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Meridian Audio: HD621

Availability: In stock

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Ex-Demo version available for £600.00

The HD621 is a pitch-perfect problem solver. HDMI connectors are a common sight on high-definition equipment, helpfully carrying audio and video signals. But digital video signals can prove detrimental to sound quality – so the HD621 cleverly solves this problem by extracting the audio signal from the HDMI input and routing it through the high-tech audio processing of a Meridian system.  

Soundcraft's Opinion

Meridian are the only company allowed to build a unit like this that keeps the audio and picture completly separate from each and thus retains the best of both. Do we need to say more ??? Ok this unit at £1,500 was and still is a mandatory component but it has now come down to £999. more ??? The G65 prcoessor has also come down from £4,500 to £2,999. Great time to buy one of the best surround receivers on the market.

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The result is a significant boost in your system’s sound quality. Not only that, the HD621 also ensures that sound is always in perfect synchronisation with the picture – no more watching the actor’s lips move and hearing the sound follow a moment after. With space for up to six HDMI-equipped devices, the HD621 design matches the Meridian line and is available in free-standing and rack-mount versions. Problem solved.


The Meridian HD621 HDMI Audio Processor is the vital link between your Meridian system and the latest sources, such as Blu-ray Disc®, satellite/TV receivers and gaming consoles with HDMI outputs.

Many components supply both audio and video via the same HDMI cable, which compromises quality. The HD621 separates the HDMI signal from up to six sources into its audio and video elements, maximising the audio quality and delivering it to your Meridian system free of video pollution, while the video content is fed direct to the display via a single cable, eliminating additional switching.

The HD621 integrates multiple HDMI sources – including those with 3D video – seamlessly into your Meridian system. So seamlessly, in fact, there’s even a programmable lip-sync delay to be sure sound and picture remain in perfect synchronisation – one of the most important details in a quality video experience.

If you want to expand your Meridian experience to include the latest audio and video components, the HD621 forms the vital link.

Supports both 2D and 3D video formats.

A perfect partner for one of Meridian's Surround Sound Processors such as the G61R, G68, or 861, enabling you to input and decode HDMI audio sources.


Six-input HDMI switch.

HDMI video output.

Extracts up to eight channels of high-resolution audio from the HDMI data stream, supplying them to separate audio-only outputs.

Connects HDMI audio direct to a Meridian system.

Smartlink coaxial digital audio output (up to 8 channels).

Multichannel Meridian High Resolution (MMHR): balanced digital audio output via RJ45/Cat 5 cable (up to 8 channels).

Up- and down-sampling of digital audio.

Audio FIFO buffering and resolution enhancement improves PCM audio received via HDMI.

Lip-sync control compensates for latency resulting from external digital video processing.

Keeps HDMI video signals away from your audio equipment, minimising signal degradation.

The HD621 performs up- and down-sampling of digital audio and includes Meridian's unique apodising system to ensure the very best sound from today’s varied sources. Meridian’s highest-performance FIFO buffering technology removes HDMI jitter, consistently delivering a significant improvement in audio quality from all your HDMI sources.

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Power input (IEC connector)
DB9M Sub RS232 serial connector
BNC and DIN Meridian Comms
Six HDMI input sockets
HDMI output
8-channel MMHR digital audio out (RJ45)
8-channel coax digital audio out (4 x phono)
Front-panel Indicators
Power LED
6 x HDMI Input LEDs (selected input lights)
Form factor
1U 19in rack mounting or free-standing
Internal universal power supply, 100–250V AC
Maximum power consumption: 40W