User Manual
21
the“CH_INPUT”signal.
Shouldthisinputbeusedforvocalannouncements,youarerecommendedtousethededicatedBM100Acalling
basesettoactivatethecleancontact.
BM100APRE‐AMPLIFIEDANNOUNCEMENTMICROPHONEBASECONNECTION
ConnecttheBM100Aterminaltothepriorityinputterminalboard(Fig.2,Ref.3)accordingto
thediagram
reportedunderthebase:
Theblue“BUSY”cableisonlyusedtoswitchonthebusyLEDwhenmorethanoneBM100Abaseisconnectedin
par allelonthesameinput;connectthebluecablesofthevariousbasestoeachotherandnotto
theamplifier.
4. PRIVOL
Gaincontrolofinput“PRIORITYINCH_”.
Operatethispotentiometertoincreaseordecreasetheaudiosignallevelontherelative“PRIORITYINCH_”(Fig.
2,Ref .3).
5. Operatingmodeselector(4Ω/70V /100V)
Eachchannelisequippedwithitsownoutputoperatingmodeselector.
Note:eachchannelcanbesetinanentirelyindependentwayfromtheothers.
Turntheselectorto:
4Ω: Channelsetto4Ωoperation(ConstantImpedance).
Thecorre spondinggreenLedonthefrontpanel(Fig.1,Ref.4)lightsup.
In this operatingstatus, connect a suitable power supply
load to the output terminal (Fig. 2,
Ref.8)havingminimumelectricalimpedanceofnotlessthan4Ω
100V: Channelsetforoperationat100V(ConstantVoltage).
Thecorre spondingredLedonthefrontpanel(Fig.1,Ref .4)lightsup.
Inthisoperating status,connectan adequatelypoweredloadof
100Vto theoutputterminal
(Fig.2,Ref .8)
70V: Channelsetforoperationat70V(ConstantVoltage).
Thecorre spondingredLedonthefrontpanel(Fig.1,Ref .4)lightsup.
In this operating status, connect an adequately powered load of 70V to the output terminal
(Fig.2,Ref .
8)
6. MONO/DUAL
CH1&CH2SELECTORonDUAL: ChannelsCH1andCH2operateindependently.
ThesignalsonchannelCH1inputswillonlybepresentontheCH1amplified
output(Fig.2,Ref.8).SimilarlyforCH2.
Eachchannelwillrespondtoitsownpitchcontrols(Fig.1,Ref .3)andMaster
volume((Fig.1,
Ref.2).
CH1&CH2SELECTORonMONO: Inthisstatus,both“CH1”and“CH2”outputs(Fig.2,Ref .8)willhavethesame
amplified audio signal from the total of “CH1 INPUT” and “CH2 INPUT”, the
priority inputs “PRIORITY IN CH1” and “PRIORITY IN CH2”, however, they will
onlyoperateand
bepre sentontheirrespectivechannels.
Each channel will respond to its own pitch controls(Fig. 1, Ref.3) and Master