Audio Database

AU - α 507i
Commentary

This pre-main amplifier realizes low impedance load drive capability of up to 2 Ω by mounting a strong power stage and power supply.

The power supply section is equipped with a heavyweight power transformer and a dedicated audio capacitor.

Equipped with a source direct function, all input sources can be transmitted to the power amplifier in the shortest distance after passing the accessory circuit.

Equipped with tone control equipped with defeat function.

The chassis is a solid chassis with sufficient consideration for vibration resistance and shielding characteristics, eliminating the influence of unnecessary noise and electromagnetic wave noise.

The REC selector allows you to disconnect the recording input / output circuit from the main signal path when the recording or dubbing function is not used.

Equipped with a MM/MC switching phono equalizer.

Uses a power cord with polarity display.

Equipped with a subsonic filter.

Model Rating
Type Integrated DC amplifier
Power Amplifier Unit
Effective output (10 Hz to 20 kHz, both channels driven) 90W + 90W (6 Ω)
80W + 80W (8 Ω)
Total harmonic distortion factor (at effective output) 0.005% or Less (8 Ω)
Cross modulation distortion factor Not more than 0.005%
Damping factor 100 (8 Ω)
TIM (SAWTOOTH) Below the measurement limit
Preamplifier Section
Input Sensitivity / Impedance (1 kHz) Phono MM : 2.5mV/47k Ω
Phono MC : 300 μ V/100 Ω
Tuner, CD, Line, Tape Play : 150mV/47k Ω
Phono maximum allowable input MM:210mV(THD 0.01%)
MC:25mV(THD 0.08%)
Frequency characteristic Phono MM : 20 Hz to 20 kHz ± 0.2 dB
CD, Line, Tape Play : 1 hz to 200 khz + 0 db -3dB
Signal-to-noise ratio Phono MM : 83 dB or more
Phono MC : 70 dB or more
Tuner, Line, CD, Tape Play : 110 dB or higher
Tone control Maximum variation of Bass : ± 8 dB (100 Hz)
Maximum variation of Treble : ± 8 dB at 10 kHz
Subsonic filter 16 Hz (-3dB, 6dB/oct.)
<General>
Rated power consumption 175W
External dimensions Width 448x Height 135x Depth 370 mm
Weight 10.8kg