verification . please help improve this article by adding citations to reliable sources . unsourced material may be challenged and removed . november 2015 learn how and when to remove this template message dbx dbx professional products type pro audio manufacturer industry audio founded 1971 headquarters sandy utah united states key people david e. blackmer founder products dbx noise reduction systems compressors eqs active crossovers loudspeaker management systems parent harman international website dbxpro.com dbx inc. is an american producer of professional audio recording equipment . it was founded by david e. blackmer in 1971 . 1 the original company goal was to get closer to the realism of a live performance . its early products were based on the concept of using decibel expansion which gave the company its name . 2 dbx is best known for the dbx noise reduction system . 3 the dbx noise reduction system used compression while recording an audio track and symmetric expansion when playing it back . they also manufactured the model 700 a unique but short lived studio recording system briefly popular in some circles as a mastering format . another early product was the expanded range decibel meter a little solid state meter that measured audio voltages both weaker and stronger than other bigger contemporary voltmeters built into an aluminum extrusion that was about the size of the meter itself which was an earlier source of the company initials . original dbx logo . contents 1 the dbx voltage controlled amplifier 2 dbx compressors 3 acquisition history of dbx 4 references 5 external links the dbx voltage controlled amplifier edit the most important inventions of david blackmer and dbx are the dbx voltage controlled amplifier or vca and the dbx rms detector . the original dbx 202 vca was based on the blackmer gain cell and was referred to as the dbx 202 black can vca . they were built using discrete transistors that were hand matched while running at an elevated temperature in an oven . while noisy and having significant distortion they exceeded by far the performance of other vcas of the time . 4 these vcas were used in most early automated mixing boards . 5 dbx compressors edit in 1976 dbx introduced the dbx 160 compressor . using dbx s decilinear vca and rms level detection circuits and feed forward gain reduction this compressor allowed much smoother gain reduction . the feed forward gain reduction allowed infinite compression without excessive distortion or oscillation . it also allow the compressor to track the attack and release times of compression based on the signal s envelope . 6 the dbx compressor also introduced overeasy compression which introduced a soft knee when compression first starts . 7 8 a pro noise reduction card was the dbx k9 designed to fit into the pro dolby a a361 frames which were already in wide use in pro studios of the time to reduce noise in reel to reel tape recordings . one feature of the dbx system was an inbuilt noise gate to just shut off anything below a certain decibel level . acquisition history of dbx edit dbx manufactured only signal processing equipment until bought by bsr in 1979 . from 1979 until 1989 the brand name was also used for consumer audio equipment such as speakers cd players and amplifiers . in 1989 sanju chiba of elpj acquired the dbx division of bsr . the professional products division of dbx was sold off as a separate business to akg which in turn was bought by harman international . the oem business was sold to that corporation founded by members of dbx s engineering group . 4 dbx once held key patents for mts the u.s. standard for stereo analog television transmission but in 1994 it sold those patents to that corporation . in the present they sell professional digital signal processors equalizers compressors crossovers subharmonic synthesizers and many similar products . references edit hoffman f. 2004 encyclopedia of recorded sound volume 1 revised ed . taylor & francis 1 archived december 25 2010 at the wayback machine . dbx history . audioinvest.no . 2005 04 05 . retrieved 2015 11 25 . a b a brief history of vcas . thatcorp.com . retrieved 2015 11 25 . dbx founder david blackmer dies . stereophile.com . 2002 03 31 . retrieved 2015 11 25 . dbx model 160 161 compressors limters instruction manual pdf . mixonline.com . retrieved 2015 11 25 . 160a dbx professional audio . dbxpro.com . retrieved 2015 11 25 . 2 dead link external links edit dbx inc. home page v t e harman international industries subsidiaries akg acoustics c1000 amx crown international dbx professional products digitech digitech whammy harman kardon infinity systems jbl jbl paragon lexicon mark levinson audio systems martin professional soundcraft studer symphony teleca people david e. blackmer graham blyth phil dudderidge sidney harman james bullough lansing francis f. lee mark levinson retrieved from https en.wikipedia.org w index.php title dbx company & oldid 736324291 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