Accuphase A-48S Class-A Stereo Power Amplifier

Accuphase A-48 Class-A Stereo Power Amplifier

Accuphase A-48S Class-A Stereo Power Amplifier

Name: Accuphase A-48S Class-A Stereo Power Amplifier
Brand: Accuphase
SKU: ACCA48S
Availability: OutOfStock

Product variants

Pure Power, Refined Performance

The Accuphase A-48 is a powerhouse amplifier designed to deliver exceptional performance in high-end audio systems. With its robust construction and advanced circuitry, the A-48 offers a level of control and authority that is second to none.

At the heart of the A-48 lies a fully balanced Class-A amplifier circuit, ensuring exceptional linearity and low distortion. The amplifier's power supply is meticulously designed to provide clean, stable energy, even during demanding listening sessions. The result is a sound that is both powerful and refined, capable of driving even the most demanding speakers with ease.

Availability

Specifications

Continuous Average Output Power (20–20,000 Hz): Stereo operation (both channels driven) - 400 watts per channel into 1 ohm, 200 watts per channel into 2 ohms, 100 watts per channel into 4 ohms, 50 watts per channel into 8 ohms. Monophonic operation (bridged connection) - 800 watts into 2 ohms, 400 watts into 4 ohms, 200 watts into 8 ohms.

Total Harmonic Distortion: Stereo operation (both channels driven) - 0.05% with 2 ohm load, 0.03% with 4 to 16 ohm load. Monophonic operation (bridged connection) - 0.05% with 4 to 16 ohm load

Intermodulation Distortion: 0.01%

Frequency Response: At rated output: 20 – 20,000 Hz +0, -0.2 dB. At 1 watt output: 0.5 – 160,000 Hz +0, -3.0 dB

Gain: 28.0 dB (with GAIN selector at MAX) (Stereo and monophonic operation)

Gain Selection: MAX, -3 dB, -6 dB, -12 dB

Output Load impedance: Stereo operation - 2 to 16 ohms. Monophonic operation: 4 to 16 ohms

Damping Factor: 1000

Input Impedance: Balanced - 40 kilohms. Line - 20 kilohms

Signal-to-Noise Ratio (A-weighted, input shorted): 118 dB (GAIN selector at MAX), 123 dB (GAIN selector at -12 dB) At rated continuous average output

Output Level Meters: -60 dB to +3 dB (indication in dB and %) Logarithmic scale. Operation selector: OFF / NORMAL / HOLD (∞). Meter sensitivity selector (-20 dB). ＊Monophonic operation: same value displayed for left/right.

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

Power Consumption: 200 watts idle.

Maximum Dimensions: Width 465 mm, Height 211 mm, Depth 464 mm

Mass: 34.8kg

The A-48S incorporates state-of-the-art technologies to create a Class A power amplifier that delivers superb performance. Benefitting from years of ideal designs of high-performance units, the A-48S utilizes 6-parallel pull-push power MOS-FETs and boasts an output of 50 W into 8 ohms, 100 W into 4 ohms, 200 W into 2 ohms, and 400 W into 1 ohm at the same size as conventional models. The noise level has also been further reduced by 6%, while providing a damping factor of 1,000. The A-48S will bring the best out of any speaker, enabling you to enjoy unparalleled sound quality and expansiveness.

Features

Class-A power output: 50W/8Ω, with up to 400W/1Ω for dynamic and demanding music passages.
6-parallel MOS-FET output stages for stable, distortion-free power across various speaker loads.
Ultra-low noise with an S/N ratio of 118dB, ensuring a crystal-clear and detailed soundstage.
Super high damping factor of 1000, allowing for precise control of speaker drivers and delivering tight, controlled bass.
Comprehensive protection systems, including short-circuit protection and temperature sensors, ensuring long-term reliability and safety.

At Soundline, we believe that Accuphase products offer high-end performance without an eye-watering price tag. The A-48S delivers exceptional sound quality, build integrity, and reliability, making it an ideal choice for audiophiles seeking performance that lasts.

To learn more about the Accuphase A-48 or to schedule a demonstration, please contact us.

Who is this for?

The Accuphase A-48S is designed for serious audiophiles building a reference-level separates system who want the purity of Class-A amplification with genuine loudspeaker-driving authority. It suits listeners who already have a high-quality preamplifier and revealing loudspeakers, and are looking for a power amplifier that elevates control, resolution, and musical realism.

This amplifier is particularly well suited to medium to large listening rooms where scale, dynamics, and soundstage depth matter. It pairs effortlessly with demanding loudspeakers that benefit from high current delivery and absolute stability, bringing a sense of grip and refinement that allows music to unfold naturally at any volume.

The A-48S is ideal for listeners who prioritise tonal richness, low-level detail, and long-term listening comfort over raw measurement-driven performance. Its Class-A design delivers a smooth, continuous flow to music that makes even complex recordings feel relaxed, coherent, and deeply engaging.

For those upgrading from integrated amplification or stepping into a fully separate high-end system, the A-48S represents a long-term reference power amplifier—built for purity, control, and the kind of effortless musical delivery that defines true high-end Class-A design.