What's the best isolation system?

Yo Lugnut! I'm pretty much on the same page with you about concrete slab construction, spiked stands and 3/4" MDF, but will add aluminum cones work better than brass or stainless on concrete....I moved into the new old house a couple years ago and figured I would have a lot of trouble with the 3/8" glazed in place windows behind my system and that just has not been the case at all....As far as very sensitive items like transports (the clock) and turntables I really like an active air suspension, but these aren't cheap.....I'm sort of in the cone business as an outgrowth of the preamp business so I have had access to a machinist to make up various cones for me of aluminum, brass, stainless and combinations with Delrin, a machinable hard plastic....On concrete slabs aluminum or stainless/Delrin combination works best and on pier and beam flooring brass seems to be the material of choice....No set rules for any of this other than active air suspension which is the cat's meow....

Hey Lugnut! The speakers are out from the wall about 6' and there are no drapes, but mini blinds.....First reflection fires into record shelves 8' wide by 7' tall on each side wall.....Go to Audio Asylum and go to rcrump Photo Gallery and you can see how it is set up....I had Marty DeWulf here in March and he took measurements as the room is just sensational, best I have ever had....It was an add-on to the house about ten years back before I lived here....15'7" x 23'7" x 8'6" with an 8' opening at the back that drains bass into two other rooms for another 30' or so....I'm sort of in the cone business (obviously not real serious about it) and have some 1.5" tall x 1.5" diameter cones with a .5" shoulder at the top drilled and tapped for 1.5" long 3/8-16 case hardened steel hex socket set screws...These are black anodized aluminum.....Made some speaker stands out of .5" aluminum and had them grain sanded and black anodized to match the Speaker Arts speakers we used at the CES a few years ago.....These were boxes about 12" x 15" x 24" as I recall and they were completed a day or two before I had to leave for the show.....These weighed about 60-70 as I recall and I filled them with old clothes or whatever to keep them from ringing.....Bottom line is I had about 2K in these and they sounded worse than the steel stands I had for the little speakers...TAS wrote us up as having nice sound at the CES, but think I would stick with steel tubing....Regarding turntables I think the way to go is an active Vibraplane or if under 40 pounds a Machina Dynamica Nimbus....My turntable has a built-in active air suspension BTW and is very heavy, well over 250 pounds as recall shipping weight was 550 pounds, but that included the 90 pound pump....(I have a sport model Rockport, a holdover from when I used to make a real living) Oh, if you can find some wide maple boards and have them put together with biscuits (hard to find maple more than 8" wide) you might give that a try as the 3/4" maple is actually a bit more open sounding than the 3/4" MDF, but don't go with butcher blocks......Geoff Kait has done the research on this when he was building the Nimbus active air bases at Machina Dynamica and you might want to go to his site, www.machinadynamica.com and shoot him an email regarding the maple....Good luck with the new rack!