Audio Press Box APB-416 C User manual

APB-416 C
Press Conference Audio Distribution Amplifier
Owner’s manual
English

Always follow the basic precautions listed below to avoid the possibility of serious injury or even death from electrical shock, short-circuiting, damages,
re or other hazards. These precautions include, but are not limited to, the following:
Always follow the basic precautions listed below to avoid the possibility of physical injury to you or others, or damage to the device or other property.
These precautions include, but are not limited to, the following:
Power supply/Power cord
• Onlyusethevoltagespeciedascorrectforthedevice.Therequiredvoltageisprinted
onthenameplateofthedevice.
• UseonlythespeciedACpoweradaptor.
• Donotplacethepowercordnearheatsourcessuchasheatersorradiators,anddonot
excessivelybendorotherwisedamagethecord,placeheavyobjectsonit,orplaceitina
positionwhereanyonecouldwalkon,tripover,orrollanythingoverit.
Do not open
• Donotopenthedeviceorattempttodisassembletheinternalpartsormodifytheminany
way.Thedevicecontainsnouser-serviceableparts.Ifitshouldappeartobemalfunctioning,
discontinueuseimmediatelyandhaveitinspectedbyqualiedAudioPressBoxservice
personnel.
Power supply/Power cord
• Removetheelectricplugfromtheoutletwhenthedeviceisnottobeusedforextended
periodsoftime,orduringelectricalstorms.
• Whenremovingtheelectricplugfromthedeviceoranoutlet,alwaysholdtheplugitself
andnotthecord.Pullingbythecordcandamageit.
• Toavoidgeneratingunwantednoise,makesurethereis50cmormorebetweentheAC
poweradaptorandthedevice.
• DonotcoverorwraptheACpoweradaptorwithaclothorblanket.
WARNING
CAUTION
Water warning
• Donotexposethedevicetorain,useitnearwaterorindamporwetconditions,orplace
containersonitcontainingliquidswhichmightspillintoanyopenings.
• Neverinsertorremoveanelectricplugwithwethands.
If you notice any abnormality
• Ifthepowercordorplugbecomesfrayedordamaged,orifthereisasuddenlossof
soundduringuseofthedevice,orifanyunusualsmellsorsmokeshouldappeartobe
causedbyit,immediatelyturn off the power switch, disconnect the electric plug from
theoutlet,andhavethedeviceinspectedbyqualiedAudioPressBoxservicepersonnel.
• IfthisdeviceortheACpoweradaptorshouldbedroppedordamaged,immediatelyturn
offthepowerswitch,disconnecttheelectricplugfromtheoutlet,andhavethedevice
inspectedbyqualiedAudioPressBoxservicepersonnel.
Location
• Beforemovingthedevice,removeallconnectedcables.
• When setting up the device, make sure that the AC outlet you are using is easily
accessible.Ifsometroubleormalfunctionoccurs,immediatelyturnoffthepowerswitch
anddisconnecttheplugfromtheoutlet.
• Avoidsettingallcontrolstotheirmaximum.Dependingontheconditionoftheconnected
devices,doingsomaycausefeedbackandmaydamagethespeakers.
2

