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[Robert Sims]

Would like to get tips on isolating fixed installed flown subs from the building structure. I've had recent issue when fastening to the building's red steel and flying via cable. It transmits a lot through to the steel.
Sort of fun to turn several thousand square feet into a vibrating mass. Not sure the admin side of the building cares for it.  

Single cabinet dual 18's.

[Tom Young]

Mason Industries makes various acoustic/mechanical (vibration) isolation hardware. I do not know if they make anything for overhead suspension, but they may.

http://www.mason-ind.com/HTML/index.html

[Rob Timmerman]

There are vibration-isolation mounts designed for HVAC units available that will probably work for your application.  A variety of manufacturers make them; Google yields quite a few hits.

http://www.google.com/search?q=hvac+vibration+isolation& hl=en&client=firefox-a&rls=org.mozilla:en-US:officia l&hs=jHQ&start=10&sa=N

[Karl P(eterson)]

Now that I think about, I don't know if it is approved for the type of overhead this is or not, but I know some past contractors I have worked with have used this stuff from Mason, and it has worked very well.

You will probably need to get a structural to stamp off on it.

http://209.200.80.33/html/h610v8.pdf

Karl P

[Brad Weber]

Considering that these type of isolators are intended for supporting piping and overhead mechanical equipment (inline blowers and pumps, ductwork, fan coils, VAV boxes, etc.) and suspended ceilings in acoustically critical applications, I'm guessing they would be appropriate.  Kinetics Noise Control and The VMC Group (which includes Vibration Mounting and Controls and Amber/Booth) are some other manufacturers.  I have always gotten good support from these firms, I'm sure they can help you select the proper models.

[Michael 'Bink' Knowles]

I'm going to play devil's advocate and say that if your subwoofers are moving a lot of air, then no amount of rigging support isolation will work. The air itself moves the floor above.

For max isolation, you'll need both mechanical rigging isolation and a room-within-a-room type of acoustic isolation.

-Bink

[Robert Sims]

Tom,
Thanks for the link. I like the neoprene hangers HMIB. I think I'll use that in conjunction with some neoprene at linkage points. The HVAC guys love to hang their duct off the same structures. Their registers start vibrating like a wash board some times. This should help isolate some of that.

Bink,
The latest application is a theater with all flown subs (orchestra pit). I'll be pushing a little harder than normal. On that path,  The proscenium is concrete block and I like to hang them backed up to the wall. That would put the drivers facing straight out. Not sure that matters. Consultant has (2 per side) SB750's filling in between LRC's. (LSSCSSR)

Thanks all.