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Safety--or lack thereof--of dual pole-mounting

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Daniel Postilnik:
Assuming they can be made to fit, is there a way to calculate the safety of mounting two speakers on the same pole (using the onstage stands dual-mount adapter, 20" wide)? The idea is to have a little bit of virtual horizontal array with the tops (Community S-3294 - 17.4" wide) when I don't have the option to just stack them on top of some tall dual 18-inch subs.

Factors to be considered:
Speaker weight (53 lbs)
Width of base (if using speaker stand alone)
Width & Weight of base (if using single 18" subwoofer as base with satellite pole)

Thanks in advance for all the input.

Dick Rees:
Links to any gear to be considered would be helpful.  Saves time....

Daniel Postilnik:
Rather than calculating for every potential piece of gear i might use, im looking to see if there's a formula or set of guidelines i can use. As in, if theres no wind or people bumping around, whats a workable ratio of base width to top width or base weight to top weight. Thanks.

Art Welter:
Daniel Postilnik wrote on Sat, 08 January 2011 18:35
Rather than calculating for every potential piece of gear i might use, im looking to see if there's a formula or set of guidelines i can use. As in, if theres no wind or people bumping around, whats a workable ratio of base width to top width or base weight to top weight. Thanks.

The subject has been covered here:

http://srforums.prosoundweb.com/index.php/m/460063/0/

Mike Pyle:
I can't give you any weight/dimension ratios. I expect that the strength and rigidity of the stand materials and construction would be a large factor. I haven't seen anything built by On-Stage that I would be willing to put 100 lbs of weight on. I also would not care to put that much weight on any subwoofer poles or pole cups, although I know others do.

I use the K&M 24105 fork with a couple of 50 lb. cabinets sometimes. When I do it goes on top of a Global ST132 crankstand. The base diameter and weight of these stands is great enough that it is stable for my use. If they were being used outdoors or in an area accessible by the public, they would be sandbagged.

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