Use only the adaptor included with this
AudioPressBox. Use of a different adaptor may
result in equipment damage, overheating, or re.
Be sure to unplug the adaptor from the outlet
when not using AudioPressBox, or when there
are lightning storms in the area.
To avoid generating unwanted noise, make
sure there is 50 cm or more between the
power adaptor and AudioPressBox.
• Donotexposethedevicetoexcessivedustorvibrations,orextremecoldorheat(such
asindirectsunlight,nearaheater,orinacarduringtheday)topreventthepossibilityof
paneldisgurationordamagetotheinternalcomponents.
• Donotplacethedeviceinanunstablepositionwhereitmightaccidentallyfallover.
Connections
• Beforeconnectingthedevicetootherdevices,turnoffthepowerforalldevices.Before
turningthepoweronoroffforalldevices,setallvolumelevelstominimum.
Handling caution
• WhenturningontheACpowerinyouraudiosystem,alwaysturnonthepoweramplier
LAST,toavoidspeakerdamage.Whenturningthepoweroff,thepowerampliershould
beturnedoffFIRSTforthesamereason.
CAUTION
• Donotinsertyourngersorhandsinanygapsoropeningsonthedevice.
• Avoidinsertingordroppingforeignobjects(paper,plastic,metal,etc.)intoanygapsor
openingsonthedeviceIfthishappens,turnoffthepowerimmediatelyandunplugthe
powercordfromtheACoutlet.ThenhavethedeviceinspectedbyqualiedAudioPressBox
servicepersonnel.
• Donotusethedeviceorheadphonesforalongperiodoftimeatahighoruncomfortable
volumelevel,sincethiscancausepermanenthearingloss.Ifyouexperienceanyhearing
lossorringingintheears,consultaphysician.
• Donotrestyourweightonthedeviceorplaceheavyobjectsonit,andavoiduseexcessive
forceonthebuttons,switchesorconnectors.
XLR-typeconnectorsarewiredasfollows(IEC60268standard):pin1:ground,pin2:hot(+),andpin3:cold(-).
AudioPressBoxcannotbeheldresponsiblefordamagecausedbyimproperuseormodicationstothedevice,ordatathatislostordestroyed.
Alwaysturnthepoweroffwhenthedeviceisnotinuse.
Theperformanceofcomponentswithmovingcontacts,suchasswitches,volumecontrols,andconnectors,deterioratesovertime.ConsultqualiedAudioPressBoxservicepersonnelabout
replacingdefectivecomponents.
Illustrationshereinareforexplanatorypurposesonly,andmaynotmatchactualappearanceduringoperation.
Companynamesandproductnameshereinaretrademarksorregisteredtrademarksoftheirrespectivecompanies.
Specicationsanddescriptionsinthisowner’smanualareforinformationpurposesonly.AudioPressBoxreservestherighttochangeormodifyproductsorspecicationsatanytimewithoutprior
notice.Sincespecications,equipmentoroptionsmaynotbethesameineverylocale,pleasecheckwithyourAudioPressBoxdealer.
3

Dearcustomer,
ThankyouforpurchasingtheAudioPressBox®APB-416 C.
AudioPressBox® APB-416 Cisaprofessionalportableactivepressbox(AudioSplitter)suitableforbothindoorandoutdoorpressconferences.
Itfeatures4MIC/LineInputs(A,A+B,B)and16Line/MicOutputs.EachOutputisindependettransformerbalancedandisolated.Whatismore,
itcanalsobeusedforbilingualconferencesasitfeatures2separatechannelsAandB.EachinputcanberoutedtochannelAorchannelBor
bothatthesametime.ThereisabusAwith8Line/MICoutputsandbusBwith8Line/MICoutputs.TheAPB-416 Calsoincludesarechargable
AccuPacksoitcanrunonitsownupto10hours.Allofthisplacedinawaterproof,heavydutyNanukcase.
+48V
If you are about to use condenser microphone, turn
PhantompowerswitchON tofeedyourmicrophone
with24/48V.Ifyouusedynamicmicrophoneormicro-
phonewithhisownpower,youcanswitchthisOFF.
AFL
For better check your levels, you can isolate output
fromeachgrouptoyourheadphones.Youcancheck
theoutputlevelsofeachgroupbyhearing.Justpush
the button and you will hear output from particular
group.
Routing switch
Eachmicrophonecouldberoutedto2separatedgroupsortobothgroupsatthesametime.Thisisuseful,ifyouhavetwo(orfour)lecterns
andyouwanttoroutesignalfromeachmicrophone(orgroupof2microphones)toseparatedtracks.Reporterscanedittherecordingeas-
ily,iftheyhavebothlecternsonseparatedtracks.Youcanlabeltheoutputsintheoutputextenderwithnamesofthelecternsorgroups
andreporterseasilydecidewhichgroupoutputtheywanttouse.
PAD
Ifyouareusingmicrophoneasaninput,thisbutton
shouldbesetto“Off”position.Ifyouareusinginput
fromthemixingconsoleorCDplayer,pleasesetthis
switchto“On”position.
PFL
To check your levels only for one input, push this
buttonandyoucanseethelevelofoutputforcorre-
spondinginput.Youcaneasilyseeifallmicrophones
havethegoodoutputlevelsandidentify,ifsomeofthe
microphonesaretooloudortoosilentintheoutput.
Features:
APB-416C
4
PAD
26dB
A/B
BUS
AFL PFL

