadster owners complaining about cabin noise. In a way this seems backward - cabin noise is something many convertibles have, and in car reviews of rag tops they will always comment on interior noise. I think that this re-enforces the conclusion of Guard Dad that most of your noise is coming from the hatch area. The compartment in the Z that holds the top in the down position is enclosed, so sound doesn't come forward.
Nissan uses a double fabric top to reduce noise like the Z4 has, and it reduces noise from the outside.
Ironically the disadvantage in the roadster is that the "sub woofers" are mounted behind the top compartment and a lot of bass doesn't make it through. It would sound a lot better if those speakers were mounted right behind the cabin, but my guess is there is not enough room there when the top folds in.
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