Alto Professional ZMX244FXUSB User manual

QUICKSTART GUIDE
ENGLISH ( 2 – 6 )
MANUAL DE INICIO RÁPIDO
ESPAÑOL ( 7 – 11 )
GUIDE D’UTILISATION RAPIDE
FRANÇAIS ( 12 – 16 )
GUIDA RAPIDA
ITALIANO ( 17 – 21 )
SCHNELLSTART-ANLEITUNG
DEUTSCH ( 22 – 26 )
SNELSTARTGIDS
NEDERLANDS ( 27 – 31 )

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BOX CONTENTS
yZEPHYR mixer
yPower cable
yUSB cable
yQuickstart Guide
ySafety Instructions & Warranty Information booklet
CONNECTION DIAGRAM
Power
Booth monitors*
Keyboard*
Computer*
Microphones* Headphones*
External effects rack,
compressor, etc.*
* Items not mentioned in BOX CONTENT
S
(including cables) are not include
d
Lamp*
House amp and
speakers*
Stage monitors*
External effects rack,
compressor, etc.*
TOP PANEL
REAR PANEL

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REAR PANEL FEATURES
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1. POWER IN – Use the included power adapter to connect the mixer to a power outlet. While the power is switched off,
plug the power supply into the mixer first, then plug the power supply into a power outlet.
2. POWER SWITCH – Turns the mixer on and off. Turn on the mixer after all input devices have been connected and
before you turn on amplifiers. Turn off amplifiers before you turn off the mixer.
3. PHANTOM POWER – Activates/deactivates phantom power. When activated, phantom power supplies +48V to the
XLR mic inputs. Please note that most dynamic microphones do not require phantom power, while most condenser
microphones do. Consult your microphone’s documentation to find out whether it needs phantom power.
4. MAIN MIX OUTPUTS – Use standard 1/4" cables to connect these outputs to the house speaker or amplifier system.
The level of these outputs is controlled by the MAIN MIX FADER.
5. MAIN OUTPUT LEVEL – Use this button to match the appropriate input level of a device connected to the MAIN MIX
OUTPUTS. When the button is depressed, the main mix will be reduced by 30 dB. When the button is raised, the main
mix will be boosted by 4 dB.
6. MAIN INSERT – Use standard 1/4" TRS cables to connect these jacks to external processors (such as compressors,
limiters, external EQ units, etc.). The audio sent out of these jacks is taken after the EQ. The audio is returned to these
jacks before the MAIN MIX FADER.
7. MONO OUTPUT VOLUME – Controls the level of the MONO OUTPUT.
8. MONO OUTPUT – This output is a summed mono version of the audio sent out of the MAIN MIX OUTPUTS. Use a
standard 1/4" TS cable to connect this jack to an external device (such as a monitor, recording device, etc.).
9. CTRL OUTS – Use standard 1/4" cables to connect these outputs to your monitor or amplifier system. The level of
these outputs is controlled by the CTRL ROOM VOLUME knob.
10. DFX OUT – This output sends out audio from the mixer's effects processor. Use a standard 1/4" TS cable to connect
this jack to an external device (such as a monitor, recording device, etc.). Adjust the level of the audio with the
EFFECTS OUT knob.
11. FOOTSWITCH – When a latching-style footswitch is connected to this jack with a 1/4" TRS cable, it can be used to
mute/unmute the mixer's effects processor.
12. USB PORT – Use a standard USB cable to connect the mixer to a computer. This port can send or receive different
kinds of audio over the USB connection, depending on the position of the USB RECORD and USB PLAYBACK
switches.
13. USB RECORD – When a computer is connected to the mixer's USB PORT, you can send audio from the mixer to the
computer for recording. Set this switch to "SUB1/2" to record the audio sent out of SUBGROUPS OUT 1 and 2. Set it to
"MAIN MIX" to send the main mix to the computer.
14. USB PLAYBACK – When a computer is connected to the mixer's USB PORT, you can send audio from the computer to
the mixer. Set this switch to "CH23/24" to send it to Channels 23/24. (Make sure the INPUT SELECTOR for Channel
23/24 is set to "USB.") Set the switch to "MAIN MIX" to send it directly to the main mix.
15. AUX SEND ** – Use 1/4" TRS cables to connect these outputs to the inputs of an external amplifier or active monitor.
You can adjust these levels with the AUX SENDS VOLUME knobs to create a custom monitor mix for onstage
musicians.
16. AUX RTN (RETURN) ** – Connect the outputs of an external device to these inputs with 1/4" mono cables. This is
usually used for outboard effects devices but can also be used like an extra input channel for synthesizers, drum
machines, etc. If your source is mono, plug it into the left jack and it will be heard on both the left and right sides.
