User`s manual

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Notethat,forsafety,alwayssetthelimiterthreshold1or2dBbelowthemaximumallowableworkedout

usingtheabovemethod.

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ALWAYSREFERTOYOURSPEAKERMANUFACTURERFORLIMITERSETTINGS.

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CrossoverFilterSlopes

Itshouldalsobenotedthattheturnoverfrequencydisplayedonthescreenisthe‐3dBpointforalltypes

exceptLinkwitz‐Rileywherethe‐6dBpointisshown.Ifthe‐6dBpointistobeusedfortheBesselor

Butterworthfilter,taketherequiredcrossoverfrequency,multi

plythisbytheappropriatefactorfromthe

followingtableandthenselecttheclosestavailablefrequencyonthedisplay.

Filter Type High pass factors Low pass factors

Bessel 12 dB/Oct. 1.45 0.69

Butterworth 12 dB/Oct. 1.31 0.76

Bessel 18 dB/Oct. 1.37 0.73

Butterworth 18 dB/Oct. 1.19 0.84

Bessel 24 dB/Oct. 1.35 0.74

Butterworth 24 dB/Oct. 1.15 0.87

Bessel 48 dB/Oct. 1.39 0.72

Butterworth 48 dB/Oct. 1.08 0.93

Pleasenotethatunlikeconventionalanaloguecrossovers,crossoverpointsandslopesaresetwithabsolute

accuracysincecomponenttoleranceproblemsdonotoccur.

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Pleaseseepage18fordetailsofhowtoadjustthehighandlowpasscrossoverfiltersettings.

TimeAlignment

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AfurtheradvantageoftheDSO480 overconventionalproductsistheprovisionofanindependentlyadjustable

delaysectionforeachoutput.Thisallowsthetruearrivaltimefrommultipledriverstopreciselyalignedrather

thanrelyingonthecompromise'phaseadjust'approach.Delaytimeisadjustablein0.3µSsteps(0.1m

m).

Pleaseseepage17fordetailsofhowtoadjustthedelaytimes.

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Toconvertfromunitsoftime(i.e.milliseconds)tounitsofdistanceusethefollowingformula:

1millisecond=343mm(1.126ft)@20°C(68°F) 

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Tocalculatetimedelayforaknowndistance,use:

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Timedelay= Distanceinmet

ers

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20.06x√273+°C

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where°Cisthetemperaturein°C.

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Tosimplifythisequationat20°C.

Delaytimeinmilliseconds =

(Distanceinmetersx2.192)or(Distanceinfeetx 0.955)

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Note:Centigrade=(Fahrenheit–32)x0.5555.