Accuphase A48S Bloc de puissance Classe A

ACCUPHASE A48S est un bloc de puissance en pure Classe A. Il délivre 2 x 50 WRMS sous 8 Ohm, 2 x 100 WRMS sous 4 Ohms, 2 x 200 WRMS sous 2 Ohms et 2 x 400 WRMS sous 1 Ohm. Ces chiffres un peu abstraits démontrent que l'alimentation du A48S ne sera jamais prise de court, même à fort niveau, même avec des enceintes exigeantes. Il est bridgeable en mono pour obtenir une puissance de 200 WRMS sous 8 Ohm et 400 WRMS sous 4 Ohm. Idéalement couplé au préampli Accuphase C2300, il constitue une extraordinaire solution d'amplification de très haut de gamme.

Caractéristiques constructeur :

• Class A driven 6-parallel push-pull MOS-FET output stage
• Large linear output of 50 W / 8 ohms, 100 W / 4 ohms, 200 W / 2 ohms, 400 W / 1 ohm
• Instrumentation amplifier
• Current feedback amplification topology
• Balanced remote sensing
• MCS+ circuitry
• Large, high-efficiency toroidal transformer
• High capacity 68,000 μF filtering capacitors
• Large speaker terminals connected directly to protection circuitry
• Protection circuitry using MOS-FET switches
• High damping factor of 1,000
• Large, high-sensitivity power meters ranging from –50 dB
• Bi-amping connection and bridged connection switching
• Speaker output protection circuit guards against short-circuiting
• Aluminum hairline finish top plate
• High-carbon cast iron insulator feet with superior damping characteristics

Rated Output (20 – 20,000 Hz) Load 8 ohms 4 ohms 2 ohms 1 ohm
Normal / Bi-amping connection 50 W 100 W＊ 200 W＊ 400 W＊
Bridged connection 200 W＊ 400 W＊ 800 W＊
(＊: Limited to music signals)

Total Harmonic Distortion (20 – 20,000 Hz, at rated output)
Normal / Bi-amping connection 2 ohms 0.05% 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 dB)

Damping Factor Normal / Bi-amping connection
1000

Input Impedance
BALANCED : 40 kilohms
LINE input : 20 kilohms

Input Sensitivity Output At rated output / At 1 W output
Normal / Bi-amping connection 0.80 V / 0.11 V
Bridged connection 1.59 V / 0.11 V

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

Gain @ switch MAX / –3 dB / –6 dB / –12 dB
28 dB / 25 dB / 22 dB / 16 dB

Power Meters
Format Logarithmic scale, with illumination Off switch
Display range : –∞ to +3 dB
Hold time : 0 sec /  3 sec /  ∞ switchable

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

Power Consumption
Idle : 200 W
In accordance with IEC62368-1 : 220 W
Standby : 0.3 W

Maximum Dimensions
Width 465 mm (18.3”)
Height 211 mm (8.3”)
Depth 464 mm (18.3”)

Mass
Net : 34.8 kg
In shipping carton : 41 kg

The measurement methods for the Guaranteed Specifications comply with JEITA CP-1301A and IEC 60268-3
“Normal connection” indicates standard operation

What's in the box
AC power cord(2 m (6.5')