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Glad to hear it is floating and islolated. This is extremely difficult to achieve Is there absolutely no common ground between the walls/frame of this inner box and the entirely separate outer structure.
If so, can I hire you- ;-).
Without a lot more detail to be fully certain, I reckon it would be safe and best to go with Batts in the void. I can't see a downside if they are loosely fitted. I am unclear about the whole design concept. Is this in fact a four leaf walled box? Why the 'soundboard' etc. ? Also the half inch gap between the walls? That seems like a very small gap. Is this a design you found somewhere, and could you show the plans?
Dan FitzGerald
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