Marius,
Thickness of insulation in new wall.. I'd make it 4" if possible. Using 4" steel studs... Use anything that is close in specs to the Owens-Corning 703, which does an excellent job.
As for the layer of asphalt-sheets - not worth the trouble or expense. If you want great isolation, get the Green Glue.
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The production company bought (before I started working here in august) a whole bunch of Ecophon Wall Panel™ A/Texona, 40mm. The sales rep told them that covering the walls and ceiling with this would be a perfect solution. Well, looking at the sound absorption coefficient chart, the absorption drops dramaticly at 500Hz and below, so no bass trapping. Kind of makes sense with the 40mm depth.
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You could probably stack these together... or mount them with about 40 or 50 mm of airspace behind them to improve the LF absorption. - yes it will be pretty dead.. but after you get past the early reflection zone you could put up some polys or something similar to brighten up the back end... i dunno - it's soooo small..
AC is a whole 'nuther thing. We can get to that after you've got your design.
