Art Project Series Manuel utilisateur

USBMIX6

SIX CHANNEL MIXER WITH

USB INTERFACE AND DSP EFFECTS

Project Series

User’s Manual

IMPORTANT SAFETY INSTRUCTIONS - READ FIRST

This symbol, wherever it appears, This symbol, wherever it appears, alerts you

alerts you to the presence of uninsulated to important operating and maintenance

dangerous voltages inside the enclosure that instructions in the accompanying literature.

may be sufficient to constitute a risk of shock. Please read the manual.

Read instructions

Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the

equipment. Follow the operating instructions printed in this user guide.

Do not open

There are no user serviceable parts inside. Refer any service work to qualified technical personnel only.

Power sources

Only connect the unit to mains power of the type described in this user guide or marked on the rear panel. The

power source must provide a good ground connection.

Power supply

Use the external power supply for your local mains supply as provided with the equipment. If the provided

external supply does not fit into you outlet consult your service agent. Route the external power cord so that it

is not likely to be walked on, stretched or pinched by items placed upon or against.

Grounding

Do not defeat the grounding and polarization means of the power cord plug. Do not remove or tamper with the

ground connection on the power cord.

Moisture

To reduce the risk of fire or electrical shock, do not expose the unit to rain, moisture or use in damp or wet

conditions. Do not place container of liquid on it, which may spill into any openings

Heat

Do not locate the unit in a place close to excessive heat or direct sunlight, as this could be a fire hazard.

Locate the unit away from any equipment, which produces heat such as: power supplies, power amplifiers and

heaters.

Environment

Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink

spillage and smoke especially that associated with smoke machines.

Handling

Protect the controls from damage during transit. Use adequate padding if you need to ship the unit. To avoid

injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit.

Servicing

Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled liquid or

the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is noted. Refer

servicing to qualified technical personnel only.

Installation

Install the unit in accordance with the instruction printed in the user manual.

INTRODUCTION

The ART USBMIX6 Microphone, Instrument, and Line Mixer / Computer Interface is a compact versatile

audio interface for your computer that converts analog signals from a variety of audio sources to a

digital audio. The built-in low latency stereo digital effects add to the versatility. It can also be used as

a stand-alone mixer through the main mix outputs. The USBMIX6 provides a great starting point for

personal home studio recording or for anyone wanting to do mobile location recording. Use the

USBMIX6 to record pod casts, capture your latest idea for a song, make voiceovers for your home

movies, or record a jam with a friend - whenever and wherever your creativity takes you!

Features

Powered by a 5vdc external power supply, USB interface needed when used with a computer

CH1 and 2 Microphone (balanced XLR) inputs or instrument (unbalanced ¼-inch TS) inputs with

switchable impedances

Switchable low noise +48V phantom power for microphones

Balance ¼-inch TRS inputs for stereo or mono line-level sources on CH3-4

¼-inch TRS output jacks work with balanced or unbalanced lines

Unbalanced RCA inputs Ch5-6

Stereo ¼-inch TRS headphone jack with independent level control for output monitoring

Independent controls for both sets of inputs, main output, and headphone monitor

Red LED signal/clip indicator for Ch1-2, overall gain shown on LED meter display

Switchable assignment of USB playback to channels 5 and 6 or monitor

No special drivers needed with most modern versions of Windows, Mac OS, and Linux

USB cable, USB power adaptor and Audacity recording software included

Rugged steel case

INSTALLATION

This compact audio mixer with USB interface and DSP effect unit is suitable for universal applications,

e.g. for audio recording with a the computer. It has four input channels, i.e. 2 x mono, 2 x stereo, for

connecting microphones (also phantom-powered) and other audio sources with line signal level ( e.g.

musical instruments, players). In addition, there are connections for recording and headphones are

provided. The mixed stereo signal is sent via ¼-inch jacks and the USB jack. The USB jack can be

used at the same time as an input for transferring audio data from the computer to the mixer.

The power connection is made via the supplied AC power adapter.

Prior to powering up the unit, the output controls MONITOR PHONES and MAIN MIX should be turned

back to “0”.

1. As audio sources, microphones and/or audio sources with line signal level (e.g., effect units, musical

instruments, players) can be connected to the four input channels.

Mono channels CH1 and CH2:

Combo XLR/¼-inch jacks are available as inputs.

Connect microphones to the balanced XLR jack.

For phantom-powered microphones it is possible to activate a 48V phantom power for both XLR

jacks together with switch PHANOM POWER. When activated (switch positionⅠ= on) the indication

PHANTOM PWR +48V lights up during operation.

