APart MA247MR Руководство по эксплуатации онлайн [3/24] 758464

INFO@APART-AUDIO.COM

Features

•TheMA247setsanewstandardasaprofessional6zonePAmixingamplifier/preamplifierforcommer-

cial and industrial applications, either as a standalone unit or as the central device in an expandable,

simplebutcleverpagingsystem.Theamplifierisequippedwith4balancedmic/lineinputs,eachwith

adjustablegainandtonecontrols,upto4linelevelinputsandanemergencyinput.

•TheMA247hasasixlevelprioritysystem.Theemergency/telephoneinputhasthehighestpriorityand

is activated by a switch or vox circuitry. Its signal goes directly to the main amplifier, bypassing any level

control accessible at the front of the unit. An attenuator next to the input sets its level. Micro¬phone

input1hasthesecondprioritylevel,followedbythemic2,3and4andfinallythelinesignals(music).

•Zones2to6canbevolumecontrolledindividually.Pleasenotethatzonesnumber5and6are70volt

outputs,thesearecompatiblewith100voltspeakers,butbynature,theseoutputswillhaveaslightly

reducedoutputlevel,meantforthe‘quiet’zonesinamultizonesystem.Forevenmoreflexibility,zone1

isanindependentzonewithaseparatelineleveloutput,whichturnstheMA247intoatrue2zonemix-

ing amplifier with integrated preamplifier. During paging, the corresponding integrated volume control

willbeautomaticallybypassed.Whenpriorityhasbeenactivatedinanyzone,theinternal24VDCsup-

plyoutput(max0.6A)canactivatepriorityrelaysofloudspeakerattenuatorsorotherdevices.Thereis

adedicated24Voutputperzone!Evenanemergency24VDCsupplyinputispresentontheunit.The

supply will automatically keep the amplifier powered when mains power is interrupted. Mic input 1 is

optimizedtobeusedwithourMICPAT-6,aselectivepagingstation6zonemicrophone.

Thismicisthemastermic.Maximum5ofthesemicscanbeswitchedinparallelonthissingleinput!

Micinput2-4aredesignedtobeusedwithourMICPAT-2(2zonegroups)microphoneoranyother

microphonedependingontheapplication.OntheMA247unityoucanpreset2paginggroupstobe

pagedwithmic2–4.PleasenotethatitisnotpossibletoconnectmultipleMICPAT-2mics

to the same input.

•That’snotall.Ifyouareaprofessionalinstaller,youwillappreciatethepossibilitytouseanexternal

amplifieraspagingamplifier.Why?Supposezones2and3shouldnotreceivepagingmessages,

meaning there should always be background music. Then you can use an external amplifier for all

pagingtasks.MA247doesalltheswitchingandthinkingforyou.Theinternalamplifierwillbeused

forbackgroundmusic.Whenapagingmessageissenttootherzonesthanzone2and3,zone2and

3willstayconnectedtotheinternalamplifierandwillcontinuetoplaythemusic.Allotherzoneswill

hearthepagingmessage:theMA247willdisconnectthesezonesfromtheinternalamplifierandwill

send the paging signal to the external amplifier. The external amplifier will feed the signal to the selected

zonesviatheMA247.Whenpagingisfinished,thezoneswillautomaticallybeswitchedbacktothe

internal amplifier. We will show an example of such application in this manual. We will use a 2 channel

PA2240BPamplifierandaMA247inanapplicationthatwouldnormallyuseatleasttwiceasmuch

units to do all the switching and signal routing.

•Auniquenewswitchingcircuitdesignhasbeenappliedtoensuretrouble-freeswitchingformanyyears.

•Removable19”bracketsaredeliveredasastandardaccessoryalongwithyouramplifier.

•TheMA247complieswiththeCEstandards.