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4.2 Level adjustment

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

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 ove

rall 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.

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

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

3) a stereo headphone set to the

headphones

output

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