Welcome to the support page for
HD621 HDMI Audio Processor

Here you will find all of the information that you require to get the most out of your HD621 HDMI Audio Processor .

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No. These streams can be handled by the product, but they are passed to the audio outputs without being decoded, so the device “downstream” of the HD621 would need to be capable of decoding them.

The HD621 cannot decode these streams itself, but its inclusion in a Meridian system can allow these lossless streams to be played in an optimal way.  

The player should be set to output PCM. The terminology used in the set-up menus can vary, but the vast majority of players feature the ability to do this.

Yes. The methods used by Blu-ray players to access and decode lossless streams can be compared to the way a compressed file is extracted and read by a computer. Players do not vary in this regard, so the purchase price has no direct bearing on this aspect of the player’s performance. There is understandable scepticism to this fact in some quarters due to the residual knowledge that the quality of decoding earlier formats, such as those from DVD-Video, could vary according to the design of the player.

No. Although the two sockets mentioned are the same physical type, the signals they carry are not compatible. The socket on the HD621 is intended to be connected to a suitably-equipped Meridian surround controller, rather than a DSP loudspeaker.

No. The RJ45 socket is not a network connection. Rather, it is an output which carries multichannel digital audio in the form of “MMHR”. This interface is proprietary to Meridian and is used between the HD621 and the MMHR input connection on a suitably-equipped Meridian surround controller.

On the set-up program, under the “Audio” tab within “Properties” of the HD621, the setting “Linear PCM” should be set to “6 Ch. Three digital interconnect leads should be connected between the two units. On the HD621, the outputs labelled “1/2”, “3/4” and “7/8” should be connected to the “L/R”, “C/LFE” and “SURR” input sockets respectively on the surround controller.

The two connections can be used according to the requirements of the system. Meridian comms connections should form a “daisy-chain” between the Meridian comms-equipped products in the system. Therefore, many Meridian products carry at least two comms sockets to facilitate this. Between products, any combination of BNC-to-BNC or DIN-to-DIN is valid and two variants can be used throughout the chain as suits. Electronically, the sequence in which the products are connected in the chain is irrelevant having no impact on functionality or performance. However, the order of the products in any given system may be governed by other factors.:

• Some Meridian products carry only one comms socket. By definition, these products can be connected only at the end of the chain and they will determine the type of connection to be used on the adjacent product in the chain.

• If products are separated physically by some distance, the choice of connection may be limited by the type of suitably lengthy leads available to hand.

Important note: In all system combinations, only one comms connection should be used between any two Meridian products. Using two or more connections between a pair of products will introduce problems with communication and control.

Meridian comms is very tolerant of the type of cable used for the connection. A suitably long phono interconnect lead (either analogue or digital) can be made into a comms lead by adding RCA-to-BNC adapters to each end. These adapters tend to be more readily available than ready-made BNC leads.

No. The HD621 was designed with the capability of passing a maximum video resolution of 1080p.

Although the HD621 was designed prior to the introduction of 3D capability to HDMI connections, the product had its firmware updated so that it can pass such signals.

No, but it can handle 3D video. The emergence of 3D video was part of a change in capabilities of HDMI connections known as “HDMI 1.4”. The HD621 had its firmware updated so it can pass 3D signals, but none of the other features linked to this change was addressed. Therefore, it is correct to state that the HD621 is compliant with the earlier “HDMI 1.3” specification, but with the added ability to pass 3D video.

The addition of any device to an HDMI set-up can introduce the possibility of a compatibility issue. The handshaking used by HDMI to ensure copy-protection is particular prone to vagaries with various cable types and if any cables are over the maximum seven metres laid out by the HDMI specification, then they may work in one combination, but not another. If problems arise, alternative cables should be tried. Further to that, it may be necessary to substitute any conventional HDMI cable over seven metres in length with one of the proven installation solutions which send HDMI over alternative connection methods, such as network cables.

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