Pioneer D23 

100,000yen(around the 1980 time) 
The crossover network which thought [ that
multiamplifier can be broadly enjoyed from two ways to four ways, and ] the
variegated functionality and the basic performance as important.
The
buffer amplifier of a main circuit has pure complimentary SEPP circuit
composition of ±2 powering with the lownoise transistor of a pair to which the
property was equal, and, thereby, is reducing the eventh higherharmonic
distorted component.
Moreover, the Output load impedance was highly set up
for the input impedance low, and the influence of CR element of a filter is
prevented.
Furthermore, the power source has eliminated the cross
interferencee between channels while it supplies the high voltage of +30V and
22V and secures a large dynamic range by the voltage stabilizer which achieved
the rightandleft independency.
Multiizing to four ways is possible
for a band splitting at four splittings of Low/MidLow/MidHigh/High.
A
cutoff frequency is the 11point selection for every onethird octave,
respectively, and the high cut and the low cut have been independent.
The
level control of each band has adopted the attenuator type of a 1dB step.
The shutdown slope can choose three kinds, 6, 12, and 18 (dB/oct).
Although the attenuation in a crossing point of 6 dB/oct and 18 dB/oct is
3dB, in 12 dB/oct, since it may have been piled by the property due to a phase
when it is made to cross by 3dB, only when it is 12dB / oct, it is considered
as a 6dB cross.
A low cut of a High position is removed in a slope change,
the flat position is altogether carried in it, and the multiamplifier system
various type from two ways to four ways can be freely constituted by utilizing
this in it.

Form 
Electronic crossover network

Circuit system 
Buffer amplifier part : 
Positive/negative 2 powersource ClassA
SEPP 
Filter part : 
CR passive filter (6 dB/oct, 12 dB/oct)
CR activefilter +CR passive filter (18 dB/oct)
2, 3, 4 way possible


Cutoff frequency 
Low (High Cut), Mid Low (Low Cut)
63,
80, 100, 125, 160, 200, 250, 320, 400, 500 or 630Hz
Mid Low (High Cut), Mid
High (Low Cut) :
320, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.5kHz
Mid High (High Cut), High (Low Cut) :
1.6k, 2k, 2.5k, 3.2k, 4k, 5k, 6k,
8k, 10k, 12.5k, 16kHz 
Slope property 
6 dB/oct, 12 dB/oct, 18dB / oct

Level control 
030dB (1dB step), infinity, a
rightandleft channel independent variable 
Insertion loss 
02dB 
Input impedance 
100kohm 
Output load impedance 
4kohms (MAX) 
Output (RL:50kohm) 
1V, 10V (MAX) 
THD (20Hz  20kHz) 
0.005% (1V output)
0.1% (10V output)

Frequency characteristic (Low end/High end)

10Hz/100kHz +0 1dB 
SN ratio (output 1 V:00) 
100dB (IHF, A network, a short circuit)

The semiconductor used 
Transistor: 71 pieces
Diode, other:18
piece 
Supply voltage 
100V, 50Hz/60Hz 
Power consumption
(Electrical Appliance and Material Control Law) 
11W 
AC outlet 
Powerswitch uninterlocking.: One line

Dimensions 
Width 420x height 150x depth of 352mm

Weight 
8.7kg 