17. DIRECT OUT – Use standard 1/4" TS cables to connect any of these outputs to an external device for recording,
monitoring, etc. each individual channel.
18. SUBGROUPS OUT – Use standard 1/4" TS cables to connect any of these outputs to an external device for recording,
monitoring, etc. each individual subgroup.
19. SUBGROUPS INSERT – Use standard 1/4" TRS cables to connect these jacks to external processors such as
compressors, limiters, external EQ units, etc. The audio sent out of these jacks will be the subgroup stereo signal. The
audio is returned to these jacks before the subgroups faders.

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TOP PANEL FEATURES
Note: The channels have essentially the same controls with some minor variations between Channels 1-16, 17-20, and 21-24.
The three different channel types are shown here.
1. MIC INPUT – Connect a microphone to these inputs with an XLR
cable.
2. LINE INPUT – Connect line-level devices to these inputs with 1/4"
cables.
3. INSERT – Use a standard 1/4" TRS cable to connect an external
processor (such as a compressor, limiter, external EQ unit, etc.) to
this jack. The signal will be taken after the channel's gain control
and returned before the channel's EQ controls.
4. GAIN – Adjusts the channel audio level (pre-fader and pre-EQ
gain). Adjust this so that the PEAK LED just barely lights up during
the loudest parts of the song.
5. LOW CUT FILTER – When this button is depressed, that channel's
audio will be sent through a 75 Hz low-frequency filter with a slope
of 18 dB per octave. This is useful for reducing hum and other low-
frequency noise when using microphones.
6. HI EQ (TREBLE) – Adjusts the high (treble) frequencies of the
channel.
7. MID EQ – Adjusts the mid-range frequencies of the channel.
8. MID FREQUENCY SELECTOR – Adjusts the frequency band
affected by the MID EQ knob.
9. MID-LOW – Adjusts the 500 Hz frequency band.
10. LOW EQ (BASS) – Adjusts the low (bass) frequencies of the
channel.
11. AUX SEND CHANNEL VOLUME – Adjusts the audio level sent
from that channel to the Aux Channel (which is sent out the AUX
SENDS and controlled by the AUX SENDS VOLUME knobs). The
top two knobs can adjust the pre- or post-fader levels (as
determined by the AUX PRE-/POST-FADER SWITCH). The bottom
knob can adjust the level of the signal sent to the mixer's effects
processor.
12. AUX PRE-/POST-FADER SWITCH – When the button is
depressed, the audio sent to the corresponding AUX SENDS is
taken before the channel's fader. When the button is raised, the
audio sent to the AUX SENDS is taken after the channel's fader.
13. CHANNEL PAN / BALANCE – If this knob is labeled "PAN," it
adjusts the (mono) channel's position in the stereo field. If the knob
is labeled "BAL," it adjusts the balance between the two mono
channels of that stereo signal.
14. PEAK LED – The LED will flash if the signal is clipping. If this
happens, decrease the setting of the GAIN knob or CHANNEL
FADER.
15. CHANNEL FADER – Adjusts the audio level on the channel.
16. CHANNEL MUTE – Press this button to mute/unmute the channel.
The channel's audio will only be sent to its INSERT or heard in the
Solo Channel when its SOLO button is depressed.
17. CHANNEL ASSIGNMENT – Use these buttons to send the channel
to a subgroup, multiple subgroups, and/or the main mix. Subgroup
levels are controlled by the SUBGROUP VOLUME FADERS; the
main mix level is controlled by the MAIN MIX FADER.
18. SOLO – When this button is depressed, the audio will be heard in
the Solo Channel, which will become the only audio sent to the
PHONES OUTPUT and CTRL OUTS. The LED METERS will also
display the audio levels, which are controlled by the PHONES and
CTRL ROOM volume knobs.
19. INPUT SELECTOR – On Channel 23/24, this button is used to
select whether the channel's audio input source is its LINE INPUTS
or the mixer's USB PORT (which will receive audio from a
connected computer). When the button is depressed, the USB PORT is selected; when it is raised, the LINE INPUTS
are selected.
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20. 2-TRACK INPUTS – You may connect these inputs to the
outputs of an external sound source using a standard stereo
RCA cable (sold separately). You can send this channel to
the Solo Channel (using the CTRL ROOM SOURCE "2 TK
IN" switch) and/or the main mix (using the 2TK TO MIX
switch).
21. 2-TRACK OUTPUTS – Connect these outputs to the inputs
of an external recording device using a standard stereo RCA
cable (sold separately).
22. LAMP – Connect a gooseneck lamp (12 V, 0.5 A, not
included) to this BNC connector.
23. PHONES OUTPUT – Connect 1/4" stereo headphones to
these outputs. The PHONES VOLUME knob controls the
volume.
