AER pocket tools dual mix Manuel de l'utilisateur - Page 5
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4. Operation Summary
4.1 Cabling and Starting-up
Before connecting to the mains, please ensure that
your local mains voltage (e.g. 230V in mainland Eu-
rope, 120V in the USA) is suitable for the voltage in-
put range of the included power supply. The relevant
specs and safety symbols are printed on the rear side
of the unit.
Note: 24V power supply
The included 24VDC power supply is a certified wide-
range model, capable of handling input voltages
between 100V and 240V. A substantial amount of re-
search, effort and testing went into the selection of
this power supply. It is critical to the function of the
preamp – please use no other power supply!
Also please bear in mind that any device powered
from a power supply (as opposed to battery operati-
on), may suffer interference carried by the electricity
supply itself. To avoid this, always try and keep signal
cables as short as possible.
We have opted for a "non-earthed power supply" (class
2 with protective insulation) in order to avoid unwan-
ted earth or ground loops that occur when using sever-
al earthed mains powered devices in a signal chain.
Please ensure that gain-, level- and volume-controls
are turned all the way to the left and all other cont-
rols are in their middle position (centre detent). The
pushbuttons should be off, i.e. not pushed.
Now select the appropriate preamp function (line/mic)
and make all required cable connections:
1) Instruments (1/4" jack or XLR) or Microphones (only
XLR) to input channel 1 and/or channel 2 of the dual mix
2) line-out of the dual mix e.g. to effects return of the
effect loop of an AER amplifier or to the input of a
downstream device
You may also want to connect:
1) the DI-out of the dual mix to a mixing-desk input or
a stagebox (use balanced cables for this)
2) a CD/MP3 player to aux-in or
3) a stereo headphone set to the headphones output
4.2 Level adjustment
Note: Level adjustment
By setting the level correctly we mean that the signal le-
vel in one or several devices in a signal chain is neither
too high nor too low. This applies equally to all compo-
nents of a unit (here e.g. high and low).
Consequently, care must be taken that no part of the
circuit is overloaded, or that distortion is unintentio-
nally added to the signal. We have carefully designed
the circuit to achieve this objective whilst also provi-
ding potentiometers (gain, level, volume) for „manu-
al" intervention.
The dual mix is equipped with two high-quality pre-
amps which can handle line and microphone signals
and have therefore a wide input sensitivity range.
Having selected the appropriate preamp function (mic
or line) and with the gain controls set fully counter
clockwise (minimum gain), turn up the gain whilst
playing your instrument until the red clip indicator
LED lights up occasionally with heavy strumming. Now
turn down the gain control (or the volume control on
the source) by a tiny amount to allow additional head-
room for undistorted reproduction.
During play, the clip control LED should only flicker in-
termittently at most. With line (signal sources with a
sufficient input signal level) the gain controls will pro-
bably sit between minimum gain and the 10 o'clock
position. It's likely that in the mic position the setting
will be significantly higher. Please keep in mind that
the filter stages are partly active and thus have an in-
fluence on the overall adjustment of the dual mix.
5. Functional Characteristics
5.1 Inputs Channel 1 and Channel 2
5.1.1 Signal Sources and Preamp Selection
Various signal sources may be connected to the XLR/
line combo sockets (channel 1 und 2). To Line (6.3 mm
jack socket): all types of active and passive pickups for
acoustic instruments, electromagnetic pickups, key-
boards, samplers. To XLR socket: all dynamic and con-
denser (vocal or instrument) microphones. The corres-
ponding preamp is selected by the line/mic-switch.
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