Tannoy VLS 7 - 4 Selection of Operating Mode

VLS Series Operation Manual rev 1.1.0
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4. Selection of operating mode
4. Selection of operating mode
AllVLSSeriesmodelscanbeoperatedaseitheralow-impedanceloudspeakerorwithina70/100Vdistributed
system.Theoperationmodeisselectableviaasingleswitchlocatedontherearofthecabinet.

Low-impedancemodeisrecommendedifthecablerunsarerelativelyshortandthenumberofspeakersis
small.If,ontheotherhand,thecablerunsarelongandmorethanafewloudspeakersarerequired,thena
distributedlinesystemisideal.
Whenoperatinginlow-impedancemode,theloudspeakerisabletodeliverawiderfrequencyanddynamic
range.However,ifthecablerunsareexcessivelylong,thenthesoundqualitymaybecompromiseddueto
theincreaseincableresistanceandtheresultingpowerlosses.Tokeeptheloadtotheampliermanageable,
itisalsorecommendedthatasmallnumberofspeakersbeused,thusavoidingcomplexseries/parallel
combinations.
Whenalargenumberofspeakersareinstalledoverlongcableruns,itisrecommendedthatadistributed
(70/100V)systembeused.Fordistributedline,thecableneednothaveaslargeacrosssectionalareaas
forlow-impedance,resultinginsavingsincablecost.Allspeakersareplacedinparallelwiththeoutputofthe
amplier,allowingeasyinstallation.Thewattagetappingscanbeindividuallyadjusted,givingmoreexibility
withinaninstallation.