24. EFFECTS OUT VOLUME – Adjusts the volume of the audio
sent out of the DFX OUT from the mixer's effects processor.
25. AUX 1/2 – Adjusts the level of the audio sent from the
effects processor out AUX SENDS 1 and 2.
26. EFFECTS SELECTOR – Selects the effect that the mixer's
internal effects processor will apply to the various channels.
Each channel can send different levels of audio to the
processor by adjusting their FX POST SEND knobs. See the
EFFECTS section for an explanation of the available effects.
27. VARIATIONS SELECTOR – Selects the amount of the
effect applied to the various channels.
28. FX MUTE – Press this button to mute/unmute the effects.
29. FX PEAK LED – The LED will flash if the signal is clipping.
If this happens, decrease the setting of the EFFECTS OUT
knob. When the effects processor is muted, the LED will be
solidly lit.
30. POWER LED – Illuminates when the mixer is on.
31. PHANTOM POWER LED – Illuminates when the PHANTOM
POWER switch is on.
32. EQ ON/OFF – Enables or disables the GRAPHIC
EQUALIZER.
33. GRAPHIC EQUALIZER – When the EQ ON/OFF switch is
on (depressed), you can use these controls to adjust the
equalization of the main mix.
34. AUX SENDS VOLUME – Controls the audio level sent out
the AUX SENDS.
35. AUX SENDS SOLO – When this button is depressed, the
audio signal being sent to the AUX SENDS will also be
routed to the Solo Channel, which will become the only
audio sent to the PHONES OUTPUTS and CTRL OUTS.
The LED METERS will also display the audio levels, which are controlled by the PHONES and CTRL ROOM volume
knobs.
36. AUX RTN VOLUME – Controls the audio level sent into the AUX RTN inputs.
37. AUX RTN TO AUX SEND VOLUME – Controls the audio level sent from the AUX RTN inputs back into the Aux
Channel.
38. AUX RTN 3 ROUTING SWITCH – Selects whether the AUX RTN 3 audio is routed to the CTRL ROOM mix (when the
button is depressed) or the main mix (when the button is raised).
39. AUX RTN 4 ROUTING SWITCHES – When these buttons are depressed, the AUX RTN 4 audio will be routed to
Subgroup 1 and 2, Subgroup 3 and 4, and/or the main mix.
40. AUX RTN SOLO – When this button is depressed, all AUX RTN audio will be heard in the Solo Channel, which will
become the only audio sent to the PHONES OUTPUTS and CTRL OUTS. The LED METERS will also display the audio
levels, which are controlled by the PHONES and CTRL ROOM volume knobs.
41. SUBGROUPS ASSIGN TO MAIN – Use these buttons to assign each subgroup's left and right channels to the main
mix. When a button is pressed, that channel is being routed to the main mix.
42. SUBGROUPS VOLUME – Use these faders to adjust the volume levels of each subgroup. The subgroups' audio will be
sent out their respective SUBGROUPS OUTS. When a subgroup has any of its ASSIGN TO MAIN buttons depressed,
its audio will also be sent to the main mix.
43. MAIN MIX FADER – Adjusts the volume of the MAIN MIX OUTPUTS.
44. SOLO MODE – Selects whether the Solo Channel is pre-fader ("PFL," when the button is raised) or post-fader ("AFL,"
when the button is depressed).
45. LED METERS – Shows the audio level of the main mix or the Solo Channel (when a channel's SOLO button is
depressed). The CLIP LED can light up occasionally, but if it happens too often, reduce the volume of the mix and/or
individual channels.
46. CONTROL ROOM SOURCE – Use these buttons to assign which channels are sent to the CTRL OUTS – the main mix,
Subgroups 1 and 2, Subgroups 3 and 4, and/or the 2 TRACK IN signal.
47. 2TK TO MIX – When this button is depressed, the 2 TRACK OUT audio will be added to the main mix.
48. PHONES VOLUME – Adjusts the volume of PHONES outputs.
49. CTRL ROOM VOLUME – Adjusts the volume of the CTRL OUTS.
PFL ACTIVE
AFL ACTIVE
(DFX TO AUX 1 RTNS)
(DFX TO AUX 2 RTNS)
(TO AUX SEND 1/2)
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EFFECTS
TO HEAR THE EFFECTS ON A CHANNEL: Use the EFFECTS SELECTOR to choose one of the effects below, adjust the
parameter with the VARIATIONS SELECTOR, then turn up the AUX SEND CHANNEL VOLUME 4 for that channel.
# PRESET DESCRIPTION PARAMETER RANGE
1 VOCAL 1 Reverb, simulating a room with a small delay time. Decay time
Pre-delay
0.8~1.1s
0~79ms
2 VOCAL 2
Reverb, simulating a small space with a slight decay
time.
