Accuphase A-48S – Current Feedback Topology Amplifier
06.03.2025 06:21 | ~1 minute read
The current feedback amplification topology and powerful power supply of the new Accuphase A-48S amplifier provides a large reserve and stable output in pure Class A. For a load with an impedance of 8 ohms, 50 watts are available, and halving the load impedance doubles the output power. With a short-term drop in load impedance to 1 ohm, the amplifier is capable of delivering a power of 400 watts.
The Accuphase A-48S stereo power amplifier replaces the A-48 in the company's lineup. The basic design is essentially the same, but the Accuphase A-48S provides 5 watts more power than the A-48. The damping factor has increased by 25% to 1,000 units, and the noise level has decreased by six percent to 25.2 µV.
The Accuphase A-48S power amplifier output stages employ six power transistors operating in parallel in push-pull mode. This design reduces output impedance, improving the amplifier's ability to control loudspeakers while reducing the load on the transistors.
The Accuphase A-48S stereo power amplifier is now available for sale at a suggested retail price of $12,500.
Specifications
This product is in the Hi-Fi and High End Electronics and Acoustics database
Power amplifiers stereo — Accuphase A-48S
Model name
A-48S
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
2 x 50
Output power (4Ω) (W)
2 x 100
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
0.5
Frequency response high +/- 3dB (Hz)
160000
Signal to Noise Ratio (dB)
N/A
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
N/A
Max power consumption (W)
N/A
Damping factor
1000
Dimensions (mm)
465 x 211 x 464
Weight (kg)
34.8
Official link
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