The TS-1D from RDL is intended to protect audio input and output circuits from the effects of transients induced on the audio lines. Single or multiple units are typically mounted to good earth ground at the location that audio lines enter or exit an equipment rack. This protects wiring inside the rack against the effects of induced electrostatic discharge (ESD), transients, and RF interference.
The TS-1D integrates classical inductance, capacitance and resistance (LCR) filter techniques with hi-speed, solid-state switching to suppress frequency (time) related interference signals. These are configured to form a "brick wall" to signals above 1MHz (250 ns rise time).
A transient voltage above the nominal operating level of 40V peak will cause the circuit switch to close, shunting the transient current to ground, while the transient power is dissipated harmlessly by high-voltage resistors. The switching time is about 450 pSec.
The TS-1D contains four independent circuits. It may be used to protect four single-ended (unbalanced) lines or two balanced lines.