When selected, the NR MODE B is a variable shelving equalization circuit
that also controls the "Ax Sidechain" signal. The associated red, yellow, and
green LED's correspond directly to a -, 0, or + change in a variable high pass
shelving circuit when you set the NR THRESHOLD Control. The yellow (0)
LED indicates no shelving equalization, while the red (-) and green (+)
LED's signify a shelving cut or boost of the high frequencies, respectively.
Fig. 4-4 shows the action of NR MODE B (variable shelving equalization)
for three different MIX Control settings (refer to Section 4.8) at different
levels below a given THRESHOLD setting. Notice that a maximum MIX
Control setting produces the greatest shelving drop as sidechain signal falls
below a set threshold. When NR MODE B is active, the Model 250 will actu
ally "erase" audio (broadband) noise while, at the same time, restore bright
ness and intelligibility to a seriously noisy audio track or source.
Front Panel Controls
4-3
4.1.2 NR MODE B
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