Not exactly Operation Overlord I know but getting all the bits to complete the task was painstaking as all the items were free I've done the job based on what others have done but I'm not sure if it's correct so please report any errors The subwoofer is the new B&W ASW 675 which is connected at Line Level with the front speakers for musical performance, my movie sub in the form of the Servo 15 arrives Thursday. What Each Slab Weighed The Rubber Mat I Used For Insulation/Protection Rubber Pads On Floor Ready For 1st Slab 1st Slab Down Base Of Sub With Rubber Feet Sub In Position And Ready For The Top Slab The Finished Article THE RESULTS - The B&W sub was allready very tight but now not only is it tighter but I could turn up the volume on it as there was no hint of boomy bass. Cone excursion on the sub has reduced also which is a good thing of course. Downstairs directly under my room you used to hear every bass note eminating from my room but now all you hear is the treble sounds, excellent if you have neighbours under your AV room IMO. I used Moby's "Play" album to test the bass performance of the new setup and where previously I set the sub volume just below boomy sound I found myself turning up the volume on the sub to reach an astonishing level of bass, mimicking a nightclub albeit without the ambience and vomit Another test I gave the sub was the two MP3s I have which go way down to 5Hz and 7Hz respectively, previously the 5Hz MP3 (1812 Overture) at loud volumes made the B&W turn itself off as it was too much for it to handle. This time I could play the same MP3 at that same volume but also with more sub volume, the B&W is quoted as a 17Hz capable sub so it was quite an impressive bass performance, especially witnessing a can of pepsi rattle at the other end of the room I can't report what the slabs do for movies as the B&W is there for music so apologies on that score. Anyway, please feedback your comments.