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The A-250 encompasses Accuphase power amplifier know-how to the fullest. It is destined to become another milestone, taking the art of audio to the next level. In order to realize ideal speaker drive capability, the A-200 employs a structural design that exceeds even the M-6200. Two completely separate power amplifier units, each with its own dedicated heat sink on either side of the chassis, are driven in parallel.
Another outstanding characteristic of the A-250 is its enormously improved S/N ratio. By adopting the advanced instrumentation amplifier principle for the input stage in a double configuration, using only discrete electronic components instead of ICs, and fine-tuning the gain complement with the following stage, simply amazing S/N ratings were achieved: 126 dB at the maximum gain setting and 132 dB with gain set to –12 dB. These represent ultimate values even in the formidable Accuphase lineup.
Continuous Average Output Power (20 – 20,000 Hz)
Normal mode:
– 800 watts into 1 ohm ＊1
– 400 watts into 2 ohms
– 200 watts into 4 ohms
– 100 watts into 8 ohms ＊2
Bridged mode (2 units):
– 1,600 watts into 2 ohms ＊1
– 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
Output Load Impedance:
– Continuous output: 2 to 16 ohms
– With music signal: 1 to 16 ohms
Damping Factor: 1,000
Input Sensitivity (with 8-ohm load):
– 1.13 V for rated continuous average output
– 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)
– 133 dB (GAIN selector in –12 dB position)
– At rated continuous average output
Output Level Meter
Digital power meter:
– 5-digit indication showing true power (W)
– Range selection AUTO / 10 W / 100 W / 1,000 W
Bar graph meter:
– Represents output voltage values (dB) using 40 points
Peak hold time:
– 1 second / ∞ (infinite) selectable ＊Display off switch provided
Power Requirements: 120/220/230 V AC, 50/60 Hz
Power Consumption:
– 300 watts idle
– 430 watts in accordance with IEC 60065
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