The package contains
1. AudioPressBoxunit.
2. Powersupply.
3. Manual
4. Testreport
HPF (High Pass Filter)
Thisbuttonhelpstoavoiddistributinglow-endrumblelikeamicrophonehan-
dlingnoiseorpops.Youhave2options–fullrangeor160Hzlow-cutfrequen-
cy.Theoneyouchoosedependsonthesound,youwanttolterout.
OSC (Oscillator operation switch)
Totestsignallevel,whichiscomingtotheoutputs,youcanswitchthisTest
1kHzsinesignaloscillatoron.Afterrecipientssetthelevelsintheirrecording
devices,youshouldswitchthisfunctionOFF.Whencompressorswitchisset
toON,outputsignallevelwon’texceedthismaximumoutputlevel.
COMP (Compressor/Limiter operation button)
Toprovideperfectoutputsignalwithoutclippingordistortion,youcanswitch
theCompbuttonON. If you switch this OFF,signalinoutputcouldcontain
signalclippingordistortion.
Transformer
Individuallytransformerisolatedoutputs.
Rechargeable batteries
OptionalBuilt-inLi-Ionbatterypackwithmicroprocessorcontrolled
battery management, 10 hour working time at full load. No self-
dischargeandmemoryeffect,alwaysreadytouse.Shortcharging
timecomparedtoconventionalbatteries.
5
COMPHPF
TRANSFORMER
16 x
OSC
AC
+
LI-ION
ACCU
PACK
(10 HRS)

APB-416C
1) Input XLR microphone/line connector
Inputyourmicrophoneorline-levelsourceintothis
XLRbalancedconnector.Youcanconnectanytypeof
condensereitherdynamicmicrophonehere.
(1:Ground;2:Hot,3:Cold).
2) Phantom power indicator
IfthePhantompowerison,thisisindicatedwithsolid
redlight.
6
3) +48V button
If you are about to u se condenser microphone, turn
PhantompowerswitchONtofeedyourmicrophonewith
24/48V. If you use dynamic microphone or microphone
withhisownpower,youcanswitchthisOFF.
4) PAD button
Ifyouareusingmicrophoneasaninput,thisbutton
shouldbesetto“Off”position.Ifyouareusinginputfrom
themixingconsoleorCDplayer,pleasesetthisswitchto
“On”position.
8 9 10 7
25 12 13 16
PFL PFL PFL PFL A B
3 3 3 3
66666666
12 12 12 12
518 18 18 18
2Volume
PAD +48V HPF COMP PAD +48V HPF COMP PAD +48V HPF COMP PAD +48V HPF COMP
4AFL AFL
Phones
Out to Out to Out to Out to
3
+
A B
OFF
1 6 11 19 20 14 15
Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line
1 2 3 4 5 6 7 8 APB-416C
Charge Battery Power DC 24V/1A
100%
Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line Mic Line 50%
13 14 15 16 17 18 19 20
16 18 17 21
Signal GR[dB]
Clip
Signal GR[dB]
Clip
Signal GR[dB]
Clip
Signal GR[dB]
Clip
Output
- 12 -
- 6 -
- 0 -
- -6 -
- -12 -
- -24 -
- -48 -
0
-6
-30
0
-6
-30
0
-6
-30
0
-6
-30
Osc
ON
A
+
A B
B
A
B
A
A B
B
A
A B
B
Hold
5s
25%
Low
ON
OFF
Be sure to leave this switch off ( ) if you do not
CAUTION need phantom power.
When tuning the switch on ( ), be sure that only condenser
mics are connected to the XLR input. Devices other than
condenser mics may be damaged if connected to the phantom
power supply. Note, however, that the switch may be left on
when connecting to balanced dynamic microphones.
To avoid damage to speakers, be sure to turn off ampli ers (or
powered speakers) before turning this switch on or off. We also
recommend that you turn all output controls to their minimum
settings before operating the switch to avoid the risk of loud
noises that could cause hearing loss or device damage.

