Accuphase A80 Bloc de puissance Stéréo Pure Classe A

ACCUPHASE A80 est un bloc de puissance stéréo en pure Classe A. Il délivre une puissance de 2 x 65 WRMS sous 8 Ohm, 2 x 130 WRMS sous 4 Ohm, 2 x 260 WRMS sous 2 Ohm et même 2 x 520 WRMS sous 1 Ohm. Ces chiffres montrent clairement que l'alimentation, très généreuse, sera toujours disponible pour toutes les configurations d'écoute, même à fort niveau, même avec des enceintes difficiles.

En mode bridgé, le A80 délivre 260 WRMS sous 8 Ohm, 520 WRMS sous 4 Ohm et 1040 WRMS sous 2 Ohm. Soulignons également l'excellent facteur d'amortissement de 1000 (ou plus, selon la formule d'Accuphase).

Idéalement couplé au préampli C2900, le A80 constitue l'une des meilleures solutions d'amplification de tous les temps.

Caractéristiques constructeur :

• Class A driven 10-parallel push-pull MOS-FET output stage
• 65 W into 8 ohms, 130 W into 4 ohms, 260 W into 2 ohms, and 520 W into 1 ohm large linear output power
• Instrumentation amplifier
• Current feedback amplification topology
• Balanced remote sensing
• MCS+ circuitry
• High damping factor of 1,000
• Meter display switching
• Digital power meter display switching
• Hold time switching function that changes the meter peak display time
• LINE / BALANCED input switching
• 4-step gain control
• Polarity switching of balanced input connectors
• Bi-amping connection and bridged connection switching
• Signal input section with a fully discrete configuration for low noise
• Speaker output protection circuit guards against short-circuiting
• Large speaker terminals connected directly to protection circuitry
• Edgewise coils improve damping factor
• Highly reliable MOS-FET switches with no mechanical connections
• Large, high-efficiency toroidal transformer
• High capacity 120,000 μF filtering capacitors
• Aluminum hairline finish top plate
• Highly responsive large-scale bar graph meters and digital power meters
• High-carbon cast iron insulator feet with superior damping characteristics
• Power amplification section on circuit boards using glass cloth fluorocarbon resin

Rated Output (20 – 20,000 Hz) Load 8 ohms / 4 ohms / 2 ohms / 1 ohm
Normal / Bi-amping connection : 65 W / 130 W＊ / 260 W＊ / 520 W＊
Bridged connection : 260 W＊ 520 W＊ 1,040 W＊ ー
(＊: Limited to music signals)

Total Harmonic Distortion (20 – 20,000 Hz, At rated output)
Normal / Bi-amping connection : 2 ohms 0.07 % / 4 to 16 ohms 0.03 %
Bridged connection : 4 to 16 ohms 0.05 %

Intermodulation Distortion
0.01 %

Frequency Response
At rated output : 20 – 20,000 Hz (+0, –0.2 dB)
At 1 W output : 0.5 – 160,000 Hz (+0, –3.0 dB)

Damping Factor
1000 or greater

Input Impedance
BALANCED input : 40 kilohms
LINE input : 20 kilohms

Input Sensitivity At rated output / At 1 W output
Normal / Bi-amping connection : 0.91 V / 0.11 V
Bridged connection : 1.82 V / 0.11 V

Signal-to-Noise Ratio (A-weighted, input shorted)
Gain switch at MAX / –12 dB  : 123 dB / 129 dB

Gain
Gain switch @ MAX / -3dB / -6dB / -12dB
Normal / Bi-amping connection : 28dB / 25dB / 22dB / 16dB

Power Meters
Format Logarithmic scale, with illumination off switch
Display range -∞ ~ +3 dB
Hold time 1 sec. / ∞ switchable

Power Requirements
120/220/230 V AC, 50/60 Hz
(Voltage as indicated on rear panel)

Power Consumption
Idle : 211 W
In accordance with IEC 62368-1 : 260 W
Stand-by : 0.3 W

Maximum Dimensions
Width 465 mm (18.3”)
Height 240 mm (9.4”)
Depth 515 mm (20.3”)

Mass
Net : 44.6 kg (98.4 lbs)
In shipping Carton : 54 kg (119 lbs)

What's in the box
AC power cord