A&D DP-9000
¥ 158,000 (around October 1987)
Commentary
A CD player developed in pursuit of the ideal form of a CD player, reproducing music signals with extreme precision, and thoroughly seeking high sound quality and high quality.
In order to pursue no vibration and no resonance, it is designed with high rigidity.
In the DP 9000, the chassis, side Itadori and mechanism mounting parts are integrally molded with aluminum die-cast. In addition, the rigidity is further increased by adopting a honeycombed structure.
In addition, 3.2 mm thick 3 kg copper plated steel plate is used for the top plate, 18 mm thick star wood material is used for the side plate, and ceramic is used for the pedestal material to completely eliminate unnecessary resonance.
In the mechanism section, the linear tracking mechanism, chassis, tray, and brushless spindle motor are made of aluminum die-cast to increase rigidity.
To prevent interference between digital and analog circuits, analog and digital circuits are completely separated from the power supply to the circuit board.
In addition, the DP 9000 uses a two transformer power supply with a toroidal core transformer for analog and a large core transformer for digital. This completely eliminates noise interference through the power supply.
In addition, the analog circuit board is separated by a shield case made of copper-plated steel plate, and the digital circuit board adopts double-sided circuit board to strengthen the shield to reduce unnecessary radiation.
The digital circuit is equipped with a 4 x over-sampling 18-bit precision 266 order digital filter that increases the sampling frequency by 4 x and eliminates sampling noise. This filter also avoids the use of high-order analog filters with steep attenuation characteristics after D/A conversion, and uses a third order GIC analog filter with superior sound quality.
The D/A converter is an independent D/A converter for the left and right channels, eliminating the phase difference between the left and right channels. The D/A converter eliminates the peculiar glitch (spike noise) because it is a glitch less high-speed D/A converter.
The output amplifier located at the final stage of the analog circuit system employs a discrete configuration DC amplifier equipped with DC servo without coupling capacitor.
All parts, including electrolytic capacitors for audio equipment, use parts developed for audio equipment.
The mechanism part is equipped with a vertical mounting type disk size stabilized clamper developed by making full use of A & D's vibration analysis technology. By clamping the inside and outside of the disk, unnecessary vibration of the disk itself is suppressed and sound quality degradation is suppressed. In addition, a brushless spindle motor with a centering mechanism is adopted for the motor.
In order to prevent problems such as sound skipping and track skipping caused by scratches and dust on the disk surface, a unique A servo system is installed.
The A servo system automatically controls servo gain corresponding to three conditions : steady state, detection of external vibration, and detection of disc surface flaws.
It has two types of digital outputs : optical and coaxial.
In addition, a digital on/off switch is mounted to prevent interference at analog output.
It is equipped with functions such as program selection, direct selection and repeat performance.
Optical isolation by Route 6 photocoupler is adopted.
Uses a φ 7.5 OFC oxygen-free copper cap tire AC cord with polarity display.
Model Rating
Type | CD Player |
Pick-up | 3-beam laser pickup |
Compound | 16-bit linear |
Error correction method | Cross Interleaved Reed Solomon |
Number of channels | 2 Channel |
Frequency characteristic | 2 Hz to 20 kHz ± 0.3 dB |
Dynamic Range (EIAJ) | 97 dB or more |
Signal-to-noise ratio (EIAJ) | 106 dB or more |
Total Harmonic Distortion Factor (EIAJ) | Not more than 0.0025% |
Wow and flutter | Below the measurement limit |
Analog output level | 2V(0dB) |
Digital output | Coaxial : 0.5Vp-p/75 Ω Light : -20dBm to -15dBm, wavelength 660 nm |
Headphone Output / Impedance | 28mW/32 Ω |
Spindle motor | Brushless DD motor |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 22W |
External dimensions | Width 460x Height 112x Depth 330 mm |
Weight | 13.6kg |
Included : Wireless Remote Control DP 9000 | |
Method | Infrared pulse system |
Dry batteries | AA x2 (DC3V) |