Audio Database

The

SANSUI AU-405
53,000yen(1999 release)

Description
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DC integrated amplifier which aimed at the correspondence to a next-generation audio by carrying a Pure Non NF circuitry.

In order to drive a speaker to a dynamic more, the newly developed Pure Non NF circuitry is carried.
In this circuitry, the electric current required for a speaker drive could be supplied more to the smooth, the response of the electric current improved, without an output stage receiving the influence by NF (Negative Feedback), and the more faithful speaker drive is realized.

By adopting DC amplifier stream composition, influence on the tone quality by the capacitor of a signal path is not received, but a low-pass time constant is reduced, and the wide-range play is enabled.

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

The part which aimed at non-magnetic-material-izing of each part and the improvement in a vibration proof performance is adopted.

The presence control in the 4 modes is carried. In a loudness 1-2, it raises a high region and low-pass simultaneously. Moreover, in the base boost 1-2, it raises low-pass.

NF Strap

Rating of a mode
Form Integrated amplifier
Effective output
(20Hz - 20kHz, both channel simultaneous operation)
80W+80W (6ohm)
60W+60W (8ohm)
THD 0.07% or less (at the time of 8 ohm, 20Hz - 20kHz, and an effective output)
Cross modulation wave distortion 0.07% or less (at 8 ohm, the time of an effective output 60Hz:7kHz=4:1, the SMPTE method)
Input sensitivity/input impedance
(1kHz)
Phono MC: 300 microvolts/100 ohms
Phono man month: 2.5mV / 47kohm
compact disk, Tuner, DVD-Audio/Line, micro disk/Tape-1 or 2:150mV /, 4.7kohm
Maximum permissible input
(1kHz, THD 0.01%)
Phono MC:25mV
Phono MM:210mV
Dynamic power 280W (2ohm)
180W (4ohm)
130W (6ohm)
Frequency characteristic Phono man month: 20Hz-20kHz}0.5dB
compact disk, Tuner, DVD-Audio/Line, micro disk/Tape1, 2
: DC-200kHz+0dB, -3dB
SN ratio (A network)
Short circuit
Phono MC: 70dB or more
Phono man month: 88dB or more
compact disk, Tuner, DVD-Audio/Line, micro disk/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
Power consumption 160W (rate)
30W (at the time of a non-signal)
Dimensions Width 430x height 136x depth of 365mm
Weight 10.5kg