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EFFECTIVE OPERATIONS
TWIN BASS AND TREBLE TONE CONTROLS
Adjust each of the controls for the following sound
effects.
'Using
only
the
main
controls
(BASS:
100Hz,
TREBLE;
10kHz)
provides
the same
function
as
conventional
audio tone controls. Employing the
sub-controls
(BASS:
50Hz,
TREBLE;
20kHz),
however,
has
the
same
effect
as
changing
the
turnover
frequencies. The combined
operation
of
both controls will produce a broad range of tone
variations as shown in Fig. 6 & 7.
— Response
in dB
50100
400
2.5k
10k 20k
~—> Frequency (Hz)
Adjusting
first the main,
then
the sub controls can
provide the range of adjustment shown by the shaded
areas in the figure.
Fig. 6
— Response
in dB
'
i
0
100
400
2.5k
10k
— Frequency (Hz)
With
BASS
and TREBLE
main controls set at OdB,
adjustment
range of the sub-controls
will be as shown
by the shaded areas in the figure.
Fig. 7
Examples of effective operation
e If the BASS controls are adjusted as in Fig. 8,
low frequencies in the 100Hz — 150Hz region,
which
delicately influence the bass impression,
can be enhanced. While retaining an overall flat
impression, slightly more weight can be obtained
in the low frequency: band (A). Since the oppo-
site
adjustment
can
also
be preformed,
it is
possible
to improve
such
effects
as
standing
waves and
extended
reverberations,
which
can
occur
in reinforced
steel framework
buildings
and create an unnatural effect (B).
————.§S
PIONEER
—> Response
in dB
100Hz
150Hz
— Frequency (Hz)
Adding slight body to low frequencies
Fig. 8
e High frequencies
can be aaiusted with the twin
TREBLE
controls to compensate for the quaver-
_ ing that' often occurs with moving magnet (MM)
cartridges and
to obtain
a reproduced
sound
| with
a.completely flat response. To cite another
example, when conventional
tone controls are
used to enhance high frequencies from records,
ultra high frequency.peaking can occur from the
cartridge. This drawback. is. 'eliminated by the
twin control system' which can enhance 8kHz —
10kHz frequencies while maintaining an overall
flat. pesHensey,
re
Co mpensation curve a
FT
Cartridge response — "Composite curve
> Response
in
dB
> Frequency. (Hz).
Compensation
for cartridge high frequendy
'hollowness"'
MB. 9
NOTE:
You
can
use
the CARTRIDGE
LOAD
switches
to com-
pensate for the frequency response at the high-end of MM
cartridges.
For further details,
refer to "LOAD
RESIST-
ANCE AND LOAD
CAPACITANCE"
on page 12.
e Fig. 10 shows an example of where the adjust-
ment
of
the
BASS
and
TREBLE
controls
together can have the relative effect of enhanc-
ing the mid-range. This is effective in producing
an audio "close-up" of a singer's voice.
— Response
in dB
—> Frequency (Hz)
Relatively enhancing the mid-range
Fig. 10
11
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