Pioneer D-23
¥ 100,000 (around 1980)
Commentary
A crossover network that emphasizes various functions and basic performance so that you can enjoy a wide range of multi-amplifiers from 2-way to 4-way.
The buffer amplifier of the main circuit is a pure complimentary service SEPP circuit configuration with ± 2 power supply using a pair of low-noise transistors with uniform characteristics. This reduces even-order harmonic distortion components.
In addition, the input impedance is set high and the output impedance is set low to prevent the influence of the CR element of the filter.
In addition, the power supply supplies high voltages of + 30 V and -22V by the left and right independent constant voltage circuits, ensuring a wide dynamic range and eliminating mutual interference between channels.
The bandwidth can be divided into four sections, Low/Mid-Low/Mid-High/High, and up to four ways of multiplexing can be achieved.
The cutoff frequency is 11-point selection for each 1/3-octave band, and high cut and low cut are independent.
The level control for each band is a 1-dB-step attenuator.
The cutoff slope can be selected from 3 types : 6, 12 and 18 (dB/oct).
For 6dB/oct. and 18dB/oct., the attenuation at the crossover point is -3dB. However, for 12dB/oct, when crossing at -3dB, the characteristics may increase due to the phase relationship. Therefore, only 12dB/oct is used as a -6dB cross.
All slope switches are equipped with a flat position except for the low cut of the High position. By utilizing this, various types of multi-amplifier systems from 2 way to 4 way can be freely configured.
Model Rating
| Type | Electronic crossover network | ||||
| Circuit system |
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| Cutoff frequency | Low (High Cut), Mid Low (Low Cut) 63, 80, 100, 125, 160, 200, 250, 320, 400, 500, 630 Hz Mid Low (High Cut), Mid High (Low Cut) : 320, 400, 500, 630, 800, 1k, 1.25k, 1.6k, 2k, 2.5k, 3.5 kHz Mid High (High Cut), High (Low Cut) : 1.6k, 2k, 2.5k, 3.2k, 4k, 5k, 6k, 8k, 10k, 12.5k, 16 kHz |
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| Slope characteristic | 6dB/oct., 12dB/oct., 18dB/oct. | ||||
| Level control | 0 ~ -30dB (1 dB Step), ∞, Left / Right Channel Independent Variable | ||||
| Insertion loss | 0 to -2dB | ||||
| Input impedance | 100k Ω | ||||
| Output impedance | 4k Ω (MAX) | ||||
| Output (RL : 50k Ω) | 1 v, 10 v (MAX) | ||||
| Harmonic distortion factor (20 Hz to 20 kHz) | 0.005% (1 V Output) 0.1% (10 v Output) |
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| Frequency Response (Low end/High end) | 10Hz/100kHz +0 -1dB | ||||
| SN ratio (at 1 V output) | 100 dB (IHF, A-network, short circuit) | ||||
| Semiconductor used | Transistor : 71 Diode, other : 18 pcs |
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| Power supply voltage | 100 V, 50Hz/60Hz | ||||
| Power consumption (Electrical Appliance and Material Control Law) | 11W | ||||
| AC outlet | Power switch not linked : 1 system | ||||
| External dimensions | Width 420x Height 150x Depth 352 mm | ||||
| Weight | 8.7kg |