Meridian Reference 857 Power Amplifier
Description
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.
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.
Reference 857
The Meridian 857 is a Reference Two-Channel Power Amplifier delivering 500W per channel into 4Ω. This Hi-Res Audio amplifier, bridgeable to >1.5KW, is available as a dedicated rack-mount variant and incorporates a totally new design based upon extensive research. Tremendously powerful with an incredibly low noise floor, the Meridian 857 represents a step change in amplifier design.
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STEREO OR MONOBLOC
In normal mode, delivers 2 x 250 watts into 8 ohms and 500 watts into 4 ohms; continuously on both channels. In bridged mode, delivers 1 x >1 kilowatt into 8 ohms and 1 x >1.5 kilowatts into 4 ohms. -
REFERENCE PERFORMANCE
Low-feedback construction provides ultra-low distortion, ensuring an unparalleled level of clarity and transparency across its full frequency response of 1-100kHz (-/+ 2dB). -
BALANCED DESIGN THROUGHOUT
The signal path is balanced throughout - fed from either the XLR balanced inputs or from the "SuperBal" circuitry which converts unbalanced (single-ended) signals to balanced audio as soon as they enter the amplifier. -
EXTREME CONSTRUCTION
Non-ferrous chassis and panels – aluminium construction for magnetic linearity. Transformer including five secondary windings for maximum isolation between low-power and high-power circuitry. Ground plane design with multilayer circuit boards optimised for signal handling. -
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. -
DUAL BINDING-POSTS
Both channels feature two pairs of binding-posts on their outputs to facilitate bi-wiring of loudspeakers with two sets of connection terminals.
The Meridian 800 Series represents the pinnacle of technological audio innovation and, most importantly, designed and engineered to provide you with the most rewarding personal listening experience possible.
Specifications:
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AUDIO INPUTS
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Two XLR balanced inputs Two RCA unbalanced inputs |
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AUDIO OUTPUTS
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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 |
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CONTROL SIGNALS |
Trigger input [3.5mm 5-30 VDC] |
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COOLING
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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] |
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DIMENSIONS
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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] |
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CONSTRUCTION
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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 |