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Features . . . . . . . . . . . . . . . . . . . . . . . . . .
Multi-Amplifier Systems . . . . . . . . . . . . . .
Connection Diagram . . . . . . . . . . . . . . . . .
Connections . . . . . . . . . . . . . . . . . . . . . . .
Precautions . . . . . . . . . . . . . . . . . . . . . . . .
Front Panel Facilities . . . . . . . . . . . . . . . .
Before Operating The D-23
FEATURES
Low Noise Filters with Low Insertion Loss
The D-23 employs only high performance filter circuits
comprised of high quality capacitor, resistor, and pair
transistor-equipped SEPP circuits. For the 6dB/oct and
12dB/oct slopes, 1-stage and 2-stage RC-type passive filters
are employed. The 18dB/oct slope is obtained by means of
a 12dB/oct active filter (with excellent cut-off characteris
tics) combined with a 1-stage 6dB/oct RC-type passive
filter. In the selection of crossover frequencies, the use
of
specially
designed
high-precision
permit very accurate adjustments for every 1/3 of an
octave. Furthermore, use of only high quality components
throughout has resulted in improved stereo separation.
Low Distortion Buffer Amplifier
The D-23 has pair transistor-equipped SEPP circuits at both
input and output stages. Signals from the preamplifier are
thus sufficiently amplified before being applied to filters of
each frequency range. Consequently, input impedance and
dynamic range are increased, thus preventing any adverse
effects on the low-impedance connected filter elements in
the following stages. In addition, the SEPP circuits also
eliminate distortion caused by the 2nd and other even
harmonics. Resultant distortion is very low indeed.
Effective Selection of Crossover Frequency by
6 Independent Switches
The D-23 features 11 different selectable crossover fre
quencies between the low and low mid-range frequency
regions, ranging from 63Hz to 630Hz, each increasing in
steps of 1/3 of an octave. Similarly, the low mid-range to
high mid-range, and the high mid-range to high frequency
"joints"
also
have
11
different
between 320Hz and 3.2kHz, and
respectively. Furthermore, since it is possible to select
frequencies with the controls in each frequency range, it is
also possible to set crossover frequencies apart from the 11
CONTENTS
2
3
4
5
5
6
. . . . .
. . .
. 10
.
.
variable
resistors
crossover
frequencies
1.6kHz and 16kHz,
Operational Procedure
.
4-Way Amplifier Systems . . . . . . . . . . . . . 11
3-Way Amplifier Systems . . . . . . . . . . . . . 1 2
2-Way Amplifier Systems . . . . . . . . . . . . . 13
Characteristics Charts . . . . . . . . . . . . . . . . 15
Specifications . . . . . . . .
basic frequencies. This permits the user to select just the
right crossover frequencies to get the best results from the
speakers
employed.
Moreover in combination with the
slope switches, the user is able to compensate for any dip or
peak occurring at the crossover frequencies, these usually
being due to the acoustical characteristics of the room and
the characteristics of the speaker combination.
3-Way Slope Switches
The slopes at the cut-off frequencies in each frequency
range may be set to 6, 12, or 18dB/oct. Besides selecting
the most suitable crossover frequencies to match the
acoustical characteristics of the room and speakers, the user
can also adjust the slope to gain optimum continuity of
sound from one frequency range to another.
Furthermore, the slope controls in the LOW, MID-LOW,
and MID-HIGH ranges also include a FLAT position which
permits the D-23 unit to be connected up in various com
binations of 3-way
and 2-way multi-amplifier systems,
depending on the number and type of speakers available.
Independent Level Controls for Each Frequency
Range
The D-23 is equipped with independent level controls for
separate left (L) and right (R) channel level adjustments in
all 4 frequency ranges (i.e., LOW, MID-LOW, MID-HIGH,
and HIGH). Individual level adjustments can thus be made
in order to match room characteristics, and the efficiencies
of the power amplifiers and speakers. All level controls
also have memory markers to assist in level comparison
testing and fine adjustments.
Functional Beauty Plus Impressive Design
The D-23 also features a very impressive front panel design
with easy-to-operate controls laid out in a very functional
fashion.
Combination
with
means uniformity among all components, giving audio
enthusiasts an outstanding multi-amplifier system.
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other Pionner
components
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