Meridian Reference 857R 2 Channel Rack Mount Power Amp

Meridian Reference 857R 2 Channel Rack Mount Power Amp

We have this BRAND NEW unit that we are selling as we no longer have a use for it.

Since the unit is new we are using stock photos

This unit is new in the box and we also have a demo model of the Reference 857 (non rack mount version) available of the under a different ad.

No warranty is offered of inferred

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. W

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.

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 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. 
Effortless power delivery of 500W per channel into four ohms and bridgeable to >1.5kW mono into 4Ω. 
Meridian ‘Superbal’ technology – converts unbalanced inputs to balanced before they enter the amplifier. 
1-100kHz frequency response -/+ 2dB – Perfect for hi resolution audio. 
2 RCA, 2 x balance on XLR. Trigger on 3.5mm. 4 WBT terminals per side allowing bi-wiring. 
Low feedback construction provides ultra- low distortion, ensuring an unparalleled level of clarity and transparency across the audible range. 
Fan assisted cooling operating at elevated temperatures enabling silent operation in room and rack installations 
Multiple installation applications, enabled by Meridian’s complimentary Design and Specification Service and the perfect complement to any passive loudspeakers. 
TECHNICAL DETAILS
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] 
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