Well guys Im finally back to report!
Its taken me sometime to report back as my findings were not as favourable as when I first started this journey.
I have discovered that all the rockwool in the world will just not solve "all" the problems in some rooms sadly to say.
I have stuffed on this last venture $2000.00 of rigid rockwool into every nook and cranny in the cinema to try and alleviate the 58Hz dip I had/have. Ive exhausted the experiment now, the dip is till there.
Its a room thing and its obvious that bass trapping can only do so much, its not a miracle cure for all aliments
I could keep adding more but I know from my measurements anymore rockwool added is doing absolutely NOTHING!
I have some more in the garage, but have stopped!
The whole of my front wall is now covered, some areas up to 20" thick, its insane!
Most of the rear wall is also treated up to 12" thick, there is not an inch left in the room to treat!
I have done everything else, crossovers, phase etc etc etc etc etc etc.....
Tried everything in the book, the dip will not go away without subs in the back row, I know!
As you will see the width of the dip is slightly narrower than before, but its still there in all its glory!
I ran a 63Hz tone, you can defiantly here the lack of sound in the MLP. Move ahead just 12" and its back loud and clear, so a dip as small as mine is still heard, or better to say not heard......
See the results after $2000 of rockwool. If they were store bought bass traps the cost could be double!
These rooms are a massive problem.......