Audio Database


SANSUI AU-alpha 707DR
150,000yen(1991 release)

The Integrated Amplifier which filled the simple body with the technology of the SANSUI and was completed.

The amplifying circuit of amplifier was made to become independent of a grounding circuitry, and also the epoch-making Advanced alpha-X balance circuitry of loading of NM-LAPT is adopted.
+ It is a speaker by the Advanced alpha-X balance circuitry of 4 amplifier stream-compositions push pull scheme which equipped the side and - side with amplifier + - It is driving from both.
Moreover, NM-LAPT developed only in the audio lowers the impedance of a circuitry, and is raising the dynamic frequency characteristic.

The powering which adopted the NEW alpha-X balance power-source part of the closed-loop stream composition which carried a full load of high-quality sound component partses, such as a custom-made electrolytic capacitor, power transformer, etc., and was stabilized has been obtained.

An oscillation of a power supply system and a signal system is effectively controlled by the strengthening twin monophonic construction which maintained the optimal weight balance,Between the volumes and chassis which all the music signals pass etc. introduces an isorated mechanical feedback into the path which transmits an oscillation, and the vibration suppression by the isolation part of pure-copper material is given.

A music signal begins the fraction passed directly and the insulator of oscillating-component powder and a non-resonating design etc. is also pursuing the quality of each part thoroughly.

The power amplifier direct which can be inputted is direct carried for the audio signal to the power amplifier part.

A compact disk player is set to a power amplifier direct, and the back sound recording of compact disk or other sources is made into listening. For example, it is possible to back-record the sources, such as compact disk inputted in Normal 2, playing the source in Normal 1.

The 6-unit Detent volume, the gilding input terminal, the large-sized speaker terminal, and the polar window power cord / AC outlet are carried.

Internal A

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
6ohm: 160W+160W
8ohm: 130W+130W
THD (at the time of an effective output) 0.003% or less (8ohm)
Frequency characteristic (1W) DC-300kHz and +0 -3dB
Cross modulation distortion 0.003% or less (8ohm)
Dumping factor 150 (8ohm)
Input sensitivity/impedance 1V / 5kohm (1kHz)
SN ratio (A network) 120dB or more
Dynamic power 2ohm: 405W
4ohm: 320W
6ohm: 210W
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 200v/microsec
Rise time 0.5microsec
<Pre part>
Input sensitivity/impedance
Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape/DAT1-2-3:150mV /, 20kohm
Phono maximum permissible input MM(THD 0.01%):210mV
MC(THD 0.1%):21mV
the frequency characteristic (1W) Phono man month: 20Hz - 20000Hz, ±0.2dB
compact disk, Tuner, Line, Tape/DAT-1, 2 and 3:DC-200kHz, and +0 -3 dB
SN ratio (A network) Phono man month: 88dB or more
Phono MC: 70dB or more
compact disk, Tuner, Line, Tape/DAT-1, 2-3:110dB or more
Tone control The BASS maximum variation: ±6dB (50Hz)
The TREBLE maximum variation: ±6dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness 50Hz:+4dB
Power dissipation 330W
Dimensions Width 460x height 159x depth of 446mm
Weight 22.5kg