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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Crane and Rolling ScaffoldPosted by Paul S on: 7/27/2010
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Yes, that's exactly the "cable forklift" I was referring to.  You really don't want to go 24' with one, but that is not a concern for you.  The lifting cable is scary thin, and the thing is a wild ride at its load limit!  Unless they've changed the design recently, lowering a load is also scary. You'll definitely want to avoid moving the thing around when the load is raised!  FYI, two guys can lift and carry one of these things into the house, if you choose this route.

I think you referred to having access for a crane via a skylight, and this might work, depending on access on your property for the crane and the subsequent angle of attack and overall length required of the boom.  The longer the boom, the bigger the crane's body, so there will be a "sweet spot" at some point.  Big cranes are pretty expensive, and there are generally minimum "move-on" and "move-off" fees to add to the quoted hourly rate.  Much cheaper than a "crane" is a "boom truck", if this proves to be feasable.  1,500 lbs is no big deal for many of these rigs, which would enable you to work over tarps in the house, under the crane's access portal, when you coat the horns.  From there, you could raise the horns onto a rolling scaffold to wheel them to the opening.

The crane or boom truck alternative will certainly cost more, but it will also likely prove a good deal less "thrilling", if you know what I mean.

Don't forget to consider the floor under the listening room when you put 3,000 lbs. in there.  You may want to use temporary shoring in the basement until you get the horns in place.  I ass-u-me that the "post" the structural engineer suggested you put under the 2X 2X10 "beam" will continue below, in the basement, to Terra Firma, even if you are simply landing this "post" on an existing bearing wall.

Best regards,
Paul S

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