I-AMP GPT 60-IV User Manual page 11

at the risk of overdriving the telecoil pick-ups in some hearing aids, producing distortion in the received
signal.
Many installations can be designed to achieve signal to noise ratios of greater than 45dB. Mains wiring is
not often a problem over large areas of the induction loop pick-up area since wiring usually constricts the
supply and return wires in close proximity to each other, thus limiting the radiated field. However local areas
of high noise can be generated due to the splitting of active and neutral in some wiring configurations.
Low spill over systems are required in some theatres and conference rooms. Induction loop systems may be
used in these applications with careful design. Complex multi loop systems can be designed which cancel
the magnetic field outside the loop areas. These systems are more complicated than the single loop. The
GPT PS1, signal splitter drives the loops with different levels and phase relationships providing attenuation
rates far better than the single loop arrangement. The design of these systems is beyond the scope of this
document.
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