Rerurn to Romy the Cat's Site
In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Knocking and Raising the HornPosted by Paul S on: 7/27/2010
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You might want to try covering a section of plywood with the modified cement/mortar recipe as a test before you write it off as too difficult or too expensive. Basically, it does pretty much what you ask, and it need not be 2" thick, either; 1/2" or so should do the job, maybe less.
A good rental yard should have at least one type of hand-cranked, cable-drive "forklift" on small wheels that allow you to roll it into a room and into position. I have lifted gigantic ridge beams into position at scary heights with these things. I dunno about 1,500 lbs., however... Mostly, commercial electricians and (fire) "sprinkler" fitters use these things.
But, no matter. Just don't get bogged down thinking you have to raise the horns in one grand pass. In reality, you only need to be able to move the horns up a little bit at a time while you raise the "cribbing" under them; raise, set cribbing, etc., etc.
Simple hydraulic jacks or even screw jacks can be used in small-ish increments to raise immense loads. I have raised whole houses 3' this way. Don't fight it, but massage it. Use plenty of everything and it will be safe and fast enough. Once you're up there, combine blocks, levers and "come-alongs" to push/pull the horns off the cribbing and into the attic space.
Best regards,
Paul SRerurn to Romy the Cat's Site