Details POWERED ZONE CONTROLLER Designed for in-room and in-rack systems, the 251 Powered Zone Controller contains all the functionality needed to create a great sounding and flexible Hi-Res Audio zone. With two powerful, cool-running channels of on-board amplification, the Meridian 251 can comfortably drive a pair of loudspeakers or a sound bar with Meridian's trademark fidelity and High Resolution performance. IP Control allows for seamless integration and flexibility within the home. MQA delivers master quality audio in a file that’s small enough to stream or download. Lip Sync realigns audio and video following separation to ensure that there is no delay. Meridian High Resolution [MHR] allows the secure movement of high resolution digital audio, without degradation or loss in quality. A significant number of control options are provided on the Meridian 251 Zone Controller, including IP control, Meridian Sooloos Control, IR and Digital Active Loudspeaker control. In addition, the unit’s front panel features multiple LEDs to indicate source selection, including one that signals MQA playback. Configuration via web browser is also available. TECHNOLOGIES IP CONTROL IP Control allows for seamless integration and flexibility within the home. Also includes both digital and analogue inputs and outputs. LIP SYNC Video processing typically delays the picture. As sound travels slower than light, the effect of the sound arriving before the picture is highly noticeable. For installations where the audio and video are separated before video processing, the Meridian 251 has adjustable audio delay to realign the audio with the video. FIFORECLOCKING Clock variations, known as jitter, are one the main causes of unpleasant “glare” in digital audio systems. The Meridian 218 solves this problem with a proprietary jitter reduction technique using a FIFO (first-in first-out) buffer that allows an independent output clock to deliver clock performance that does not rely upon on the incoming signal quality. DSP UPSAMPLING FILTER Almost all audio has been digitally processed, even if it arrives at the Meridian 251 in analogue form. Upsampling allows the Meridian 251’s DACs to run at a higher sample rate and achieve their full potential. Upsampling also provides the opportunity to apply apodising correction to ameliorate time-domain errors that have been introduced to the signal by the ADCs or other upstream processing. MQA Sourced from the original studio master recording as approved by the creative team, MQA combines an advanced new digital sampling technology that captures extremely high frequency timing and detail in an audio signal with an equally novel system to “encapsulate” that data into a form for delivery using any lossless file format or streaming. The listener’s decoder reconstructs the entire original signal, bringing up an indicator confirming that what they are hearing is exactly the same as the original master. Without the decoder, the listener enjoys CD quality reproduction. Its most advanced form, “MQA Studio”, uses the technology in the studio to generate an even higher quality master recording as the source. Specifications AUDIO OUTPUTS Speaker outputs on Phoenix connectors 24-12 AWG Compatible 2 x 100w into 4Ω nominal load (2 x 65w into 8Ω) 40kHz Bandwidth 2-channel line-level analogue output on RCA phono connectors Twin 192kHz 24-bit DACs AUDIO INPUTS One 2-channel digital coaxial S/PDIF input. 44.1kHz to 192kHz sampling and up to 24-bit One 2-channel Meridian SpeakerLink input. 44.1kHz to 192kHz sampling and up to 24-bit One 2-channel digital optical TOSLINK input. 44.1kHz to 96kHz sampling and up to 24-bit One 2-channel analogue input on RCA phono connectors One network input (Ethernet) for connection to a Roon system or an alternative control interface CONTROL SIGNALS IP Control IR on 3.5mm jack Meridian Comms DISPLAY LEDs to indicate source selection and MQA status POWER Advanced linear power supply:| 220-240V ac 50/60Hz DIMENSIONS HEIGHT: 42mm [1.65in] (without feet) WIDTH: 204mm [8.03in] DEPTH: 221mm [8.7in] (226mm inc. connectors) [8.89in] WEIGHT: Standalone: 2.5Kg [5.5lbs]
