SANSUI AU - α 999 dg

Commentary

This pre-main amplifier is equipped with the NEW linear & direct D/A conversion system developed based on the Mash system.

The Mash method is a D/A conversion method that uses the frequencies of a crystal oscillator as the conversion standard. It uses high-order oversampling and third order noise-shaping to instantaneously convert digital signals into high-precision analog signals, and has the feature that 0 cross distortion and nonlinear distortion do not occur in principle.
The AU-alpha 999 dg is a unique linear & direct D/A conversion system (L. D. C. S) with the accuracy close to that of a crystal oscillator and the adoption of a lithium tantalate device with a wide lock range in order to combine the high accuracy of the Mash system with the flexibility suitable for an integrated amplifier.
New L. l. D. C. S, the SN ratio has been further improved by total upgrading from peripheral circuits.

In order to completely separate the digital and analog sections of the power supply section, a dedicated transformer is installed for each digital and analog circuit.
In addition, the analog system uses a 64 φ high-performance low-power electrolytic capacitor as well as a high-capacity transformer to ensure the expansion of the middle and low band that forms the basic part of music.

The amplifier section uses a balanced circuit that does not use earth as a reference, and an α -X balanced circuit that is based on our unique know-how. The circuit itself cancels noise and distortion by the balance operation.
In addition, a 4-amp configuration with dedicated amplifiers on the - and + sides provides a push-pull system that drives under the same conditions from both + and - sides, enabling playback at a low distortion rate.

A twin monaural construction with the power supply in the center and the power units symmetrically arranged ensures that the digital section to be shielded outside the left channel unit and the analog input section to be shielded outside the right channel unit so that the digital and analog sections are clearly separated.

Equipped with a remote controller, volume Up down and total 11 input source switching can be performed in listening position.

It is equipped with functions such as source direct operation, REC selector and direct access rotary switch.

Uses gold-plated input terminal, very thick power cord with polarity display, and AC outlet.

Model Rating

Type	Α -X Balanced Integrated Amplifier
Digital Part
Frequency characteristic	4 Hz to 20 kHz ± 0.5 dB
Signal-to-noise ratio	108 dB or more (EIAJ)
Harmonic distortion factor	Not more than 0.003%
Digital input level	0.5Vp-p/75 Ω
Optical input	660 nm (emission wavelength)
Power Amplifier Unit
Effective output (10 Hz to 20 kHz, both channels driven)	110W + 110W (6 Ω) 95W + 95W (8 Ω)
Dynamic Power	280W (2 Ω) 220W (4 Ω) 155W (6 Ω)
Total harmonic distortion factor (at effective output)	0.003% or Less (8 Ω)
Cross modulation distortion factor	0.003% or Less (8 Ω)
Damping factor	150 (8 Ω)
Frequency Response (1W)	DC ~ 200 khz + 0 -3dB
TIM (SAWTOOTH)	Measurement limit value or less
Slew rate	180 V / μ sec
Rise time	0.6 μ sec
Preamplifier Section
Input Sensitivity / Impedance (1 kHz)	Phono MM : 2.5mV/47k Ω Phono MC : 300 μ V/100 Ω CD, Tuner, Line, Tape/DAT1, 2, 3 : 150mV/20k Ω
Phono maximum allowable input	MM(THD 0.01%):210mV MC(THD 0.1%):21mV
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.2 dB CD, Tuner, Line, Tape/DAT1, 2, 3 : DC ~ 200 khz + 0 -3dB
Signal-to-noise ratio	Phono MM : 88 dB or more Phono MC : 70 dB or more CD, Tuner, Line, Tape/DAT1, 2, 3 : 110 dB or more
Tone control	Bass : ± 6 dB (50 Hz) Treble : ± 6 dB (15 kHz)
Subsonic filter	16 Hz (-3dB), 6dB/oct.
Loudness	+ 6 dB (50 Hz), + 4 dB (10 kHz)
<General>
Rated power consumption	250W
External dimensions	Width 468x Height 163x Depth 450 mm
Weight	19.6kg
Attachment	Wireless Remote Control RS 1130