Caution! Do not connect a microphone with unbalanced output via XLR plug; it may be

damaged by the phantom power. To prevent switching noise, only activate or deactivate the

phantom power.

Connect mono sources with line level to the unbalanced ¼-inch jacks. It is also possible to directly

connect musical instruments with high impedance (electric guitar, electric bass) to these jacks: in

this case engage the impedance switch for that channel.

Stereo channels CH3/4 and CH5/6:

Stereo sources with line level may be connected to the ¼-inch jacks of channel CH3/4 and to the

RCA jacks of channel CH5/6 (L=left channel, R= right channel). The jacks of channel CH3/4 are

balanced; however, it is also possible to connect units with an unbalanced output. For connecting a

mono unit to channel CH3/4, use the Left jack only: Then the mono signal is internally sent to the

right channel and the left channel.

2. The RCA jacks Aux can be used for connection of a stereo recording device.

3. Connect the replay output of the stereo recording device to the input AUX IN;

4. Connect the recording input of the recording device to the output AUX OUT; the output receives the

sum signal adjusted with the control MASTER MIX

5. However, the connections may also be used for other units with line signal level, e.g., like a CD or

MP3 player may be connected to AUX IN or an amplifier to AUX OUT.

6. Connect stereo headphones (impedance ≥8 OHM) to the ¼-inch jack MONITOR PHONES.

7. The sum of the signals are adjusted with the control MAIN MIX, the audio is present at the stereo

output MAIN MIX OUT.

8. Here e.g., an amplifier or a second mixer may be connected. The ¼-inch jacks are unbalanced

9. For power supply, connect the power adapter provided to the jack 5VDC and to a mains outlet

(115VAC or 230VAC).

10.Note: If the mixer is not used for a long period of time, then disconnect the power adapter from the

socket. Even when the mixer is switched off, the power supply unit has low power consumption.

11.To switch on the mixer, set the POWER switch to position “ON”. The power indication POWER ON

lights up.

CONTROLS AND INDICATORS

Phantom Power Switch (+48 V) for the XLR jack of channels CH 1 and CH 2.

Power Mains switch of the mixer.

Power supply jack It is used for connecting the power supply adapter, provided.

USB jack (type B) for the connection to a computer: it can be used both as an audio output (output of

the sum signal) and as an audio input (feed-thru audio data for reproduction via channel CH 5/6).

Combo Input (combined jack XLR, balanced / ¼-inch jack unbalanced) for channel CH 1 and channel

CH 2, for connection of a microphone via an XLR plug or an audio source with line signal level via a ¼-

inch jack.

Instrument/Line Impedance switch, for channel CH 1 and channel CH 2: engage the switch when an

electric guitar or an electric bass with passive audio pick-up has been connected to the ¼-inch jack.

Stereo Input (¼-inch jack, bal.) for channel CH3/4 for connection of an audio source with line signal

level; when connection a mono source, use the Left jack only.

Stereo Input (RCA) for channel CH5/6 for connection of an audio source with line signal level.

Aux Output (RCA) from the mixer to a Stereo Input.

Aux Input (RCA) from the mixer to a Stereo Output.

Main Mix Out (¼-inch jack, unbalanced) for a connection of an amplifier or another unit, e.g. a second

mixer.

Phones Monitor Output (¼-inch jack) for connection of stereo headphones (minimum impedance

8Ohm) for monitoring the sum signal independent of the master control or the signal at the input Aux

In.

USB Playback Switch assigns signal of USB jack to channels CH5/6 or to MONITOR PHONES.

Assign to Main Used to switch the input signal of the input AUX INPUT to the Main Mix output.

Assign to Monitor Used to switch the input signal of the input AUX INPUT to the headphone output.

GAIN Control to adjust the input amplification, for channel CH 1 and channel CH 2.

Channel Equalization Equalizer to adjust the high frequencies ( EQ HI ) and low frequencies (EQ LO),

for each input channel.

Effect Control For each input channel, to adjust the effect component for each channel.

Pan Control For channel CH1 and CH2, to place the mono signal in the stereo field.

Balance Control For channel CH3/4 and CH 5/6.

Clip LED Level peak indication, for channel CH1 and CH2.

Level Control For each input channel.

FX Mute Switch, when the button switch engaged, the internal effect processor is muted at its output,

and the LED will light up.

FX Return Control to add the effect signal to the sum signal.

