Sirus MXA 4500 User manual

User’s manual
Sirus Pro
MXA 4500

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Table of content
1. Safety instructions........................................................................................................................... 3
2. Control Elements ............................................................................................................................ 5
2.1. Microphone channels............................................................................................................. 5
2.2. Stereo channels..................................................................................................................... 5
2.3. Main Out section.................................................................................................................... 7
2.4. Headphone section................................................................................................................ 7
2.5. 3S Sorround function ............................................................................................................. 8
2.6. Effects loop ............................................................................................................................ 8
2.7. Crossfader section................................................................................................................. 8
2.8. AUTO BPM Counter............................................................................................................... 9
2.9. Connections ........................................................................................................................... 9
3. Installation..................................................................................................................................... 12
3.1. Audio connections................................................................................................................ 12
4. Specifications................................................................................................................................13
Importeur: .............................................................................................................................................. 14

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1. Safety instructions
FOR SAFE AND EFFICIENT OPERATION
Be careful with heat and extreme temperatureAvoid exposing it
to direct rays of the sun or near a heating appliance.
Not put it in a temperature bellow 41°F /5°C, or exceeding 95°F /35°C.
Keep away from humidity, water and dust
Do not place the set in a location with high humidity or lots of dust.
Containers with water should not be placed on the set.
Keep away from sources of hum and noise
Such as transformer motor, tuner, TV set and amplifier.
To avoid placing on un-stable location
Select a level and stable location to avoid vibration.
Do not use chemicals or volatile liquids for cleaning
Use a clean dry cloth to wipe off the dust, or a wet soft cloth for stubborn dirt.
If out of work, contact sales agency immediately
Any troubles arose, remove the power plug soon, and contact with an engineer for repairing,
do not open the cabinet by yourself, it might result a
danger of electric shock.
Take care with the power cable
Never pull the power cable to remove the plug from the receptacle, be sure
to hold the plug. When not using the player for an extended period of time
be sure to disconnect the plug from the receptacle.
CAUTION: To reduce the risk of electric shock, do not remove the top cover (or the rear section).
No user serviceable parts inside; refer servicing to qualified personnel.
WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain and
moisture.

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(1) Read these instructions.
(2) Keep these instructions.
(4) Follow all instructions.
(5) Do not use this device near water.
(6) Clean only with a dry cloth.
(7) Do not block any ventilation openings. Install in accordance with the manufacturer s instructions.
(8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
(9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider than the other. A grounding type plug has two blades and a
third grounding prong. The wide blade or the third prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete
outlet
(10) Protect the power cord from being walked on or pinched particularly at plugs, extension
cords, and the point at which they exit the unit.
(11) Only use attachments/accessories specified by the manufacturer.
(12) Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or
sold with the device. When a cart is used, use caution when moving the cart/ device
combination to avoid injury from stumbling over it.
(13) Unplug this device during lightning storms or when not used for long periods of time.
(14) Refer all servicing to qualified service personnel. Servicing is required when the unit has
been damaged in any way, such as power supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the device, the unit has been exposed to rain or
moisture, does not operate normally, or has been dropped.

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2. Control Elements
2.1. Microphone channels
(1) These are the balanced XLR connectors for dynamic microphones.
(2) Using the 3-band microphone equalizer ( and ), you can change the sound
of your voice and optimally adjust it (+/-15 dB).
HIGH,MID LOW
(3) The control adjusts the volume of the MIC AUX send signal laid out at the rear panel MIC
AUX SEND connector (see (38) )
AUX
(4) Use the VOL control to adjust the microphone signal volume.
Your PRO MIXER features a talk over function. It works very simply: as soon as you talk into
your mike while a track is playing, the track s volume is lowered.When talking to the audience, this
function is useful because it makes your voice come through over the music.
＇
(5) Use the TALK key to activate the talk over function (its LED is lit).
(6) The control changes the sensitivity of the talk over function. The lower it is set, the louder
does the mike signal need to be in order to suppress the music signal.
SENS
(7) Use the DPT control to determine the extent to which the music signal is lowered.
(8) Use the switch to activate the microphone channel. If its LED is lit, the channel is
active.
2.2. Stereo channels
(9) Select the input signal for the stereo channels using the key. Phono is intended
for connecting a turntable. Line and CD have to be selected for all other signal sources
(e. g. CD or MD players). Unlike the first three channels, channels 4 and 5 each feature
two line inputs. On the rear panel, a special feature lets you change the input sensitivity
of the phono inputs of channels 1 through 3 to line level, so that you get more flexibility
(see 36 ).
Never connect equipment with line level signals to the highly sensitive phono inputs! The
output signal level of turntables is on the order of magnitude of milivolts, while CD players
and tape decks have signal levels measuring in volts. Simply put, line signals are up to
100 times stronger than those intended for phono inputs. If you re using phono inputs that

