Sound Performance Lab EQ MAGIX - Manual (Page 15)

15
The A CTIVE function switches the P ARAMETRIC equalizer on or off. If the
switch has been pressed, the integrated LED indicates that the P ARAMETRIC
section has been activated.
The A CTIVE funciton is a so-called "electronic bypass". Any DC voltages
are filtered out via coupling capacitors. To increase the operational safety
of the monitor loudspeakers, you should, however, avoid switching the
parameters on or off at a loud monitor volume levels. At high amplitudes
inside the filter, there may be residual charges on the switching contacts
which may be discharged when you switch over. These may become appa-
rent as audible click sounds. If applicable, mute the monitor loudspeakers
before switching a filter on or off. The M UTE function of the O UTPUT stage of
the EQ MAGIX can be utilized for this purpose (see page 27, point 25).
The F REQUENCY control determines the centre frequency of the frequency
band which is to be processed. The outer scaling ring indicates the selec-
table frequencies when the frequency switch is not pressed. The frequency
bandwidth ranges from 280 Hz to 58 kHz.
Equalizers do not normally provide frequencies above 20 kHz. Practical
applications have shown, however, that interfere frequencies from digital
audio equipment (quantization and formantization noise, crosstalk of the
Sampling Rate etc.) can cause sound deterioration in the audible range.
This particularly involves 44.1 kHz and 48 kHz and their related subhar-
monics. The EQ MAGIX makes these frequencies accessible. They can be
removed with the N OTCH filter. (See point 12 on page 17 for more detailed
information on the N OTCH filter). For the first time you have the opportunity
to intervene in these frequency ranges with a filter and to experiment your-
self as to whether and the extent to which such crosstalks into the
programme material can be corrected.
The frequency range of the F REQUENCY control is divided by factor 20
after activating the switch (LED lights up). The control range of the
F REQUENCY control varies between 14 Hz to 3 kHz. This qualifies the EQ
MAGIX to carry out sound processing right down into the subsonic range.
With 14 Hz, the EQ MAGIX works below the range of human hearing.
This means that the filter also features phase stability and accuracy at high
amplitudes above 14 Hz.
Parametric 7
7
9
12
10 11
8
8
Active
Frequency