Accuphase
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Specs
| Amplifier Type | Pure Class-A monophonic power amplifier |
| Rated Output Power (8 ohms) | 125 W |
| Rated Output Power (4 ohms) | 250 W |
| Rated Output Power (2 ohms) | 500 W |
| Rated Output Power (1 ohm) | 1000 W |
| Total Harmonic Distortion | 0.03 percent (4 to 16 ohms), 0.05 percent (2 ohms) |
| Frequency Response | 20 Hz to 20 kHz +0 / -0.2 dB (rated output), 0.5 Hz to 160 kHz +0 / -3.0 dB (1 W) |
| Damping Factor | 1000 |
| Input Sensitivity | 1.26 V (balanced/unbalanced) for rated output |
| Input Impedance | 40 kilohms (balanced), 20 kilohms (line/unbalanced) |
| Gain | 28.0 dB |
| Signal to Noise Ratio | 130 dB (A weighted, gain MAX) |
| Dimensions (W x H x D) | 465 x 240 x 515 mm (18.31 x 9.45 x 20.28 in) |
| Weight | 46.0 kg |
| Power Consumption | 230 W (idle), 270 W (per IEC 62368-1) |
Warranty
Sold as an authorized Accuphase dealer by All Elite Audio. New Accuphase A-300 units include the full Accuphase USA manufacturer warranty of 3 years parts and labor for the original owner. Contact us with any service or setup questions.
What's in the Box
- Accuphase A-300 monophonic power amplifier
- Detachable AC power cord
- Owner's manual
- Warranty documentation
Overview
The Accuphase A-300 is a pure Class-A monophonic power amplifier and the flagship of Accuphase's celebrated Class-A lineage. Built as a single-channel powerhouse, it dedicates an entire massive chassis, transformer, and power supply to one channel, allowing it to deliver enormous instantaneous current with the linear, low distortion behavior that has made Accuphase Class-A designs so revered.
Engineering highlights include a heavily paralleled output stage using multiple power transistors per channel to raise current capability and lower output impedance, an instrumentation-style balanced input topology, and Accuphase's signature MCS (Multiple Circuit Summing) and current feedback principles that preserve wideband stability and vanishingly low noise. The output rating doubles as impedance halves, a hallmark of a true high-current design, and the amplifier remains in Class-A operation across its rated range for consistent tonal character regardless of load.
The A-300 is intended for the listener building a no-compromise reference system, where a pair of monoblocks drives demanding loudspeakers with authority, refinement, and long-term musical ease. Paired with an Accuphase precision preamplifier and high-resolution loudspeakers, it forms the heart of a system designed to last for decades.
Key Features
- Pure Class-A monophonic design with one full chassis dedicated to each channel
- Massive paralleled output stage using multiple power transistors for high current delivery
- Output power doubles as impedance halves, indicating an exceptionally robust power supply
- Balanced instrumentation-style input topology for excellent common mode noise rejection
- Current feedback principle for wide bandwidth and outstanding stability
- Large capacity power transformer and high filter capacitance for effortless dynamics
- Analog power meters with peak indication for real time monitoring
- Gain selectable operation and both balanced and single ended inputs
- Meticulous Japanese construction engineered for decades of reliable service
How the A-300 Compares
Accuphase A-300 vs Accuphase A-80
The A-80 delivers Accuphase's pure Class-A character in a single stereo chassis, an elegant choice where one box driving both channels is ideal. The A-300 takes the monophonic route, giving each channel its own dedicated power supply and chassis for maximum current and channel separation in the most demanding reference setups. Choose the A-80 for a refined single-chassis solution and the A-300 pair when you want the ultimate expression of Class-A monoblock design. See the Accuphase A-80.
Accuphase A-300 vs Accuphase A-48S
The A-48S is a stereo Class-A amplifier that brings the warmth and linearity of the Class-A family to more compact and moderately sized systems. The A-300 scales that same sonic philosophy up to full monophonic form with far greater current reserves for difficult loads. Consider the A-48S for a single-chassis Class-A system and the A-300 monoblocks when driving power hungry loudspeakers to reference levels. See the Accuphase A-48S.
Accuphase A-300 vs Luxman M-10X
The Luxman M-10X is a high-powered stereo amplifier with its own distinctive voicing and dual mono internal layout suited to a wide range of loudspeakers from a single chassis. The Accuphase A-300 pursues the pure Class-A monophonic route for a warm, effortless character and total channel isolation. Both are flagship level statements, so the choice comes down to preferred tonal character and whether you want a stereo chassis or dedicated monoblocks. See the Luxman M-10X.
