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End-of-Line Speaker Load Module for Supervision
IEDM596EOL Front Top Down
The Model 596EOL End-of-Line Module is a device which augments automatic testing of 70 Volt and 100 Volt constant voltage speaker lines. The 596EOL allows testing continuty of speaker wiring all the way to the end of the line without the need and expense of a return wire from the line end. When used with the 20 kHz test of the IED Monitor/Test system, the 596EOL enables testing the integrity of the speaker lines of any balanced audio amplifier in the range of 100 W to 400 W.

While the 596EOL represents a significant load to the amplifier and speaker lines at 20 kHz, it has no significant effect on the audible frequency performance of the system. For proper/complete speaker line testing, speakers on a circuit must be wired as one continuous string without any paralleled off branches. Figure shows the right and wrong ways to interconnect speakers for proper testing.

Only one 596EOL can be applied to the end of the speaker line of any one amplifier output. It is not permissible to place additional units in branch circuits of the same amplifier output. The 596EOL is designed to comply with the requirements of NFPA 72 (2002 Edition) and UL864 (2003 Edition).