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Deep
Mid-Hi Tune
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The DEEP circuit increases the processed bass range. The bass range
encloses frequencies between ca. 20 Hz and 110 Hz with a bass centre
frequency at 50 Hz. The D
EEP function enlarges this range to approx. 16 Hz
to 140 Hz with the same bass centre frequency and increases the amplifi-
cation level by ca. 3 dB.
The M
ID-HI TUNE control is used to set the starting frequency of the
broad-band shelving filter. In line with the setting of P
ROCESS control, all
frequencies above this value right through to the end of the audio range
are processed.
The control range of the M
ID-HI TUNE control is between 1 kHz (extreme
right) and 20 kHz (extreme left). In practice, common settings vary
between 3.5 kHz and 8 kHz.
As the human ear perceives the range between 1 kHz and 3 kHz parti-
cularly clearly, at all volumes between 0 and 120 phon it makes sense to
adapt this frequency range. You might feel inclined to say "Yes, but I do that
with my graphic EQ as well". The main difference is that the graphic EQ
really reduces the effective loudness of the frequency, i.e. cuts out the
appropriate frequencies, thus changing the spectral content of the original
signal. The V
ITALIZER , however, relies on a more subtle method of ampli-
tude-depending phase shifting. This does not involve altering the spectral
composition of the signal but it does maintain the subjective impression of
loudness. Moreover, graphic equalizers produce comb-filter effects because
of the interaction between adjacent filters, when broad-band frequencies
are raised. The M
ID-HI TUNE filter can raise the broad-band spectrum with a
very linear frequency response, without colouring the signal.
Above the M
ID-HI TUNE value set, the VITALIZER filters create a linear
increase, i.e. one that is adapted to the human ear. This compensates any
inability of our hearing as regards perceiving frequencies ranging between
5 kHz and 10 kHz. The M
ID-HI TUNE filter works with a wide bandwidth
and always sounds musical, never „bell-like“. Gradually go down from 20
kHz (extreme left) to lower frequencies. The further down you go, the
brighter the sound image becomes, as an increasing number of frequencies
are included in the process.
The M
ID-HI TUNE control can also be used to tone down excessively
sharp-sounding material, by setting frequencies of 10 kHz or higher, and
setting the P
ROCESS control on MAX. Seeing as the PROCESS control is also
responsible for deleting dominant mid frequencies, all frequencies are
gradually reduced down to the application frequency, in conjunction with
high starting frequencies of the M
ID-HI TUNE control.
The VITALIZER's control elements