Recommended Speakers and Preamplifier
As a flagship Class-A monoblock, the A-300 rewards revealing loudspeakers and a matching Accuphase precision preamplifier that preserves its purity and dynamic authority.
- Marten Parker Trio Diamond The diamond tweeter and ceramic drivers reveal every nuance of the A-300's low distortion Class-A output, making a transparent and refined reference pairing.
- Gauder Akustik Capello 100 DV This high resolution floorstander thrives on abundant clean current, allowing the A-300's doubling output to deliver effortless dynamics and tight bass control.
- Spendor Classic 200Ti A large, full range classic design that pairs beautifully with the warmth and grip of Class-A monoblocks for a rich, room-filling presentation.
- Accuphase C-3900S The flagship precision preamplifier matches the A-300 in resolution and balanced signal integrity, forming a true statement front end for the monoblocks.
- Accuphase C-2900 A superb precision preamplifier that provides balanced connection and low noise volume control ideal for driving a pair of A-300 monoblocks.
Frequently Asked Questions
Is the Accuphase A-300 a mono or stereo amplifier?
It is a monophonic power amplifier, meaning one unit powers a single channel. You use two A-300 units, one for each speaker, to build a complete stereo system.
Does the A-300 operate in pure Class-A?
Yes, the A-300 operates in pure Class-A throughout its rated output range, which is the source of its smooth, linear, low distortion character.
How much power does the A-300 produce?
It is rated at 125 watts into 8 ohms per channel, doubling to 250 watts into 4 ohms and 500 watts into 2 ohms, reflecting its very robust high current power supply.
Why does the output power double as impedance halves?
This behavior indicates an exceptionally stiff power supply and a high current output stage, allowing the amplifier to maintain control over demanding, low impedance loudspeakers.
What kind of loudspeakers suit the A-300?
It excels with high resolution and current hungry loudspeakers, from refined diamond driver designs to large full range classic speakers, thanks to its abundant current reserves.
Do I need two A-300 units for stereo?
Yes, a stereo system requires a matched pair of A-300 monoblocks, one dedicated to each channel.
Can the A-300 be bridged or run in bi-amp configurations?
Accuphase Class-A monoblocks support various high current configurations. We recommend confirming the exact intended setup with us so we can advise on the optimal wiring for your speakers.
Does the A-300 have balanced inputs?
Yes, it offers balanced input via its instrumentation-style topology as well as single ended input, with high input impedance for easy matching to quality preamplifiers.
What preamplifier should I pair with the A-300?
An Accuphase precision preamplifier such as the C-3900S or C-2900 is an ideal match, preserving the amplifier's purity, low noise, and balanced signal integrity.
What is the damping factor of the A-300?
The A-300 offers a damping factor of 1000, giving it firm control over loudspeaker cone motion for tight, articulate bass.
How does the A-300 differ from the A-80?
The A-80 is a stereo Class-A amplifier in one chassis, while the A-300 dedicates a full chassis and power supply to each channel for maximum current and channel separation.
Does the A-300 run hot?
Pure Class-A amplifiers generate significant heat by design, so the A-300 uses substantial heat sinking. Provide adequate ventilation and avoid enclosing the units in tight cabinetry.
What are the analog meters for?
The front panel meters display output level with peak indication, allowing real time monitoring of how hard the amplifier is working.
How much does the A-300 weigh?
Accuphase flagship monoblocks are very heavy due to their large transformers and heat sinks. We can provide the exact shipping weight and recommend safe placement and handling.
Is the A-300 suitable for a lifetime reference system?
Yes, it is engineered and built to Accuphase's highest standards for decades of reliable service, making it a genuine long term reference investment.
What warranty does the A-300 include?
As an authorized Accuphase dealer, we provide a 3 year parts and labor warranty to the original owner.
Can I use the A-300 with a non-Accuphase preamplifier?
Yes, its high input impedance and balanced input make it flexible, though pairing with an Accuphase preamplifier ensures fully optimized system synergy.
Does the A-300 support high resolution and full bandwidth signals?
Yes, its frequency response and current feedback topology are designed for wide bandwidth and stable, transparent reproduction of demanding source material.
How do I know if the A-300 is right for my room and speakers?
Contact us with details of your speakers and listening space and we will advise whether the A-300 monoblocks or another Accuphase amplifier best fits your goals.
Why buy from All Elite Audio?
All Elite Audio is an authorized Accuphase dealer in Maryland offering genuine products with full factory warranty, expert system matching, and dedicated support before and after your purchase.
