|SANSUI AU-alpha 707XR
The Integrated Amplifier which carries the newly
developed Hyper alpha-X balance circuitry.
In order to remove distortion
generated by the asymmetry of the element, the Hyper alpha-X balance circuitry
on the basis of the original technology of X balance amplifier is developed and
In addition to the conventional balance circuitry, this circuitry
newly introduced the high CMRR type constant current circuit into the first rank
of the power amplifier and preamplifier which determine the dynamic behavior of
amplifier, and has realized the with a theoretical value of 140dB modification
effect by CMRR. Thereby, the asymmetry of an element suppresses the variation in
the electric current by DC offset of a cause, and is stopping the dynamic noise
generated in a circuitry.
Moreover, it was made the balance justice to which
a transmit and amplification of a music signal can perform a whole page
simultaneously, and the ill effect by the reverse electromotive style and
exogenous noise of a speaker is eliminated by carrying out the full separation
of an amplifying circuit and the grounding circuitry.
Furthermore, amplifier for exclusive use was put on each by the side of
+ of an output, and -, and the push pull scheme which drives a speaker
on these requirements with a total of four amplifier is adopted.
NM-LAPT which is a device only for
an audio was carried in the power stage, and the outstanding RF property and
electric-current threshold value are acquired.
The whole page is
considered as DC amplifier stream composition from the input to the output.
Furthermore, the NEW diamond differential circuit which can take out the
output by the side of - without phase inversion is adopted, the responsibility
over a momentary signal is improved, and the performance of DC amplifier is
improved by suppressing an occurrence of TIM distortion.
tone-quality failure which takes place in the case of the interconnection with
the external equipment which makes FET of the first rank cascade connection and
differs a circuitry in an impedance in order to high-speed-ize, a wide range and
In order to prevent imbalanced-ization of a power source in
a power-source part, while supplying the large current which adopted the
closed-loop stream composition which made the power-source part become
independent of a grounding, had also separated particularlies, such as a power
stage and a voltage amplification stage, completely, and was stabilized,The
signal is protected from the noise generated at the time of the natural
oscillation and charge and discharge of a power-source part.
In order to
prevent the oscillation generated from a power supply system or a signal system,
the strengthening twin monophonic construction is adopted.
large-sized transformer and the electrolytic capacitor were installed in the
central part, and also the power unit which consists of signals systems, such as
a power transistor and a radiator, was placed symmetrically, and the optimal
weight balance is secured.
Moreover, the isorated mechanical feedback which
is an original technology is introduced,Pure-copper material, a Teflon sheet, and a Teflon tapes are utilized for the roots on which an oscillation is
transmitted, such as between a master volume, between chassis and a transformer,
between chassis and NM-LAPT, and radiators, and the oscillation is effectively
suppressed on them.
Furthermore, the extraneous vibration is intercepted by
the ellipse insulator of a special structure.
The power amplifier direct
input which can input the music signal of the digital source into a direct power
amplifier part, and the balance input terminal are carried.
Detent volume is adopted as a volume.
The source power direct, an REC
serector, an AC outlet, etc. are carried.
|<Power amplifier part>
|Effective output (10Hz - 20kHz)
Both channel simultaneous operation
|THD (at the time of an effective output)
||0.003% or less (8ohm)
|Cross modulation distortion
||0.003% or less (8ohm)
|Frequency characteristic (1W)
||1V / 5kohm (1kHz)
|SN ratio (A network)
||120dB or more
|TIM distortion (SAWTOOTH)
||Below a limit-of-measurement value
|Phono man month: 2.5mV / 47kohm
MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape/DAT1, 2:150mV /
|Phono maximum permissible input
|the frequency characteristic (1W)
||Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, and 2:DC-200kHz+0 -3 dB
|SN ratio (A network)
||Phono man month: 88dB or more
70dB or more
compact disk, TUner, Line, Tape/DAT1, 2:110dB or more
||The Bass maximum variation: }6dB (50Hz)
The Treble maximum variation: }6dB (15kHz)
||16Hz (-3dB), 6dB / oct
||Width 466x height 162x depth of 452mm