YAMAHA AX-700D
¥ 63,000 (released in 1987)
Commentary
Pre-main amplifier with digital direct input.
In addition to two coaxial inputs, an optical input and a coaxial output are mounted.
The sampling frequency is 32 kHz, 44.1 kHz and 48 kHz, and it automatically follows 3 modes.
The D/A converter uses an 8-times oversampling digital filter and a high-bit system with left and right independent twin DAC configurations.
Equipped with a digital direct circuit that reproduces signals from digital inputs through the shortest signal path.
In addition, it is equipped with a digital switch that suppresses the influence of digital noise. When it is OFF, the power supply of the digital circuit is turned off so that the interference between the analog circuit and the digital circuit can be prevented.
The power supply section is equipped with a powerful LiD (Low-impedance Drivability) power supply that can supply stable power without being affected by the speaker impedance that fluctuates depending on the signal frequency and signal level, enabling low-load drive.
The power stage employs an ALA (Absolute Linear Amplification) circuit to eliminate crossover distortion, switching distortion and slight distortion, and realizes linear amplification according to the input signal level.
It uses high-quality parts such as high-tone electrolytic capacitors. In addition, it uses high-rigidity bottom plates, a heat sink with excellent vibration control effects, and giant legs made of cork insulator with excellent vibration absorption characteristics.
Equipped with continuous loudness.
Equipped with a 6-position Rec out selector.
Stereo/Mono mode can be switched.
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Model Rating
| Type | Pre-main amplifier |
| Rated Output (20 Hz ~ 20 kHz) | 100W + 100W (6 Ω, strain 0.015%) 85W + 85W (8 Ω, Distortion 0.01%) |
| Power bandwidth | 10 Hz to 50 kHz (42.5W, 8 Ω, 0.03% strain) |
| Input Sensitivity / Impedance | MC : 160 μ V/220 Ω MM : 2.5mV/47k Ω CD, etc : 150mV/47k Ω |
| RIAA deviation | 20 Hz ~ 20 kHz ± 0.5 dB (MC) |
| Total harmonic distortion factor (20 Hz to 20 kHz) |
MC:0.007% MM:0.003% |
| S/N ratio (IHF-A) | MC:70dB MM:86dB CD, etc : 106 dB |
| Tone control (Maximum Variable Width) |
Treble : ± 10 dB (3.5 kHz) Bass : ± 10 dB (350 Hz) |
| Loudness | Continuus |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 170W |
| External dimensions | Width 435x Height 139x Depth 332 mm |
| Weight | 9.6kg |