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Reference Two Channel Power Amplifier 857
Our most powerful reference two channel amplifier has been designed and built to deliver the best possible Hi-Res audio performance from any high-quality passive loudspeaker system. Its low-feedback construction provides ultra-low distortion, ensuring an unparalleled level of clarity and transparency across the audible range.

Key Features:

  • Bridgeable to over 1.5Kw, the Meridian 857 features a totally new design for a Meridian power amplifier, borne out of extensive research, experience and a thorough understanding of psychoacoustic principles.
  • Effortless power delivery of 500W per channel into four ohms and bridgeable to >1.5kW mono into 4ohms.
  • 1-100kHz frequency response -/+ 2dB – Perfect for high resolution audio.
  • Fan assisted cooling operating at elevated temperatures enabling silent operation in room and rack installations.
  • Low feedback construction provides ultra-low distortion, ensuring an unparalleled level of clarity and transparency across the audible range.

Error Correction and Linearity
The open-loop characteristics of an amplifier are crucial to its sound quality. The power amplifier design is intrinsically linear and uses error correction in the output stage to provide low open-loop output impedance. This allows the power amplifier to achieve impeccable measured performance and a high damping factor while only applying modest amounts of negative feedback.

Superbal
The use of shunt feedback to eliminate common mode distortion is well known. Meridian’s proprietary ‘Superbal’ circuitry brings this advantage to the balanced input, while also converting unbalanced signals to balanced as they enter the amplifier.

 

AUDIO INPUTS

  • Two XLR balanced inputs
  • Two RCA unbalanced inputs

AUDIO OUTPUTS

  • 250W RMS into 8 Ohms per channel both channels driven
  • 500W RMS into 4 Ohms per channel both channels driven
  • Bridgeable to >1KW RMS into 8 Ohms
  • Bridgeable to >1.5KW RMS into 4 Ohms
  • 4 WBT terminals per side allow bi-wiring

CONTROL SIGNALS

  • Trigger input [3.5mm 5-30 VDC]

COOLING

  • High level of passive cooling for silent in-room running
  • Six variable speed fans maintain amp functionality if hostile thermal conditions encountered in rack

DISPLAY

  • Backlit touch sensitive logo changes colour to indicate amplifier’s status
    ‘Standby’ [BLUE], ‘Normal Operation’ [GREEN]’, ‘Fans Active’ [AMBER], ‘Overload’ [RED]

DIMENSIONS

  • HEIGHT:
    175mm [6.9in] without feet
    195mm [7.7in] with feet
  • WIDTH:
    480mm [18.9in]
  • DEPTH:
    Standalone 445mm [17.6in]
    Rack-mount 425mm [16.8in]
  • WEIGHT:
    Standalone 32kg [70.5lbs]
    Rack-mount 35kg [77.1lbs]

CONSTRUCTION

  • Black finish in aluminium and glass
  • Dedicated Rack-mount variant (4U high)
  • Custom Meridian Select colours also available

POWER

  • Advanced linear power supply: 100V ac 50/60 Hz | 110-120V ac 50/60Hz | 220-240V ac 50/60Hz

 

"I totally enjoyed my listening sessions with the Meridian 857. Its musicality allowed me to easily sink into any music genre – it never failed to sound wholly natural and inviting. The Meridian 857’s purity, accuracy, life, presence and transparency were extremely satisfying. Indeed, the Meridian Reference Two-Channel Power Amplifier 857 is a true reference product."

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