Menu
Cart 0

Accuphase A-250 Class-A Monophonic Power Amplifier

Accuphase



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

Download the Brochure here.

Download the Fact Sheet here.

 

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

 


 

Sometimes we want to listen to our brand new audio setup without having to worry about dragging B&W up two flights of stairs - that's where we come in! Not only are our team experts in high quality AV equipment, they're also professional bodybuilders* who can deliver and install your new toys quickly and efficiently.

Our in-house team can service those in Brisbane, the Gold Coast, and the Sunshine Coast. Give us a call to get an obligation-free quote today!

*the term 'professional bodybuilders' is used here loosely...