Audio Research REF250 SE Monoblock Amplifier Pair, Silver Finish, Pre-Owned

Sale price
List price
The concept of a large monoblock amplifier is to provide control to a speaker. The difficult part of the job is maintaining finesse and musicality while doing it. Audio Research has produced some of the most critically acclaimed products during its 42-year history and the new Reference 250 SE aims to break new ground.

Great condition pre-owned Audio Research REF250 SE Monoblock Amps.

Units come with original box, packaging, power cord, and manual.

Rated 8/10 for minor cosmetic wear consistent with age and use.

  • POWER OUTPUT: 250 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 250 watts, below .04% at 1 watt. Approximate actual power available at "clipping" 270 watts (1kHz). (Note that actual power output is dependent upon both line voltage and "condition" i.e. if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not very critical.)
  • POWER BANDWIDTH: (-3dB points) 5Hz to 70kHz.
  • FREQUENCY RESPONSE: (-3dB points at 1 watt) 0.5Hz to 110 kHz.
  • INPUT SENSITIVITY: 2.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms.)
  • INPUT IMPEDANCE: 200K ohms Balanced.
  • OUTPUT TAPS: 4, 8, 16 ohms.
  • OUTPUT REGULATION: Approximately 0.9dB 16 ohm load to open circuit (Damping factor approximately 10).
  • SLEW RATE: 20 volts/microsecond.
  • RISE TIME: 1.5 microseconds.
  • HUM & NOISE: Less than 0.2mV RMS – 110dB below rated output (IHF-A weighted, input shorted, 16 ohm output).
  • POWER SUPPLY ENERGY STORAGE: Approximately 900 joules.
  • POWER REQUIREMENTS: 105-130VAC 60Hz (260-250VAC 50Hz) 770 watts at rated output, 1000 watts maximum, 380 watts at "idle," 1 watt off.
  • TUBES REQUIRED: 3 Matched pair KT150 (Power output V1-6); 1 Matched pair KT150 (Driver V8-9); 2 6H30 (Gain stage V7 and Regulator Driver V10); 1 6550C (Regulator V11).
  • DIMENSIONS (WHD): 19" x 8.75" x 19.5" Handles extend 1.5" forward.
  • WEIGHT: 73 lbs. (33.2 kg) Net; 88 lbs. (40 kg) Shipping.


Please call 734.662.3595 and ask for Richard if you have any questions about this product.

We make every effort to update our ads quickly when inventory fluctuates, but we encourage you to call and check product availability, as we are also a brick and mortar store.

Only 1 left in stock!