res bars usually give between 8 - 15 dB benefit, which is quite a lot. Make sure you fix into the bar making sure the screw doesnt go straight into the joist as that will reduce the performance. Spoke to a greeat guy at Protektor 'Mike' gave me all the info I needed he will also tell you what...
you could always re-board the ceiling and cut out a circle and create a step arround the center detail use a PVC flexi curved edge bead to finish off to....
Check out www.delsys.co.uk they should have all you need. Where some products show 13-20mm it would probably need some form of dabbing out. Top products will have a product to suit each of the finish thicknesses.
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