Welcome to the support page for
DSP640 In-Wall Loudspeaker

Here you will find all of the information that you require to get the most out of your DSP640 In-Wall Loudspeakers.

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When the loudspeaker is in Standby mode a blue LED will show on the front of the loudspeaker.

The DSP640 comes out of Standby mode when it receives an appropriate communication signal from another Meridian product. This signal is received on the Speakerlink input socket of the loudspeaker and is produced when the rest of the system is brought out of Standby. When this happens, the front panel LED will change from blue to white.

If the IR receiver is off, the white LED flashes once when the loudspeaker is powered up at the mains. If IR is on, the white LED flashes twice.

This requires the use of a Meridian MSR+ remote-control – or a third-party remote programmed to emulate the MSR+. Instructions can be found in the product’s user guide.

Each loudspeaker uses a maximum of 500W.

The loudspeaker on the left (when viewed from the listening position) should be set to “L/C” and the loudspeaker on the right should be set to “R”. The switch is required because the Speakerlink lead feeding the loudspeaker carries both left and right audio channels. The switch “tells” the loudspeaker which channel to pick up from the lead. This is true even when each loudspeaker is fed with a dedicated Speakerlink lead.

Loudspeakers in use as main-left, side-left, rear-left or centre channels should be set as “L/C”. Set the switch to “R” for loudspeakers in use as main-right, side-right or rear-right channels.

The pair of loudspeakers can be connected in a “daisy-chain” arrangement. The input of one loudspeaker should be connected to the Speakerlink output on the controller-product. The output of this loudspeaker is then connected to the input socket on the other loudspeaker.

Yes. If cabling arrangements or other physical considerations preclude star-wiring, daisy-chaining can be used for a pair of DSP640 loudspeakers. This applies as long as the two loudspeakers are a “pair” as defined in a Meridian system, i.e. they are the left and right main channels, the rear-left and rear-right channels or the side-left and side right channels.

As DSP640s are capable of delivering low-bass at high levels, it is usually advisable to set them as “Large”. However, there are instances where it may be advantageous to set them as “Small”. This applies in systems where all of the loudspeakers for the main channels are capable of handling low frequencies and where the subwoofer arrangement can handle copious amounts of bass. In such a set-up, the DSP640s may be set as “Small” in conjunction with selecting an appropriate low-frequency for the “Crossover” setting within the configuration program. This will divert only the very lowest bass away from all the loudspeakers defined as “Small” and send it to the subwoofer(s) - as well as any loudspeakers which are defined as “Large”. This may provide superior bass performance overall. As with many aspects of bass management configuration, experimentation can be used to get the best result.

Bass output can be increased, but it may require some configuration. Refer to our support documentation relating to DSW for further information.

No. Most subwoofers require to be fed with a variable analogue audio signal. This does not exist in a two-channel Meridian system. Even subwoofers which feature a digital input are unlikely to offer any practicable method of integration due to issues with controlling volume evenly across the system.

Yes. There will be no need to use an external PSU with the Media Source 200.

Yes. There will be no need to use an external PSU with the Distributor 1.

Power will be provided to the specific Distributor module connected to the DSP640. However, the three modules within the Distributor 3 are completely independent, so power will need to be provided from elsewhere to the other two modules if they are in use.

The DSP640 can be used vertically as a centre-channel. However, it is not ideal for use as a centre-channel loudspeaker when horizontally oriented. This is because the wide-range drive units which product the treble frequencies, as positioned off-centre on the baffle of the loudspeaker. Hence, if a DSP640 is positioned horizontally and centrally at the front of a system, the sonic image will be created slightly off-centre. In such use-cases, the smaller DSP520 loudspeaker can be used horizontally as it does not suffer from this limitation due to its centrally-positioned wide-range driver.

Each loudspeaker features a 200W Class AB amplifier powering the wide-range drivers, while a 310W Class D amplifier powers the bass drivers.

No. The back-box is an integral part of the design of the loudspeaker and plays a great part in making the loudspeaker safe to install and use. It has a major bearing in regard to fire prevention.

Yes. By default, the loudspeaker has EBA enabled and the internal switch for EBA is set to change only if the loudspeaker receives the relevant command on its Speakerlink input. This behaviour can be changed by adjusting the internal setting for EBA using the relevant RS232 command. This allows the loudspeaker to have EBA switched on or off irrespective of any command received over Speakerlink.

Centre Elevation allows the image from a centre-channel loudspeaker to be raised to be in line with the main left and right loudspeakers. In Meridian surround-sound installations where the DSP640 is mounted horizontally below a screen, Centre Elevation can be adjusted to give the impression that centre-channel sound is coming from the screen rather than below it. The setting is selectable between a minimum, a medium or a maximum elevation effect. It can be adjusted from the menu system of any Meridian Surround Controller equipped with SpeakerLink outputs. The option also exists to set Centre Elevation on the speaker via RS232. This RS232 setting is non-volatile, so if preferred it can be selected and set to a fixed level as part of the installation process.

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