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can be switched into line level (see 36 ) always make sure that the PHONO/LINE switch is in
its correct position (switch pressed!).
(10)The control is used to set the level of the input signal. The display 13 reads off the
current signal level.
(11) Every input channel features a 3-band equalizer (HIGH, MID and LOW) with kill characteristic.
This way, a signal can be lowered (-32 dB ) much more than it can be increased
(+12 dB). For example, this function is useful when you need to suppress a particular frequency
range in a music track.
•The overall signal level is also dependent on the EQ settings. You should first
adjust the EQ before adjusting the signal level.
(12) By using the EQ BYPASS key, you can deactivate the 3-band equalizer. This way, you
can easily compare the processed and the unprocessed signals with one another; or, you
can alternate between extreme EQ settings and the raw signal, creating cool effects.
(13) You can read off the level of input signals (post EQ) using the 4-digit LEVEL meter.

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(14) Determine the channel volume using the 60-MM CHANNEL fader.
(15) Pressing the PFL key routes the respective input so that it can be monitored on the headphones
(corresponding LED is lit ). You can also dial up several channels and listen to them simultaneously
(see also chapter 2.4 HEADPHONE section ).
2.3. Main Out section
(16) The VOL 1 control is used to adjust the output volume on the MAIN 1 output (see 41 ).
(17) The VOL 2 control is used to adjust the output volume on the MAIN 2 output (see 46 ).
(18) To adjust balance on the MAIN 1 output, use the BAL 1 control.
(19) You can read off the MAIN 1 audio signal volume level on the LEVEL METER.
(20) The POWER switch powers the PRO MIXER on. You should always make sure that the
POWER switch is in the Off position when initially connecting the unit to the mains.
•Please take note: Merely switching the unit off does not mean that it is fully
disconnected from the mains. When not using the unit for prolonged periods of time,
please unplug the unit s power cord from the power outlet.
•Always turn the power amps on last to avoid inrush currents that can easily damage
your speakers. And, to avoid sudden and unpleasant surprises for your ears, make sure
there is no signal at the PRO MIXER before turning on the power amps. To be sure,
slide all the faders to the bottom and switch all controls to the zero position.
2.4. Headphone section
The PFL signal is your headphone signal used to monitor music without influencing the MAIN
signal (PFL = Pre Fader Listening).
(21) This is the unbalanced PHONES connector for your headphones. Your headphones
should have a minimum impedance of 32 Ohms. For example, the headphones are
ideally suited for this purpose.
(22) If the MODE switch is in the SPLIT position, the PFL signal is on the left, and the
MAIN signal is on the right. The MIX control (see 23 ) has no function in this case.
While in STEREO mode, you can alternate between MAIN and PFL signals using the
MIX control.

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(23) When in STEREO mode, use the MIX control to determine which signal is heard on
the headphones. When MIX is in its left-most position (PFL), you can only hear the headphone
signal selected previously using the PFL keys of the input channels (see (15)).
When MIX is in its rightmost position (MAIN), you can only hear the MAIN audio signal.
Placing the MIX control somewhere in between those two extreme positions determines the
volume ratio of the two signais. If the MODE switch is in its SPLIT position (see (22)),
the (PFL) MIX control has no function.
(24) The VOL control determines the volume of the headphone signal.
2.5. 3S Sorround function
The 3D surround function is a built-in effect that gives your music a nice finishing touch, making
every performance truly memorable. By widening the stereo base, the sound comes through more
alive and transparent. Using the ON switch 25 activates the 3D surround function (corresponding
LED is lit) and the control 26 determines the intensity of the effect.
2.6. Effects loop
(27) Using the RET control, you determine the volume of the effects signal that can be brought
in at the RETURN input on the rear (see (49)). To get the effects signal, you need to connect
the inputs of an effects unit to the SEND outputs (see (48) ) of your VMX1000. The outputs
of the effects unit are then connected to the RETURN inputs of your mixer.
2.7. Crossfader section
(28) The VCA CONTROLLED CROSSFADER is used to cross fade between the selected channels
(see 30 ). The crossfader used in the mixer is a professional 45-mm fader.
(29) Use the CF CURVE control to modify the control character of the crossfader between linear
and logarythmic in an infinite number of steps. When in linear characteristic mode, the crossfader
fades equally in each segment of its movement range; in the logarythmic characteristic mode,
volume control is concentrated to the outer segment of the fader s range of motion.
(30) Use the ASSIGN A and ASSIGN B rotary switches to determine which input signals are
routed to the A and B sides of the CROSSFADER.With ASSIGN A, channels 1 through 4
can be selected; with ASSIGN B, channels 2 through 5. Then, you can alternate between
these two channels using the CROSSFADER (see(28) ).

