You could try Newt25.zip for working out where the baffles can go, this can be found at
http://www.dalekeller.net/atm/newton...t/newtsoft.htm
I used rubberised foam with sticky backing in my 8" f7 Newt, worked great as light baffels aswell as a sound absorber. you could always wrap a couple of bits around the outside of the tube too, to absorb the sound waves.