Accuphase A-48 Stereo Class A Power Amplifier
Featuring a six-fold parallel push-pull architecture with power MOS-FETs, as well as ideal gain allocation realized with discrete semiconductors in an instrumentation amplifier configuration, the A-48 harnesses a wealth of advanced technology. Its outstanding performance is exemplified by a signal/noise ratio of 117 dB, output of 360 watts into 1 ohm (music signals), and a damping factor of 800. The newly designed output protection circuit can detect any short-circuiting of the speaker terminals, for complete peace of mind. This power amplifier is the ultimate instrument for immersive music appreciation on the highest level.
- Power MOS-FETs in 6-parallel push-pull configuration
- Linear output characteristics over entire load impedance range
- Strong power supply with massive toroidal transformer and large 60,000 μF filtering capacitors
- Instrumentation amplifier principle
- High-gain signal input section in discrete configuration
- Dedicated power supply for signal input section
- Polarity switching for balanced input connectors
- MCS+ circuit topologys
- Current feedback principle in amplification circuitry
- Protection circuitry using MOS-FET switches
- High damping factor of 800
- Speaker output protection circuit guards against short-circuiting
- Two sets of large speaker terminals
- 4-step gain control
- Support for bi-amping and bridged mode
- Aluminum top plate with hairline finish
Specs
Continuous average output power: 45 W / ch (8 ohms), 90 W / ch (4 ohms), 180 W / ch (2 ohms), 360 W / ch (1 ohm, music signal) / Bridged operation: 180 W (8 ohms), 360 W (4 ohms), 720 W (2 ohms, music signal)
Frequency response: 0.5 Hz – 160 kHz +0, -3.0 dB
IM distortion: 0.01% or less
Damping factor 800 (EIA, 8 ohm load, 50 Hz)
S / N ratio: 117 dB (GAIN: MAX), 122 dB (GAIN: -12 dB) (A weighted)
Rated input: 0.76 V