User`s manual

ProgramLimiterand“D‐Max”Limiter

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TheDSO480 unitshavetwolevelsofdynamicprotectiononitsoutputs–atraditionalprogramlimiter,anda

newlyintroduced“D‐Max”limiter.

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Program Limiter

Highperformancedigitallimitersareprovidedforeachoutputwithcontroloverattacktime,releasetimeand

thresholdparameters‐seepage29fordetails.Thislevelofcontrolallowstheusertobalancetherequired

subjectivequalityofthelimiteragainstthedriverprotectionrequirements.Itdoesalsomeanthatan

incorrectlysetlimitermaysoundawful!Inparti

cular,aswithalllimiters,usingtoofastanattackorrelease

timewillresultinexcessivelowfrequencydistortion.IntheDesign a Crossoversub‐menuthereis

anoptionforautomaticlimitertimeconstants.Usethisoptionifyouareunsurehowtosettheti

me

constantsmanually.PROELrecommendtheuseoftheautomaticsetting.

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InthismodethetimeconstantswillbeautomaticallysetfromtheHigh‐Passfilterfrequencyaccordingtothe

tablebelow.

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Thetimeconstantsaresetbythehighpassfilterfrequencyforthatchannel.

HighPassFilter AutoAttackTime ReleaseTime

<10Hz–31Hz 45mS x16(720mS)

31Hz–63Hz 16mS x16(256mS)

63Hz–125Hz 8mS x16(128mS)

125Hz–250Hz 4mS x16(64mS)

250Hz–500Hz 2mS x16(32mS)

500Hz‐1kHz 1mS x16(16mS)

1kHz–2kHz 0.5mS x16(8mS)

2kHz–32kHz 0.3mS x16(4mS)

“D-Max” Clip Limiter

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Themainlimitationwithtr aditionaldynamicscontrolistheinability oftheprocessingtoreacttruly 

instantaneouslytothesignal.Oneofthemostsignificantadvantagesofdigitalsignalprocessingover

analogueistheabilitytodelaytheaudiosignalpreciselyandwithoutextensivecomplexhardware.Theentire

domainofdigitalsignalpr

ocessingisbasedaroundthecombinationofdelaying,multiplying,andaccumulating

numbers(representingsamplesofaudio)toimplementallthefiltersanddynamicsprocessingwehavecome

toexpecttoday.

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Inthecaseofdynamicsprocessing,beingabletodelayasignalallowstheprocessormoduletodelaythemain

signalinrelationtothesidechain(thesignalbe

ingmonitoredrelativetothethreshold),sothatitcan

compensateforpeakspriortothearrivalofthemainsignal.

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