DBX150 Noise Reduction
Description : 12 Jul, 2023
Noise reduction for the stereo mastering machine is often one of the neglected areas for the cost-conscious studio, and yet it can be a most significant factor in determining the quality of the final 'product'. When you consider that the ¼\" stereo master tape will be the original source of all subsequent copies, it is not difficult to see why the noise performance at this stage is so important.
It is essential that a noise reduction system used for stereo mastering should be one of the standard, professional formats in order to patible with the units installed in cutting rooms, duplicating plants and other studios; in practical terms this means that you are limited to a choice between Dolby A or dbx Type I. The Dolby A system is the most widely used for mastering, being reputed to be the system most free from unwanted side effects. However, it is not entirely without problems; Dolby A provides only 10dB of noise reduction (between 30Hz and 5kHz, rising to 15dB at 15kHz) and the system needs to be critically aligned for optimum performance, necessitating the recording of reference tones ('DolbyTone'), but above all, two modern Dolby A units, even second-hand these days, can be prohibitively expensive for the home studio.
The dbx system, developed in the early 1970s, is perhaps slightly less sophisticated than the Dolby process, but in its own way it is still a very elegant solution to the problem of tape noise. It is an accepted professional format which has a number of qualities to mend it, and in the dbx 150, offers probably the most cost-effective stereo noise reduction unit currently available.
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