150X Type I Noise Reduction(discontinued)

The 150X effectively doubles the dynamic range (up to a total of 115dB) of typical wide bandwidth media such as digital systems sampled at greater than 40kHz and analog tape recorders operating at 15ips or faster. Type I is the dbx® noise reduction typically found in music recording studio equipment packages.

The 150X provides two channels each of encode and decode electronics in a single package, with front panel bypass switches for each circuit. Front panel calibration trims allow readjustment to custom studio levels without mistracking.

Although simple in theory, the classic 2:1:2 compander noise reduction used in the 150X could not be practically achieved before the development by dbx of two patented circuits, the dbx RMS detector and dbx Voltage Controlled Amplifier (VCA). The RMS detector enables optimum decode tracking and transient response despite the phase shifts typically induced by tape recorders. The dbx VCA provides precise gain control over an extremely wide dynamic range while maintaining very low noise and distortion.