Phones Monitor Controls the level for the headphones output.

DSP Effects Control pot switches to select the effects.

Phantom Power +48V Indicator, this lights when the Phantom Power switch is set to ON for CH1 and

CH2.

Power On Green indicator LED is illuminated when the mixer is powered up.

Stereo level indicator LED’s, the sum signal adjusted with the master control; in case of overload the

CLIP LED’s light up.

Main Mix Control sets the level of the output signal sent via the outputs MAIN MIX, AUX OUTPUT and

the USB port.

OPERATION WITH A COMPUTER

When operating the mixer with a computer, either use the audio software supplied with the operating

system or audio software installed additionally. Various programs for audio reproduction/ recording are

available on the Internet free of charge.

1. Boot up the computer and connect the USB jack to a USB port at the computer via the USB cable

provided. The USB interface of the mixer is recognized by the computer as an external unit for audio

input and audio output, depending on the operating system e.g., as “USB Audio CODEC”. The

required drivers (standard drivers of the operating system) are available on the computer.

2. Note: If not all drivers required are available on the computer, install them, e.g., via the original CD

of the operating system. If necessary, restart the computer after installation.

3. Activate the audio program used and make the necessary adjustments for the audio reproduction

via the mixer or audio recording from the mixer.

If no audio recording or audio reproduction is possible, check in the system settings of the computer if

the USB interface has been selected for the audio input or audio output.

Hint: If the mixer is connected both to a computer and to any equipment, which have earth ground

mains cables (e.g. amplifiers), ground loops may occur due to hum interference. To eliminate this, the

mixer should be connected to the respective equipment via a ground isolator.

USB COMPUTER SETTINGS

Once the USB connection is made and your computer is on, your computer will power the USB

interfaces circuitry over the USB bus and the unit will automatically connect and try to set your computer

“Default Audio Device” to be “USB Audio CODEC”. Usually, the computer will do this automatically

whenever a USB device is first connected, but it is sometimes necessary to make the selection

manually. The same settings may need to be made in your particular audio application as well (Check

your application instructions). These settings should be made while the USBMIX6 and computer are

connected and powered on.

Your computer audio output “Speaker” is now set to be the “USB Audio CODEC” and playback audio

is routed to the USBMIX6. This must be done while the USBMIX6 is connected to the computer and

powered on. If you prefer, you can have the computer output routed to your computer speakers instead

of the USBMIX6 monitor output jack, by selecting your computer speakers for “OUTPUT” instead of

“USB Audio CODEC” in the above setup procedures. After the above settings are made, your computer

will automatically reconfigure itself back to these settings every time the USBMIX6 is reconnected to

the computer. Your recording software may also select which inputs or outputs are being used.

Note: The USBMIX6 interface uses the standard “USB Audio CODEC”. This driver is built into most

modern operating systems, including most current versions of Linux. Since some details of how the

audio interface is set vary with different versions of Linux, the setup is beyond the scope of this

document. The main key in setup is to look for “USB Audio CODEC” as the recording source or playback

monitor output while the USBMIX6 is connected.

APPLICATIONS

The following basic steps serve as an aid for a general setup.

1. As a basic setting first

a. set all control GAIN, EQ, PAN /BAL to mid-position.

b. Turn all control LEVEL back to "0".

2. To adjust a mono channel to an optimum level, feed an audio signal to the channel and turn up its

control LEVEL approximately to mid-position. Adjust the control GAIN of the channel so that the 0

dB LED's of the level indication shortly light up at passages of highest volume. Then adjust the

sound with the controls EQ: High for the high frequencies, Low for low the bass frequencies. As the

sound adjustments affect the channel level, readjust the gain adjustment, if necessary. Then turn

the control LEVEL back to the stop and make the same adjustments for the second mono channel.

3. For the sound adjustment of a stereo channel turn the controls LEVEL of the remaining channels

back to the stop and turn up the control LEVEL of the respective stereo channel so that the sound

can be adjusted in an optimum way with the equalizer controls

4. When all adjustments for level matching and all sound adjustments have been made, mix the signals

of the input channels in the desired volume ratio with the LEVEL controls. The CLIP LED's of the

mono channels should not flicker at all or only flicker shortly at signal peaks. If they light up

continuously attenuate the volume of the channel. Always turn the LEVEL controls of the channels

not used back to the left stop.

5. For the mono channels place the mono signals in the stereo sound with the PAN controls and adjust

the stereo balance for the stereo channel with the Balance controls.

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