Ultra-low-noise design with an unprecedented S/N ratio of 127 dB brings out a stunning wealth of detail. Semiconductor MOS-FET switches enable output circuitry without any mechanical contacts. Two pure class A power units arranged right and left are driven in parallel to deliver 100 watts into 8 ohms with impeccable quality. A damping factor in excess of 1,000 means that speaker control is nothing less than perfect. The massive A-250 represents a new pinnacle in power amplifier history. Encounter music like never before.

Warranty:

1-year manufacturer’s warranty

Features:

  • Pure Class A operation delivers 100 watts of quality power into 8 ohms
  • Two totally identical power amplifier units driven in parallel
  • 20-Parallel push-pull arrangement of MOS-FET devices in the output stage delivers linear high power progression to ultra-low 1-ohm impedance
  • Input section configured as a dual instrumentation amplifier
  • Double MCS+ circuit and current feedback topology in the amplification stage
  • Support for bridged use of two A-250 units for even higher output power
  • Strong power supply with a massive high-efficiency toroidal transformer and large filtering capacitors

WITNESS A NEW DIMENSION OF MUSICAL EXPRESSIVENESS AND BOLD PRESENCE
Accuphase makes 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 sides 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.

Technical Specifications:

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 Guaranteed, 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 ca