User Manual

STEREO
MK2-T
13
Use the Mid-Hi Tune filter to
smoothen sharp-sounding
material.
The Process control deter-
mines the ratio between Bass
Sound and Mid-Hi Tune to the
original signal.
Fig. 4:
The Fletcher-Munson curve –
“curves of equal loudness”.
Moreover, graphic equalisers produce comb-filter effects because
of the interaction between adjacent filters, when broad-band
frequencies are raised. The Mid-Hi Tune filter can raise the broad-
band spectrum with a very linear frequency response, without
colouring the signal.
Above the Mid-Hi Tune value set, the Stereo Vitalizer MK2-T
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 Mid-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 Mid-Hi Tune control can also be used to tone down excessi-
vely sharp-sounding material, by setting frequencies of 10 kHz or
higher, and setting the Process control on Max. As the Process
control is also responsible for damping dominant mid frequen-
cies, all frequencies are gradually reduced down to the applica-
tion frequency, in conjunction with high starting frequencies of
the Mid-Hi Tune control.
The Process control determines the ratio between Bass Sound
and Mid-Hi Tune to the original signal. The Process control also
determines the damping intensity of dominant mid frequencies.
This allows rapid adaptation to the loudness curves (Fletcher-
Munson curves,“curves of equal loudness”).
The human ear perceives the audio frequency spectrum at
varying sound pressure levels very differently. Perception is by no
means ‘linear’. The Stereo Vitalizer MK2-T alters the frequency
spectrum in such a way that the balance is maintained between
all frequency ranges even at varying monitor volumes. For the
human ear, the sound is more pleasant and easier to perceive
than the original.
6
Process
sound pressure level in dB
threshold of pain loudness level
frequency in Hertz