Accuphase A-300 Mono Power Amplifier



Witness a new dimension of musical expressiveness and bold presence

The Accuphase A-300 Mono Power Amplifier redefines the boundaries of high-fidelity sound. This flagship amplifier, designed to celebrate Accuphase's 50th anniversary, delivers unparalleled audio performance with its Class A monophonic design.

Accuphase make some of the finest amplifiers in the world and we can't recommend them highly enough. The beauty of these is that they'll pair well with almost any speakers and make them sound beautiful. A fantastic base to a new system or an unparalleled upgrade to an existing one, an Accuphase amplifier will deliver all the power you need for a lifetime.

Fully balanced signal paths realised with dual instrumentation amplifier configuration

Accuphase's monophonic high-output amplifiers have been constantly refining their technology since the companies founding, and have always led the world's high-end market, delivering a number of historic products. The A-300 is a pure Class A monophonic power amplifier that was born as the successor to the world-famous A-250, the fifth model in their 50th anniversary range. By bringing together the latest technology in all aspects of circuitry and mechanisms, improving noise characteristics and expanding the Class A operating range through higher output, they have achieved the highest level of performance and sound quality that can reproduce the rich emotions of music.

Accuphase A-300 Mono Power Amplifier

Double MCS+ (Multiple Circuit Summing) in amplifier stage realizes highest-ever signal/noise ratio in an Accuphase component

The Double MCS+ configuration uses four circuits for amplifying the input signal, connected in parallel to keep distortion to a minimum and to further enhance S/N ratio and other parameters. The resulting level of sound quality is simply stunning.

Two totally identical power amplifier units driven in parallel

As shown in the circuit diagram of the amplifier section, the power amplification stage makes use of two completely identical power units, each with 10 N-channel and 10 P-channel power MOS-FETs connected in parallel. These units are arranged on the left and right side of the chassis and driven in parallel, resulting in a 20-parallel configuration. This ensures a stable balance in terms of electrical operation, weight distribution, thermal dissipation and other aspects. The parallel drive approach achieves a total allowable power dissipation value of 5.2 kW, which in turn reduces the power load on each MOS-FET, allowing each device to operate effectively in its range of optimum linearity.

Continuous Average Output Power: Normal mode 1000 watts into 1 ohm, 500 watts into 2 ohms, 250 watts into 4 ohms, 125 watts into 8 ohms. Bridged mode (2 units) 2,000 watts into 2 ohms, 1000 watts into 4 ohms, 500 watts into 8 ohms.

Total Harmonic Distortion: 0.05% with a 2-ohm load, 0.03% with a 4 to 16-ohm load

Intermodulation Distortion: 0.01%

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

Gain: 28.0 dB (GAIN selector in MAX position)

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

With music signal: 1 to 16 ohms

Damping Factor: 1,000 or greater

Input Sensitivity: 1.26 V for rated continuous average output (with 8-ohm load), 0.11 V for 1 watt output

Input Impedance Balanced: 40 kilohms

Line: 20 kilohms

Signal-to-Noise Ratio: 127 dB (GAIN selector in MAX position)

Output Level Meter Digital power meter range selection: AUTO / 10 W / 100 W / 1,000 W

Power Requirements: 120/220/230 V AC, 50/60 Hz

Power Consumption: 230 watts idle, 270 watts in accordance with IEC 60065

Maximum Dimensions: Width 465 mm, Height 240 mm, Depth 515 mm

Mass: 46.0 kg net, 55.0 kg in shipping carton

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