Audio Database


Pioneer D-23
100,000yen(around the 1980 time)

The crossover network which thought [ that multi-amplifier 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 low-noise transistor of a pair to which the property was equal, and, thereby, is reducing the eventh higher-harmonic 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 right-and-left independency.

Multi-izing to four ways is possible for a band splitting at four splittings of Low/Mid-Low/Mid-High/High.
A cut-off frequency is the 11-point selection for every one-third 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 multi-amplifier system various type from two ways to four ways can be freely constituted by utilizing this in it.

Rating of a mode
Form Electronic crossover network
Circuit system
Buffer amplifier part : Positive/negative 2 power-source Class-A SEPP
Filter part : CR passive filter (6 dB/oct, 12 dB/oct)
CR active-filter +CR passive filter (18 dB/oct)
2, 3, 4 way possible
Cut-off 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 0--30dB (1dB step), -infinity, a right-and-left channel independent variable
Insertion loss 0--2dB
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)
AC outlet Power-switch un-interlocking.: One line
Dimensions Width 420x height 150x depth of 352mm
Weight 8.7kg