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Accuphase A-48S
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.
- 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
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Professional Reviews 87/100
Nicely Roasted
Sound Quality
86/100
Build Quality
91/100
Value for Money
85/100
The A-48S pairs silent, precise Class A sound with startling low-impedance control: its six-parallel MOS-FET stage doubles output from 50W into 8 ohms to 400W into 1 ohm. Best of High End highlights its reduced noise and 1,000 damping factor, while the toroidal supply and refined chassis underscore serious engineering for demanding loudspeakers.
What Reviewers Are Saying
Pros
Exceptionally low-noise, clear and precise presentation, supported by a 6% noise reduction and 1,000 damping factor.
Serious current delivery: output doubles from 50W/8Ω to 100W/4Ω, 200W/2Ω and 400W/1Ω for confident control of difficult speaker loads.
Robust premium construction, including a high-efficiency toroidal transformer, 68,000μF filtering capacitance and cast-iron insulator feet.
&
Cons
Available A-48S coverage offers limited direct listening detail on tonal character and soundstage scale.
SOUND QUALITY PERFORMANCE 86/100
The available coverage presents the A-48S as a notably quiet, precise Class A design, highlighting lower noise, high damping factor, and strong overall fidelity. Direct listening descriptions of tonal shading and spatial presentation are limited, but the review reports no sonic shortcomings.
Transparency Resolution
87/100
The review specifically links the reduced noise floor to clear, precise delivery of musical notes and nuances. Its description supports a clean, controlled presentation, though there is little direct discussion of fine-detail retrieval on familiar recordings.
Tonal Balance Musicality
85/100
The coverage broadly praises sound fidelity and describes the amplifier as designed for superior performance across speaker systems. It does not provide much detail about warmth, neutrality, timbre, or long-session musical character, and it identifies no tonal flaw.
Dynamics
89/100
Its Class A output stage is specified to supply 50W into 8 ohms, doubling to 100W into 4 ohms and continuing to 400W into 1 ohm. Along with the six-parallel MOS-FET output stage and damping factor of 1,000, this points to substantial current capability and speaker control, although the review offers limited listening-based commentary on transient impact.
Soundstage Imaging
83/100
The review's emphasis on low noise, clarity, and precision is encouraging for image stability and separation. However, it does not directly describe stage width, depth, layering, or image placement, so the spatial character is not fully documented.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
91/100
The A-48S uses a substantial high-efficiency toroidal transformer, 68,000µF of filtering capacitance, and a six-parallel push-pull MOS-FET output stage. Balanced remote sensing, MCS+ circuitry, direct-connected large speaker terminals, and high-carbon cast-iron insulator feet suggest carefully considered engineering and robust execution.
Value for Money
85/100
At an indicated price range of $11,490 to $14,975, the A-48S occupies a premium high-end power-amplifier segment. The review strongly promotes its engineering and performance, but it does not directly compare value against similarly priced rivals or state whether the asking price is especially compelling.
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Verified Dealers
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Authorized dealers for Accuphase A-48S
- Resolution A/V — in-store — New York City, New York, United States (website)
- All Elite Audio — online and in-store — Perry Hall, Maryland, United States (website)
- Alma Music & Audio — online and in-store — San Diego, California, United States (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Ann Arbor Audio Design — in-store — Ann Arbor, Michigan, United States (website)
- Audio Connexion — online and in-store — Burlington, Ontario, Canada (website)
- Audio Excellence (CA) — online and in-store — Markham, Ontario, Canada (website)
- Audio Excellence (CH) — Switzerland (website)
- Audio Gallery — online and in-store — Las Rozas de Madrid, Comunidad de Madrid, Spain (website)
- Audio Solutions — online and in-store — Indianapolis, Indiana, United States (website)
and 108 more verified dealers