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My question is: is it better to use this wool to fill the air gap between new plastered wall and existing brick wall for isolation or is it better to use it for absorption inside the room?
2.) Would there be any benefits for isolation if I would leave addional 2" of air space between new wall construction (i was thinking of 2") and existing brick wall? I know for absorption it is better to have air space behind insulation
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Wool in the air gap dampens resonances in there. It should be a loose fit, not stuffed.
It can improve the sound isolation by a decent amount, I would expect 6dB or so.
The bigger the air space the better. Again the loose fill.
These two leaf structures with a dampened air gap are a system. The individual elements, e.g. wool, have different meanings else where.
You might take a look over here
Noise Control
Inside the room, fabric wrapped 703 makes a fine absorbing panel. DIY versions of these and the StudioTips SuperChunk are covered extensively at
studiotips - tips on studio design, acoustics, and wiring
Best, DD