One of the all time great amplifiers

Pioneer‘s A400 was so good that subsequent models never really recaptured its essence. With the A 400 apt at producing excellent detail, agility and dynamics, it left rivals scratching their heads as their own attempts to match the Pioneer left them floundering.

Even flanked by high-end sources and speakers, the A 400 rose to the occasion

What the press said:

“There is something ineffably right about the Pioneer A400.” Andrew Gold, What Hi Fi?

“It loves music, the A400.” “It loves it with a vengeance.” Mark Payton, High Fidelity Magazine

“Even if your budget extends to £1000, it could be exactly what you are after” Jimmy Hughes, Audiophile

“As good as amps costing up to a thousand pounds.” Hi Fi Choice

“Best Amplifier”, “Best Buy Overall”, “Product of the Year” What Hi-fi?

“Best Amplifier” Hi Fi Choice

Specifications

Pioneer A-400 technical specification:

EE design by Tadao Yoshida

Technology employed from the Pioneer C-Z1
Super Linear Circuit (SLC)
Clean Ground System (CGS)

DIN Continuous power output (both channels driven at 1 kHz)
85W + 85W into 4 Ohms. 1% THD
60W + 60W into 8 Ohms. 1% THD

Continuous power output (both channels driven at 20 Hz to 20kHz)
70W + 70W 4 Ohms, 0.05% THD
50W + 50W 8 Ohms, 0.03% THD

Dynamic power output (on EIA dynamic test signal)
135W/100W/70W into 2 Ohms /4 Ohms /8 Ohms

Damping Factor: 130 (20Hz – 20kHz)

Total Harmonic Distortion
0.03% at 20Hz-20kHz , 50 W, 8 Ohms
0.05% at 20Hz-20kHz , 70 W, 4 Ohms

Frequency Response
5Hz-100 kHz + 0/- 3 dB (CD, Tuner, Aux, Tape)
20Hz-20 kHz +/- 0.3 dB (Phono MM)
20Hz-20 kHz +/- 0.5 dB (Phono MC)

Signal-to-Noise ratio (IHF short circuit, A network)
108 dB (CD, Tuner, Aux, Tape)
87 dB / 69 dB (Phono MM, 2.5 mV input, Phono MC, 0.2 mV input)

Signal-to-Noise ratio (DIN, continuous power/50 mW)
88 dB / 65 dB (CD, Tuner, Aux, Tape)
74 dB / 63 dB (Phono MM)

Input sensitivity/impedance
CD, Tuner, Aux, Tape: 150mV/ 50 kOhms
Phono (MM): 2.5mV/ 50 kOhms
Phono (MC): 0.2mV/ 100 kOhms

Power supply: 240V AC, 50/60 Hz
Power consumption: 520 Watts

Dimensions:420(W)x352(D)x126(H)mm
Weight: 8 kg / 9.9 oz (17.621 lb)