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[Jerry Turnbow]

I'm involved with an installation where a particular domestic manufacturer's speakers are to be hung in a gymnasium.  The manufacturer furnishes a 2mm wire rope, a carabiner, and self-locking holder, etc. as well as a safety cable for redundancy, to support this 21 lb speaker.

My concern/question, is that the manufacturer's installation document shows, as the recommended installation method, looping the 2mm wire rope directly around a metal beam.

Most of my flying experience has been with portable, live audio, where we never ever wrap a wire rope around a metal beam, without some padding - burlap, etc. to prevent metal-to-metal contact, sharp pressure points on the wire rope, etc., or else suspend with approved hardware (shackles, forged eyebolts, etc.)

I know that we're talking about a 21 lb speaker here, and my research shows a typical 1/16" 7x7 rated wire rope, which is smaller than the 2mm in diameter, is rated for 480 lb, but hanging a thin metal rope on a rough-edged beam 30' in the air over grade schooler's heads just doesn't seem right.

Am I being overly paranoid or concerned about this?

[g'bye, Dick Rees]

I'm involved with an installation where a particular domestic manufacturer's speakers are to be hung in a gymnasium.  The manufacturer furnishes a 2mm wire rope, a carabiner, and self-locking holder, etc. as well as a safety cable for redundancy, to support this 21 lb speaker.

My concern/question, is that the manufacturer's installation document shows, as the recommended installation method, looping the 2mm wire rope directly around a metal beam.

Most of my flying experience has been with portable, live audio, where we never ever wrap a wire rope around a metal beam, without some padding - burlap, etc. to prevent metal-to-metal contact, sharp pressure points on the wire rope, etc., or else suspend with approved hardware (shackles, forged eyebolts, etc.)

I know that we're talking about a 21 lb speaker here, and my research shows a typical 1/16" 7x7 rated wire rope, which is smaller than the 2mm in diameter, is rated for 480 lb, but hanging a thin metal rope on a rough-edged beam 30' in the air over grade schooler's heads just doesn't seem right.

Am I being overly paranoid or concerned about this?

Definitely not!!!

[duane massey]

We used to use beam clamps with eyebolts for these speakers. Extra $5-7 per hang, but I certainly felt better about it. Safety would sometimes be looped over the beam, but a lot of installers (not our company) didn't use the safety.

[Joseph D. Macry]

It sounds like you're talking SoundTube or similar design.
I have hung several of these in gyms directly around steel beam members. The ones I hung came with a second steel cable to be installed more loosely as a backup.

If this gym is for organized (sanctioned) competition, they may have rules about keeping so many feet of clear space above the game court. School districts in my area require 25 feet clear for competition.

[ProSoundWeb Community]