Audio Database

The

SANSUI AU-alpha 507XR
59,800yen(1994 release)

Description
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The Integrated Amplifier which inherited the design technique of the high-end model and was developed.

DC amplifier stream composition amplified in a straight from DC to a high-end is adopted.
Since DC amplifier does not need the capacitor of a signal path, it is not influenced by the tone quality by a capacitor, but it can reduce a low-pass time constant.

The heavy weight class power transformer which strengthened vibration proof and thermal resistance with the high-density fill, and the electrolytic capacitor only for an audio excellent in condensation / electric-discharge speed are adopted as a power-source part.
Moreover, the power transformer is installed by the strap mounting scheme hung upside down from a body upper portion, and has prevented the propagation of the oscillation by the way of using the self-weight of a transformer.

The presence control in the 4 mode which can adjust a tone-quality balance according to a listening status is carried.
Loudnesses 1 and 2 raise a high region and low-pass simultaneously, and the bass boosts 1 and 2 are raising low-pass which runs short easily with a small speaker .

The suitable tone quality is gained to the name of XR by adopting what was selected carefully as tone-quality parts, such as a resistor, and putting into practice non-magnetic-material-izing and the vibration proof performance of each part further, and also improving a basic circuit.

In order to realize a purer music play, the Source Direct which shortest-izes signal channels of communication is adopted.
Accessories circuitries, such as a tone control, a balance volume, and a Subsonic Filter, are omitted, and the pure transmit is enabled.

The MC/man month phone equalizer is carried.

The mini Detent volume is adopted as a volume.

Specification Strap

Rating of a mode
Form Integrated amplifier
Effective output (20Hz - 20kHz, both channel operation) 80W+80W (6ohm)
60W+60W (8ohm)
THD (at the time of an effective output) 0.008% or less (8ohm)
Cross modulation distortion 0.008% or less (8ohm)
Dumping factor 135 (8ohm)
Input sensitivity/input impedance (1kHz) Phono MC: 300 microvolts/100 ohm
Phono man month: 2.5mV / 47kohm
compact disk, Tuner, Line, Tape1, 2:150mV / 47kohm
Frequency characteristic Phono man month: 20Hz-20kHz}0.5dB
compact disk, Tuner, Line, Tape1, and 2:DC-200kHz+0 -3 dB
SN ratio Phono MC: 70dB or more
Phono man month: 88dB or more
compact disk, Tuner, Line, Tape1, 2:110dB or more
Tone control The Bass maximum variation: }8dB (50Hz)
The Treble maximum variation: }8dB (10kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness 1 + 9dB (50Hz), +3dB (10kHz)
Loudness 2 + 9dB (50Hz), +6dB (10kHz)
Bass boost 1 +10dB(50Hz)
Bass boost 2 +11dB(50Hz)
Power dissipation 160W
Dimensions Width 430x height 135x depth of 365mm
Weight 10.5kg