Audio Database

The

SANSUI AU-alpha 999DG
135,000yen(around the 1989 time)

Description
@
The Integrated Amplifier which carries the NEW linear & direct D/A combartion system developed based on the MASH scheme.

A MASH scheme is a D-A-conversion scheme made into the criteria of a translation of the frequency by a crystal oscillator,By high order oversampling and the 3rd noise shaping, a digital signal is changed into an analog signal highly precise in an instant, and the occurrence of zero cross distortion or non-linear distortion has the special feature of not occurring theoretically.
Since it is compatible in the high precision of a MASH scheme, and flexibility suitable in integrated amplifier in AU-alpha 999DG,The precision near a crystal oscillator is offered, and also a lock range adopts a large LT element, and it is considered as the original linear & direct D/A combartion system (L. D.C.S).
In New L.D.C.S, total upgrade is aimed at from an off-site circuitry, and the SN ratio is improved further.

In the power-source part, in order to put a digital part and an analog part into practice and to dissociate, the transformer for exclusive use is carried in digital one/analog circuit, respectively.
Furthermore, the mass transformer was begun in the analog system, the 64phi high-performance low scaling-factor electrolytic capacitor was adopted, and while forming a musical basic fraction, the low-pass elongation is secured.

The balance circuitry on the basis of a grounding was adopted as the amplifier part, and the alpha-X balance circuit which poured in the original know-how is adopted as it. In the circuitry itself, this circuitry has canceled a noise and distortion by balance operation.
Furthermore, - and + side enables the low distortion play by becoming + and a push pull scheme driven on the same requirements from the bothways of - by 4 amplifier stream compositions with exclusive amplifier.

The power-source part was placed in the center and the twin monophonic construction which arranges a power unit symmetrically is adopted. Since a digital circuit part is shielded and arranged on the outside of the left channel unit and also an analog input part is shielded and arranged by this on the outside of the right channel unit, the digital part and the analog part are separated clearly.

The remote controller is attached and an input source changeover of up and down of a volume or 11 totals is possible by a listening position.

Functionalities, such as Source-Direct operation, an REC serector, and a direct-access rotary switch, are carried.

The gilding input terminal, the polar attached-indicator very-thick power cord, and the AC outlet are adopted.

Internal-electrical-power-source The
Digital Remote

Rating of a mode
Form Alpha-X balanced integrated amplifier
<Digital part>
Frequency characteristic 4Hz-20kHz}0.5dB
SN ratio 108dB or more (EIAJ)
THD 0.003% or less
Digital input level 0.5 Vp-p/75ohms
An optical input 660nm (light-generation wavelength)
<Power amplifier part>
Effective output (10Hz - 20kHz, both channel drive) 110W+110W (6ohms)
95W+95W (8ohms)
Dynamic power 280W (2ohms)
220W (4ohms)
155W (6ohms)
THD (at the time of an effective output) 0.003% or less (8ohms)
Cross modulation distortion 0.003% or less (8ohms)
Dumping factor 150 (8ohms)
Frequency characteristic (1W) DC-200kHz+0 -3dB
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 180v/microsec
Rise time 0.6microsec
<Preamplifier part>
Input sensitivity/impedance (1kHz) Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:150mV / 20kohm
Phono maximum permissible input MM(THD 0.01%):210mV
MC(THD 0.1%):21mV
Frequency characteristic Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, 2, and 3:DC-200kHz+0 -3 dB
SN ratio Phono man month: 88dB or more
Phono MC: 70dB or more
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:110dB or more
Tone control Bass: }6dB (50Hz)
Treble: }6dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness + 6dB (50Hz), +4dB (10kHz)
<Synthesis>
Power dissipation 250W
Dimensions Width 468x height 163x depth of 450mm
Weight 19.6kg
Adjunct Wireless remote control RS-1130