Operation Manual

8. Software Installation
18
VSXNET Subwoofer Operation Manual rev 2.0.0
Audio Processing
VNET provides the following processing options:
Crossoverlteringwithfrequencyvariableovertherange10Hzto25kHz(andOut)withthe
followingalignments:
• 1storder
• 12dB/OctaveBessel
• 12dB/OctaveButterworth
• 12dB/OctaveLinkwitz-Riley
• 18dB/OctaveBessel
• 18dB/OctaveButterworth
• 24dB/OctaveBessel
• 24dB/OctaveButterworth
• 24dB/OctaveLinkwitz-Riley
TheLowbandhasalow-passcrossoverlter,andtheHighbandhasahigh-passandalow-pass
crossoverlter.
• A2ndorderlow-shelflterwithfrequencyvariableovertherange10Hzto25kHz,andboost/cut
 from-15to+15dB.
• A2ndorderhigh-shelflterwithfrequencyvariableovertherange10Hzto25kHz,andboost/cut
 from-15to+15dB.
• Eightbandsofbell(parametric)equaliser,eachbandhavingfrequencyvariableovertherange
 10Hzto25kHz,bandwidthvariablefrom0.1to5octaves,andboost/cutfrom—15to+15dB.
• Delayadjustableupto200ms.
• Adjustablegainfrom—30to+15dB,andmute.
Equalisation Filters
TheeightBelllters(Parametricequalisationlters)mayeachbeusedtoemphasise(byapplyingapositiveLevelparameter
setting)orde-emphasising(byapplyinganegativeLevelparametersetting)arangeoffrequenciescentredonthesettingofthe
Frequencyparameter,andencompassingafrequencyrangedeterminedbytheBandwidthparametersetting.
Thetwoshelvingltersallowallfrequenciesbelowthatofthefrequencyparameter(fortheLowshelf)orallfrequenciesabove
thatofthefrequencyparameter(forthehighshelf)tobeemphasised(byapplyingapositiveLevelparametersetting)orde-
emphasised(byapplyinganegativeLevelparametersetting).
Crossover Shapes
InadditiontotheusualButterworth,Linkwitz-RileyandBesselltershapes,VNETprocessingprovidesaccesstoHardman
crossoverltering.Hardmanltersproducemuchsteepercut-offslopesforagivenorderthanconventionalcrossover
alignments,withoutanyadditionalgroupdelay.Thisallowsalowerorderltertobeusedwithoutsacricingcut-off
characteristics,butwithsmoothergroupdelayandlessseverephasepenalties,givingamorenaturalsound.Hardmanlters
andalsoprovideidenticalphasecharacteristicsbetweenadjacentbands(likeLinkwitz-Riley),sothepolarperformanceis
rocksteady.

WealsoemployphasematchingonourBessellters,soadjacentbandsarein-phasethroughoutthecrossoverregion.