Accuphase A-250 Mono Power Amp


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Witness a new dimension of musical expressiveness and bold presence

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. The A-250 is regarded as the best performing amplifier Accuphase has made.

Fully balanced signal paths realized with dual instrumentation amplifier configuration

The A-250 features fully discrete circuit components in a dual configuration employing the latest instrumentation amplifier topology, allowing all signal paths throughout the power amplifier to be fully balanced. This not only eliminates any possible internal sources of noise or distortion as demonstrated by the outstanding performance ratings, it also makes the amplifier highly impervious to changes in ambient conditions. Consequently, operation stability and reliability which are crucial for a power amplifier have been dramatically enhanced.

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.

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Continuous Average Output Power: Normal mode 800 watts into 1 ohm, 400 watts into 2 ohms, 200 watts into 4 ohms, 100 watts into 8 ohms. Bridged mode (2 units) 1,600 watts into 2 ohms, 800 watts into 4 ohms, 400 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 Gauranteed, Max 1400

Input Sensitivity: 1.13 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: 300 watts idle, 430 watts in accordance with IEC 60065

Maximum Dimensions: Width 465 mm, Height 238 mm, Depth 514 mm

Mass: 46.0 kg net, 55.0 kg in shipping carton

Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.