AER DUAL-PARA EQ Manuel de l'utilisateur - Page 6

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Note: Level compensating amplifier

The dual para eq is not an instrument preamp. Consequently

it is not recommended to directly connect e.g. a microphone

or a guitar pickup to the dual para eq.

The dual para eq features a high-quality level adjustment

stage (feasible for pro audio and hifi levels) which allows to

set the gain within a +/-10 dB range. The centre position is

equivalent to 0 dB, i.e. the level remains unchanged (unity

gain). Turning this control counterclockwise will lower the si-

gnal level, turning it clockwise will boost it.

4.2 Level adjustment

For the dual para eq the line output level delivered by the

preceding device should already be sufficient for an optimal

drive thus an actual level setting is not necessary. Please

note that the filter stages of the dual para eq are active and

will therefore affect the overall level setting.

The clip indicator monitors all critical points in the signal

path and indicates excessive signal levels (overdrive, distor-

tion). In that case turn down the gain control to lower the

signal level. However, with too high signal levels in the dual

para eq (clipping) it may be advisable to lower the signal le-

vel on the preceding unit.

5. Functional Characteristics

5.1 phase

The phase switch allows reversal of the phase of the out-

put signal of the dual para eq relative to the input signal

by 180°, thus matching it to the phasing of other devices in

your signal chain.

5.2 bypass (bypass switch)

The bypass is designed as a „hard-wire"-type – directly con-

nected – bypass. This means that while in bypass mode, the

signal will not pass through any other electronics, the dual

para eq is completely bypassed. The bypass switch allows

you to compare the input signal with the signal processed

by the equalizers (A/B comparison). In case of an A/B com-

parison the gain control is used to compensate the level dif-

ferences of the signals to be compared. (see above 4.2 Level

adjustment).

5.3 equalizer

The equalizers are two parametric filter networks, adjustab-

le from 90 Hz bis 11 kHz in two ranges. f1 = 90 Hz – 1,6 kHz

and f2 = 680 Hz – 11 kHz. The ranges have been designed

to meet the special requirements of acoustic instruments,

microphones and other signal sources and to allow useful

and accurate signal manipulation in order to suppress reso-

nances and feedback. The filter technology ensures a cons-

tant bandwidth at any selected frequency.

Note:

A parametric equalizer is a filter network where all features

of a filter (amplitude, i.e. boost or cut = level, frequency and

Q factor = bandwidth) can be adjusted. Parametric means

that not only the boost /cut, but also the location and width

of the frequency bands can be adjusted. It offers the possi-

bility to equalize (flatten) notches or peaks in the frequency

response (hence the name equalizer) and to suppress feed-

backs or resonant peaks. It can also be used as a flexible

tone control for targeted sound alterations.

Sample application:

Suppose you notice an excessive signal increase (feedback).

To counteract you will need to reduce the sig-nal level of the

corresponding frequency range. To do this, first set the level

control (amplitude) to maximum cut (left-hand stop). Make

sure that the bandwidth control is set to maximum band-

width (right-hand stop). Using the frequency control you

can now detect the centre frequency of the offending fre-

quency range. (use the f1/f2 preselect switch also) The peak

should now be gone. To enhance the sonic result, you may

reduce the bandwidth (increase the Q factor) or lower the

amplitude (decrease the reduction), if necessary.

Experiment and enjoy your new route to alternative sound-

scapes!

Thanks for reading!