Accuphase A-250 CLASS-A MONOPHONIC POWER AMPLIFIER
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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.
Features & Specifications
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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