Audio Database

Image of A-580
Commentary

This pre-main amplifier uses a non-switching circuit for more beautiful and natural sound.

Pioneer's original non-switching circuit is used in the power amplifier section to suppress switching distortion.
In addition, a multiple differential feedback loop (Nested Feedback Loops) devised by Professor Cherry of the University of Monash, Australia (at that time) is employed to realize a low distortion factor over a wide bandwidth.

All stages are equipped with a non-coupling capacitor by adopting a DC servo circuit, and a line straight function that sends signals directly from the equalizer section to the power section. These features are designed to ensure sound purity.

Model Rating
Type Pre-main amplifier
Effective power 70W + 70W (20 Hz to 20 kHz, double-channel drive, 8 Ω)
Harmonic distortion factor
(20 Hz to 20 kHz)
0.005% (at effective output)
0.005% (8 Ω at 35W output)
Frequency characteristic Phono MM : 20 Hz to 20 kHz ± 0.2 dB
Tuner, Aux, Tape Play : 5 hz to 100 khz + 0 to 3 db
Signal-to-noise ratio (IHF, A-network
Short circuit)
Phono MM:89dB
Phono MC:72dB
Tuner, AUX, Tape Play : 110 dB
Power supply voltage 100 VAC, 50Hz/60Hz (Electrical Appliance and Material Control Law)
Power consumption 160W
External dimensions Width 420x Height 98x Depth 367 mm
Weight 7.6kg