Why so much audio??... you should only need it for the TA announcements on the radio... after this just listen to the ROARRRRRR
Sorry to sound ignorant, but what is the purpose of sound deadning materials?
-Reduce noise going outside of cabin?
-Reduce booming, reverberance in the cabin?
( does it really work in such a small enclosure? )
-Make the car heavier?
As cheapie (and effective) solutions...For RR Road Noise
Take the trim plastic out (gentle persuasion, required, but not difficult), plug every hole you see open on the body metal, with TAPE. Some are an open noise path from the wheel arch and floor! ( yes really!)
Open the RR strut Brace Trim, fit some foam type material (old mattress anyone? )
Test it and then decide if you need to buy expensive mats...etc.
Put too much and you might isolate that beautiful exhaust note...
Another recommendation I heard is to put some dampening material on the Subwoofer Face ( between inside face of the trim and subwoofer face. This reduces the booming effect, makes for a better bass feel and means you can hear it better at motorway speeds...
This is only some comments I heard, you audiophile gods will probably know more about this kind of stuff... I personally find the Bose SubWoofer makes me sick in certain songs with too much bass... re-arranging my internals... humm maybe I am just too old...
Where's my Norah Jones CD...