AER Colourizer 2 Panduan Pengguna - Halaman 11

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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 Europe, 120V in the USA)

is suitable for the voltage input 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 24V DC power supply is a certified wide-range model,

capable of handling input voltages between 100V and 240V.

A substantial amount of research, effort and testing went into

the selection of this power supply. It is critical to the function

of the preamp – please don't use any other power supply!

Also please bear in mind that any device powered from a

power supply (as opposed to battery operation), 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 unwanted earth or

ground loops that occur when using several earthed mains

powered devices in the signal chain

Please ensure that both the tone balance and the equalizer

level controls are in their middle position (centre detent)

and all other controls are turned all the way to the left. The

pushbuttons should be off, i.e. not pushed.

Make all signal cable connections as desired (e.g. instrument

or microphone to input, line out to amplifier input and maybe

DI out to the mixing desk input). Now you can connect the

unit to the power supply.

The green power control LED indicates operational readiness.

4.2 Level adjustment

The colourizer 2 is equipped with a high-quality preamp

which can handle line and microphone signals and has there-

fore a wide input sensitivity range.

Using the Attn-switch, selects the preamp function to suit

your signal source. Attn-switch pressed is suitable for micro-

phones. (with condenser microphones please activate 24V

phantom power)

Attn-switch released should be used for instrument pick-up

systems and most other signal sources.

The gain control is used to match the colourizer 2 input stage

to your signal source, ensuring optimum function with the

best possible signal-to-noise ratio (SNR).

Having selected the appropriate preamp function with the

gain controls set fully counter clockwise (minimum gain), turn

up the gain whilst playing your instrument until the red clip

indicator 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 headroom for

undistorted reproduction.

During play, the clip control LED should only flicker.

With line sources with a sufficient input signal level, the gain

controls will probably sit between minimum gain and the

10 o'clock position. It's likely that in not pressed position the

setting will be significantly higher.

Finally the desired output level of the line output is controlled

by the volume control. Please note that some of the filter sta-

ges are active and will therefore affect the overall level setting

Note: Level adjustment

By setting the level correctly we mean that the signal level in

one or several devices in a signal chain is neither too high nor

too low.

This applies equally to all components of a unit (here tone,

enhancer or equalizer included).

Consequently, care must be taken that no part of the circuit is

overloaded, or that distortion is unintentionally added to the

signal. We have carefully designed the circuit to achieve this

objective whilst also providing potentiometers (gain, level,

volume) for „manual" intervention.

5. Functional Characteristics

5.1 DI level

The DI-out carries a balanced preamp signal. The DI level

control determines the preamp's output signal level.

5.2 Phase

The phase switch allows reversal of the phase of the output

signal of the colourizer 2 relative to the input signal by 180°,

thus matching it to the phasing of other devices in your signal

chain.

5.3 24V Phantom power

The 24V phantom power switch is located on the rear side of

the housing. This provides phantom power to the XLR input

for devices that require it eg condenser mics. The 24V phan-

tom supply of your AER device complies with the

DIN EN 61398 regulations in view of a 24V phantom power

supply. Please note the supplement text on page 7.5.4 Filter

network and filter stages

5.4.1 Tone Balance – How does it work?

The „tone balance" is served by the two controls:

balance and intensity.

The intensity control determines the degree to which bass

and treble are increased simultaneously and are mixed to

the original signal (parallel mode). If the intensity control is

far over to the left (min, s. fig.), then the original signal is not

influenced (flat). Turning the control to the right

(—> mid —> max) mixes the relevant bass and treble mix to

the original signal.

The balance control influences the relationship between bass

and treble. If it is in middle setting, bass and treble are balan-

ced. The tone balance is now in equation. (s. fig. 1)

If you turn the balance control to the left (fig. 2), the bass

range is further increased, but the treble is decreased by max.

0dB.

A turning to the right (fig. 3) affects an increase in treble whilst

at the same time reducing the bass.

In its function and signal path the tone balance is delibera-tely

designed as a somewhat „different" equalizer. It offers a com-

fortable way of giving the original signal more zip wit-hout

distorting it.

Especially on those occasions, when the equalizer has to be

used to suppress resonance or feedback.