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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.

Accuphase A-48S
Accuphase A-48S. Image source - (c) Accuphase

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.

Accuphase A-48S
Accuphase A-48S. Image source - (c) Accuphase

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.

Accuphase A-48S
Accuphase A-48S. Image source - (c) Accuphase

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

Accuphase A-48S
Accuphase A-48S. Image source - (c) Accuphase

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