The filter cut-off frequency display has nine LED segments and the expander gain reduction has a five segment LED display. Further to this there are LED's to show bypass, stereo link status and power input. A 50Hz 'rumble' filter with a slope of 18dB per octave is available independently on both channels. In addition to a full system bypass, the expander and filter can be switched out of the audio path separately, enabling easy comparisons to be made. A comprehensive expander with automatic attack time, variable release and switchable ratio and attenuation gives up to 40dB reduction in overall noise during silent passages.
Stereo linking allows both channels to track identically.
This prevents image shifting with stereo programme, and phase shifts when both channels are mixed into mono. The dynamic filter has two modes of operation. In the manual mode, the threshold is adjusted by the user to give optimum results. In the Auto mode the unit is capable of tracking the signal level thereby enabling the filter to continue to operate successfully during fade ups and downs. This makes manual adjustment unnecessary.