Tech Notes

The power supply cord used on most modern electronic equipment has a three pin plug. This article will explain why the separate ground pin is used and why shock hazards will result if the ground system is defeated. The power distribution system used in the United States is 120 volts "alternating current" at 60 cycles. For many years this standard AC (mains) system was a two prong plug and socket combination wired with one side "hot" (usually the black wire at 120 volts) and the other side neutral (usually the white wire at 0 volts or ground). However, in the early days there were no true standards. Often there was no color code and sometimes no hot or neutral wires (in this case, both wires were hot). Unfortunately, this two wire system is still found in many older buildings throughout the country.

Before attempting to suspend this speaker, consult with a certified structural engineer. Speaker can fall from improper suspension, resulting in serious injury, death, and property damage. Do not suspend or mount any other product or device from this enclosure! Use only the correct mating hardware. All associated rigging is the responsibility of others. Whenever possible, in addition to the nominal primary mounting method, use a suitable safety chain or wire rope attached to one of the other groups of fly point inserts, and firmly attached to a suitable structural member as indicated by a certified structural engineer. We recommend the use of Thread-locker at the insert point bolts, so the bolts cannot vibrate loose.