SANSUI AU-405

Commentary

This DC integrated amplifier is equipped with a pure non-NF circuit to support next-generation audio.

It is equipped with a newly developed pure non-NF circuit to drive the speakers more dynamically.
In this circuit, the output stage is not affected by negative feedback (NF) and the current required for the speaker drive the speaker drive can be supplied more smoothly, and the current response is improved to realize a more faithful speaker drive.

By adopting a DC amplifier configuration, sound quality is not affected by the condenser in the signal path, and the time constant in the low-frequency range is reduced, enabling wide-range playback.

The power supply section uses a power transformer with high-density filler for enhanced vibration and heat resistance, and an audio electrolytic capacitor with excellent charging and discharging speed.
In addition, as a measure against vibration, we have adopted a strap mount method in which the power transformer is hung upside down from the upper part of the body to prevent vibration transmission by utilizing the self-weight of the transformer.

Uses non-magnetic parts and parts with improved anti-vibration performance.

Equipped with 4-mode presence control, Loudness 1 and 2 raises both high and low frequencies simultaneously, and Bus Boost 1 and 2 raises only low frequencies, which are often lacking in small speakers.

Model Rating

Type	Integrated amplifier
Effective power (20 Hz to 20 kHz, simultaneous operation for both channels)	80W + 80W (6 Ω) 60W + 60W (8 Ω)
Total harmonic distortion factor	0.07% or Less (8 Ω, 20 Hz to 20 kHz, Effective Output)
Mixed harmonic distortion factor	0.07% or Less (8 Ω, Effective Output, 60 Hz : 7 kHz = 4 : 1, SMPTE Method)
Input Sensitivity / Input Impedance (1kHz)	Phono MC : 300 μ V/100 Ω Phono MM : 2.5mV/47k Ω CD, Tuner, DVD Audio/Line, MD/Tape-1, 2 : 150mV/4.7k Ω
Maximum allowable input (1 kHz, 0.01% THD)	Phono MC:25mV Phono MM:210mV
Dynamic Power	280W (2 Ω) 180W (4 Ω) 130W (6 Ω)
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.5 dB CD, Tuner, DVD Audio/Line, MD/Tape1, 2 : DC ~ 200 kHz + 0 dB, -3dB
Signal-to-noise ratio (A network Short circuit)	Phono MC : 70 dB or more Phono MM : 88 dB or more CD, Tuner, DVD Audio/Line, MD/Tape1, 2 : 110 dB or higher
Tone control	Maximum variation of Bass : ± 8 dB (50 Hz) Maximum variation of Treble : ± 8 dB at 10 kHz
Subsonic filter	16 Hz (-3dB), 6dB/oct.
Power consumption	160W (rated) 30W (No Signal)
External dimensions	Width 430x Height 136x Depth 365 mm
Weight	10.5kg