Decay time
Pre-delay
0.8~2.5s
0~79ms
3 LARGE HALL Reverb, simulating a large acoustic space. Decay time
Pre-delay 3.6~5.4s
23~55ms
4 SMALL HALL Reverb, simulating the acoustics of a stage space. Decay time
Pre-delay 1.0~2.9s 20~45ms
5 LARGE ROOM Reverb, simulating a studio with many early reflections. Decay time
Pre-delay 2.9~4.5s 23~55ms
6 SMALL ROOM Reverb, simulating a bright studio room. Decay time
Pre-delay
0.7~2.1s
20~45ms
7 PLATE Simulates bright plate reverb. Decay time
Pre-delay 0.6~6.1s 10ms
8 TAPE REVERB
Simulates classic tape delay created by multiple
playback heads. Decay time Pre-delay 1.3~5.4 0~84ms
9 SPRING REVERB
Simulates the lightly stretched sound of spring reverb
from analog transducers. Decay time Pre-delay 1.3~5.4s
0~84ms
10 MONO DELAY Reproduces the signal after a small period of time. Delay period 60~650ms
11 STEREO DELAY
Reproduces the signal after a small period of time with a
slight difference between the two stereo channels. Delay period Feedback 210~400ms 37~73%
12 FLANGER
Classic stereo flanging effect, similar to a jet plane
taking off. Rate 0.16~2.79Hz
13 CHORUS
Simulates the full, complex, watery sound of several
instruments playing the same thing. Rate 0.5~5Hz
14 REVERB+DELAY Delay effect with room reverb. Delay period
Reverse decay time
211~375ms
1.0~2.9s
15 REVERB+FLANGER Stereo flanger effect with room reverb. Flanger rate
Reverse decay time 0.16~2.52Hz
16 REVERB+CHORUS Stereo chorus effect with room reverb. Chorus rate
Reverse decay time 0.5~4.74Hz 1.5~2.9s

TECHNICAL SPECIFICATIONS
MONO INPUT CHANNELS:
Microphone inputs (electronically balanced, discrete input configuration)
Frequency response: 20 Hz – 20 kHz, ±1 dB
THD+N: 0.03% at 0 dBu, 1 kHz
Gain range: 0 dB to 50 dB (MIC)
SNR: 114 dB
Line inputs (electronically balanced)
Frequency response: 20 Hz – 20 kHz, ±1 dB
THD+N: 0.03% at 0 dBu, 1 kHz
Gain range: -15 to 35 dB
STEREO INPUT CHANNELS:
Line inputs (balanced/unbalanced)
Frequency response: 20 Hz – 20 kHz, ±1 dB
THD+N: 0.03% at 0 dBu, 1 kHz
IMPEDANCES:
Microphone inputs: 1.4 kΩ
Channel insert return: 2.5 kΩ
All other inputs: > 10 kΩ
2-Track outputs: 1 kΩ
All other outputs: 120 Ω
EQUALIZATION:
High-shelving: ±15 dB @ 12 kHz
Mid bell (mono): ±12 dB (frequency range 100 Hz ~ 8 kHz)
Hi-Mid (stereo): ±15 dB @ 3 kHz
Mid-low (stereo): ±15 dB @ 500 Hz
Low-shelving: ±15 dB @ 80 Hz
Low-cut filter: 75 Hz, 18 dB/Oct.
DSP SECTION:
A/D & D/A converters: 24-bit
DSP Resolution: 24-bit
Effects: Reverbs: Hall, Room, Vocal, Plate
Delays: Mono, Stereo (max delay time: 650 ms)
Modulations: Chorus, Flanger, Reverb
Combinations: Reverb + Delay, Reverb + Chorus, Reverb + Flanger
Presets: 16 presets, 16 variations each
Controls: 16-position preset selector, 16-position variation selector, DSP mute switch,
peak LED indicator
MAIN MIX:
Noise (bus noise): Fader 0 dB, channels muted: -90 dBr (ref: +4 dBu)
Fader 0 dB, all input channels assigned & set to unity gain: -88 dBr (ref: +4 dBu)
Max output: +22 dBu balanced XLR
+22 dBu unbalanced 1/4"
Aux returns gain range: -∞to +15 dB
Aux sends, max out: +22 dBu
POWER SUPPLY:
Main voltage:USA/Canada: 100-120 VAC ~ 60 Hz
UK/Australia: 240 VAC ~ 50 Hz
Europe: 210-240 VAC ~ 50 Hz
Power consumption: 70 W
Fuse: T1.6 AL
Main connection: Standard IEC receptacle
DIMENSIONS (W x D x H): 30.1" x 15.7" x 4.5" (765 mm x 400 mm x 115 mm)
WEIGHT: