A-250 Class-A Monophonic Power Amplifier
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A-250 Class-A Monophonic Power Amplifier
Ultra-low-noise design with 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.
- 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 output stage delivers linear high power progression to ultra-low 1-ohm impedance
- Input section configured as dual instrumentation amplifier
- Double MCS+ circuit and current feedback topology in amplification stage
- Support for bridged use of two A-250 units for even higher output power
- Strong power supply with massive high-efficiency toroidal transformer and large filtering capacitors
| Continuous Average Output power (20-20,000 Hz) |
Normal mode: 800 watts into 1 ohm*1 400 watts into 2 ohms 200watts into 4 ohms 100 watts into 8 ohms*2 Bridge mode (2 units): 1600 watts into 2 ohms*1 800 watts ito 4 ohms 400 watts into 8 ohms Notes: (*1) Rating makes *1 are for music signals only. (*2) The output range for pure class A operation is 100 W. |
| 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 - 20 000 Hz + 0 - 0.2dB At 1 watt output: 0.5 - 160000Hz +0 - 3.0dB |
| Gain | MAX, -3dB, -6dB, -12dB |
| 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 (A-weighted, with input shorted) |
127dB (GAIN selector in MAX position) 133dB (Gain selector in -12dB position) At rated continuous average output |
| Output Level Meter |
Digital Power Meter: 5-digit indication showing true power ( W) Range selection AUTO / 10W / 100W / 1000W 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 |
| Maximum Dimensions |
Width: 465mm (18.31) Height: 238mm (9.37) Depth: 514mm (20.24) |
| Mass |
46.0kg (101.4 lbs) net 55.0kg (121.3 lbs) in shipping carton |
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