Large Area Assistive Listening Systems: Review and Recommendations

2.1.2.3 New York State Standards

Ambient electro-magnetic fields should not exceed 30 mA/meter; higher levels would preclude the installation of an IL in the particular location. In the event that adjacent areas were to be looped, magnetic field "spill-over" should not exceed 15 mA/meter. Given a 1000 Hz signal at a level equal to the long-time average level of speech, the average value of the magnetic field should be 100 mA/meter +/- 3 dB between 100 to 8000 Hz, with a maximum no greater than 400 mA/meter. This same signal should produce no more than 5% harmonic distortion and provide a signal to noise (ambient magnetic field) of at least 30 dB.