SANSUI AU-D507X
¥ 65,000 (released in 1984)
Commentary
This is an integrated amplifier that pursues high quality in this class by adopting X balanced amplifier.
The basic configuration of the amplifier is an X-balanced amplifier.
This circuit is isolated from ground and is perfectly balanced from the signal circuit, power circuit and NFB circuit. In addition to fully balanced operation from the input circuit, two amplifiers for the + and - sides drive the speakers at the output stage, and balance feedback is applied at both the positive and negative sides. Thus, excellent speaker drive capability is obtained without influence of ground and other factors.
The equalizer uses a high-precision equalizer to achieve a wide range and high precision RIAA deviation of ± 0.2 db from 20 hz to 300 khz.
Parts such as resistors, condensers and large aluminum heat sinks are used to improve sound quality by using non-magnetic materials.
Tape input 2 circuit is mounted.
It also has a REC selector that allows you to record and output a source other than the one being played back.
It uses a twin relay speaker switch that can connect two types of speakers.
Equipped with a subsonic filter.
Uses AC power cord with polarity display.
There are 2 color variations of black and silver.
* In the generation of AU-Dxx7X Decade, it is described as twin diamond X balance amplifier, but the configuration is the same as X balance amplifier.
Therefore, the AU-D507X is labeled as an X-balanced amplifier in the 1984 catalog and as a twin diamond X-balanced amplifier in the 1985 catalog.
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Model Rating
| Type | Integrated DC amplifier |
| <Power Amplifier Section (Twin Diamond Balanced Drive Amp system)> | |
| Effective output (both channel drive) | 90W + 90W (6 ohm, 10 hz to 20 khz) 80W + 80W (8 ohm, 10 hz to 20 khz) 105W + 105W (4 ω, 1 kHz) 95W + 95W (6 ohm, 1 khz) 85W + 85W (8 ohm, 1 khz) |
| Total harmonic distortion factor | 0.003% (8 Ω, 10 Hz to 20 kHz, Effective Output) 0.005% (6 Ω, 10 Hz to 20 kHz, 1/2 Effective Output) |
| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.003% (8 Ω, Effective Output) |
| Output Bandwidth (IHF, both channel operation, THD0.03%) | 5 Hz to 70 kHz |
| Damping factor (new IHF, 20 Hz to 20 kHz) | 80 (6 Ω) |
| Frequency Response (1W) | DC ~ 200 khz + 0 -3dB |
| Envelope distortion | Below the measurement limit |
| TIM Strain (Sawtooth method) | Below the measurement limit |
| Slew rate | ± 180 v / μ sec (6 Ω) |
| Rise time | 0.8 μ sec |
| <Equalizer amplifier section (Hi-precision equalizer)> | |
| Input Sensitivity / Input Impedance (1 kHz) | Phono MM : 2.5mV/47k Ω Phono High MC : 2.5mV/100 Ω Phono MC : 300 μ V/100 Ω CD, Tuner, Tape1, 2 : 150mV/47k Ω |
| Phono maximum allowable input (1 kHz, THD 0.01%) | MM:180mV High MC:180mV MC:18mV |
| Output Level / Impedance | Tape rec : 150mV/600 Ω |
| RIAA Deviation (MM, Rec out) | 20 Hz to 300 kHz ± 0.2 dB |
| Signal-to-noise ratio (A network, short circuit) | Phono MM:88dB Phono MC:70dB CD, Tuner, Tape : 105 dB |
| Tone control | Bass : ± 10 dB (50 Hz) Treble : ± 10 dB (10 kHz) |
| Subsonic filter | 16 Hz (-3dB, 6dB/oct.) |
| Loudness (Volume-30dB) | + 10 dB at 50 Hz, + 6 dB at 10 kHz |
| <General> | |
| Rated power consumption (Electrical Appliance and Material Control Law) | 155W |
| External dimensions | Width 430x Height 145x Depth 332 mm |
| Weight | 10.2kg |