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2.8. AUTO BPM Counter
The integrated auto BPM counter is an extremely useful feature. It ensures smooth transition from
one track to the next. It can calculate the tempos of various tracks in BPM (beats per minute). Both
BPM counter sections are identical and both show the BPM value of the two stereo channels routed to
the crossfader.
The tempo of the track assigned by using the ASSIGN AorASSIGN B keys is shown in the respective
DISPLAY (31). Several tempo changes in one track would produce a constant display of various
BPM values and thus lead to unnecessary confusion. That s why each beat counter section has a
SYNCLOCK button 32 that can be used during the song to limit the range of possible tempo values.
This makes sense if the counter has already calculated a realistic value. You can do the same
manually with the BEATASSIST button (33). Push this button at least three times in sync with the song
s tempo, and the tempo you tapped appears in the DISPLAY. The BEAT ASSIST and SYNC LOCK
buttons are each equipped with a LED.
To exit SYNC LOCK or BEAT ASSIST mode, simply press the SYNC LOCK key in both channels
once again.
When no signal is present (or when the signal level is too low), the BPM display shows only
dashes. When the signal is present but can not be identified, the display shows 160 BPM and
then shows the dashes. The beat counter then attempts to get another readout. Therefore.
160 BPM is no usable value; rather, it is simply an error message when the signal can not
be analyzed.
2.9. Connections
(34)These are the LINE and CD inputs respectively, used for connecting tape decks, CD or MD
players etc. Unlike other channels, channels 4 and 5 feature two line inputs.
(35)The PHONO inputs for channels 1 through 3 are intended for connecting turntables. Channels
1 through 3 can be switched over to line level (see (36)).
(36)Using the PHONO/ LINE switches, you can change the input sensitivity of the PHONO inputs
on channels 1 through to line level (switch pressed). This way, you can even connect a tape
deck or a CD player to the PHONO inputs.
IMPORTANT : Always pay attention to the correct position of the PHONO/LINE switch when
connecting a line level signal to a phono input. The switch must be in its pressed
position (LINE)! Otherwise,overdriving may lead to permanent damage
to the phono input.

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(37) The GND connectors are used for grounding turntables.
(38) The MIC AUX signal, adjustable using the AUX controls on the microphone channels (see (3)),
is laid out at this SEND jack connector. For example, the input of an external reverb can be
connected here.
(39) An external stereo effects signal can be fed back into the mixer using the RETURN L/R jack
connectors. If you connect a mono effects signal, you need to use the left RETURN L connector.
The effect volume can only be adjusted on the output control of the effects unit.
(40) The balanced MAIN 1 XLR outputs are used for connecting a power amplifier. Use the VOL
1 control to adjust the volume (see (16)).
(41) Hitting the MONO key changes the stereo MAIN 1 output signal into a mono signal. Doing this
makes sense when you for example use your PRO MIXER in large rooms where the speakers
are placed far from each other. A stereo signal would have a disrupting effect, since the
speakers each transmit a somewhat different signal. If you press MONO, an identical signal is
transmitted to both MAIN 1 outputs. The BAL 1 control (see (18)) has no function here.
(42) You can connect an additional amplifier to the SUBWOOFER output in order to drive a passive
subwoofer. If you wish to use an active subwoofer, connect it directly to this output. Either
way, you get more bass power out of your music.
(43) Use the LEVEL control to adjust the volume of the SUBWOOFER output signal
(44) Use the X/O control to adjust the upper cut-off frequency of the SUBWOOFER signal (adjustable
between 30 and 200 Hz). All frequencies with values below the cut-off frequency will
be reproduced.
(45) The MAIN 2 output allows you to connect an amplifier to drive monitor speakers or to provide
sound in another room/area ( zone ). The VOL 2 control (see (17)) adjusts the MAIN OUT
section.
(46) Using the TAPE output, you can record your music by connecting equipment such as tape
decks, DAT recorders etc. Unlike the MAIN outputs, the output volume is fixed, making it necessary
for you to adjust the input level on the recording device.
(47) Your PRO MIXER features an effects loop that can be used for an external effects unit or a
sampler. The signal is taken at the PFL section through the SEND connector and fed into
your external equipment. The signal laid out at the SEND connector is therefore identical to
the headphone signal. Connect this output to the input of your effects unit.