7
5) Input gain level knob
You can set the input signal level depending on the
connectedaudiosourcetoreachtheoptimaloutputlevel.
YoucanchecktheoutputlevelontheOutputlevelmeter
(5).IfDanteinputisselectedyoucanadjustthelevelof
Dantesignal.
6) High Pass Filter switch
You can turn ON the HPF to eliminate low frequency
disturbanceslikepopsormicrophonehandlingnoise.The
cut-offfrequencyoftheHPFis160Hz.Itisveryhandyfor
speech.Ifyouneedtodistributethemusicorfull-range
signalsitishandytohavetheHPFswitchedoff.
7) Compressor/Limiter switch
If you need to reduce the dynamics of the input signal
and/or be sure that the output signal will not be higher
than the nominal output level please switch this button
ON.Functionofthecompressorandlimiteryoucansee
ontheGainreductionlevelmeter(6).Itisvery goodfor
speech.
8) PFL button
Tocheckyourlevelsonlyforoneinput,pushthisbutton
and you can see the level of output for corresponding
input.Youcaneasilyseeifallmicrophoneshavethegood
outputlevelsandidentify,ifsomeofthemicrophonesare
tooloudortoosilentintheoutput.
9) Microphone level indicator bar
You can visually monitor the level of each microphone
outputsignalin5-segmentoutputindicatorbarwithsignal
clipLED.Ifthisredlightisashingyoushouldreducethe
gainofthemicrophone.
10) Gain Reduction indicator bar
IfCompswitchissettoON,youcanvisuallymonitorthe
levelofGainreductiononthis4-segmentindicatorbar.
11) Routing switch
Eachmicrophonecouldberoutedto2separatedgroups
ortobothgroupsatthesametime.Thisisuseful,ifyou
havetwo(orfour) lecternsand youwanttoroutesignal
from each microphone (or group of 2 microphones) to
separatedtracks.Reporterscanedittherecordingeasily,
iftheyhave both lecternsonseparatedtracks.Youcan
label the outputs in the output extender with names of
thelecternsorgroupsandreporterseasilydecidewhich
groupoutputtheywanttouse.
12) Test signal oscillator operation switch
Totestsignallevel,which iscomingtotheoutputs,you
can switch this Test 1,6 kHz sine signal oscillator on.
Afterrecipientssetthelevelsintheirrecordingdevices,
you should switch this function OFF. When compressor
switchissettoON,outputsignallevelwon’texceedthis
maximumoutputlevel.
13) Global group output level indicators
You can check output levels of each group individually
herein7-segmentlevelindicationbar.
14) AFL button
You can check output levels of each group individually
herein7-segmentlevelindicationbar.
15) Headphones output connector
If you want to monitor the output by your headphones,
youcanplugthemtothisconnector(6.3TRS/Jackstereo
connector).
16) Headphones output level knob
Ifyouhaveyourheadphonespluggedin,youcanadjust
thelevelofmonitoringtheoutputbyturningthisknobto
set your comfort hearing level. Please be careful when
setting the levels, too high monitoring volumes can
damageyourhearingability!
17) Power ON indicator
WhenAudioPressBox®isturnedon,thisindicatorlightsup.
18) Power switch
Withthepowerswitch,youcanturnyourAudioPressBox®
ONorOFF.
19) Group A Mic/Line Outputs 1-24 + Group B Mic/
Line Outputs 1-24
MicleveloutputXLRconnectors–everyoutputis
individuallytransformerisolated.
20) Mic/Line level select switch
YoucansetifyouwanttogetMic(-20dBu)orLine(+6dBu)
levelfromindividualoutput
21) Power supply connector
PlugthemainscabletoAudioPressBox®here.

Specications
8
Audio Press Box APB-416C
Type 4 in 16 out
Groups 2
Input section
Inputs 4
Input connectors Balanced, XLR
Input Gain MIC +22/+62 dB LINE -4/+36 dB
Max. input level Limiter ON
Mic: -10/-30dBu
Line: +36/-4dBu
Limiter OFF
Mic: -2/-42dBu
Line: +24/-16dBu
Input Impedance Mic: 2,4 kOhm Line: 3,5 kOhm
Phantom Voltage 48V
Output section
Outputs 16 Line/MIC level (8x Output A, 8x Output B)
Output connectors Balanced, XLR
Nominal Output Level +6dBu
Maximum Output Level +20dBu (no load)
+14dBu (600Ohm)
Output impedance MIC: 220 Ohm LINE: 600 Ohm
Transformer isolated outputs Yes (each output)
SNR 86dB
Frequency Response 30/160Hz (lter) to 30kHz/-1dB
Controls Input section: 26dB PAD, Input gain, Phantom, High-pass lter,
Compressor, PFL, routing switch
Output section: Oscillator, Output level for Bus A and Bus B, AFL for Bus A
and Bus B, Phones level, Power, Output PAD
Indicators Input section: Input clip, Phantom power, Input level, Gain
reduction, PFL
Output section: Output level for Bus A and Bus B, Oscilator, Power, Battery
status
Power Supply 24V DC, 300mA external adaptor
Battery Li-Ion, 14,4 V 2200mAh
Battery operation time min. 8 hrs
Weight 7 kg

Blockdiagram
9

e-mail: [e-mail] | web: www.audiopressbox.com
MediaTech Central Europe, a.s., Drienova 34, 821 02 Braslava, Slovak Republic (EU)
Tel: [phone]