Welcome to the support page for
251 Powered Zone Controller
Here you will find all of the information that you require to get the most out of your 251 Powered Zone Controller.
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251 Product Overview
251 Quick Start Guide
How to install and set-up the Sooloos app on a QNAP NAS
The 251 is intended to be partnered with a pair of passive loudspeakers to provide audio in a single room or zone. It can be controlled over IP via the product’s Ethernet network socket, from an IR receiver plugged into the unit or via Meridian comms from suitably-equipped Meridian products. The 251 carries analogue and digital inputs and features high-performance amplification. In addition to its two speaker outputs, the 251 carries a pair of line-level analogue outputs so it can run a 2.1 system with a subwoofer or be used with additional external amplification. The 251 also acts as a Sooloos audio end-point and it supports the decoding of MQA files.
Yes. It has inputs which accept conventional line-level analogue audio and industry-standard SPDIF digital audio – in both co-axial and optical forms. Its speaker outputs can be used with any conventional passive loudspeakers. The line-level outputs are suitable for use with powered subwoofers, any standard power amplification or analogue active loudspeakers.
Once some form of control is added, the 251 can act as a conventional integrated amplifier providing source selection, volume control and power amplification.
The amplification is cool-running and provides up to 2 x 100W per channel into 4 Ohms (2 x 65W per channel into 8 Ohms). The amplification has a high peak output current capability to drive difficult loads and offers a true Hi-Res bandwidth of 40 kHz.
96kHz, 24 bit.
There is no practicable limit as long as the network is capable of dealing with the traffic derived from multiple devices.
In some systems, video processing causes video to be delayed in relation to the audio. This appears unnatural, adversely affecting the viewing and listening experience. The 251 allows the sound to be delayed to compensate for this effect, realigning the audio with the video.
The unit features a high-quality linear PSU and is powered via a “clover-leaf” mains lead (supplied with the product).
Instructions are shown on this video.
Any 251s used within Sooloos systems will receive this software update automatically as part of main Sooloos software update. No additional procedures are required. Any 251 which is not being used within a Sooloos system can be updated using the latest version of Meridian Sooloos Configure program. Simply run the program on a PC connected to the same network as the 251 and the unit’s software will be updated automatically. In systems with more than one 251, all of them will be updated automatically as soon as the program sees them on the network. This update method applies to those units being used with Roon and those used as “stand-alone” controllers.
This socket is intended to allow the connection of an infra-red receiving “eye” device, such as the Meridian G12 Remote Sensor.
Yes. Many third-party control systems feature outputs suitable for feeding IR emitter devices (also referred to as IR “blasters”). The signals from these outputs differ from the signals derived from infra–red receivers in that they are modulated with a carrier frequency. However, the 251 is designed to receive both types of signal without any issues.
Some equipment introduces delay to video signals fed through it. Processes such as scaling can cause this. Lip Sync allows a delay of up to 85 milliseconds to be added to the audio signal to correctly align the sound and picture. However, if the converse is happening and audio is delayed relative to video, i.e. sound is behind the pictures, Lip Sync cannot be used to rectify the problem.
Unwanted delays can be problematic in multi-zone systems which include a mixture of one of more zones using EBA-capable Meridian DSP loudspeakers and one or more zones using analogue loudspeakers. This stems from the fact that EBA introduces a delay to audio through the Meridian loudspeakers. In such systems, if two of the differing types of zone are linked so that they play material simultaneously, the delay on the Meridian DSP loudspeakers may be noticeable if the listener is positioned where they are able to hear sound from more than one zone type. Having the analogue-speaker zones fed by 251s allows LipSync to be used to add delay to align the sound in these zones to the sound from the Meridian loudspeaker zones.
The trigger can be configured to go high (12V) or low (0V) on a source-by-source basis. The socket accepts a mono 3.5 mm jack plug with the tip as the positive connection and screen as ground.
There are several methods for controlling the 251. It can be controlled via its network connection. The Meridian iPad app "IP Control" (available from the Apple App Store) provides access to all relevant functions. Third-party control-systems can control the product via its Automation Protocol. The 251 can also be controlled via infra-red if used in conjunction with an infra-red receiver device such as the Meridian G12. When used in combination with certain Meridian products, the 251 can be controlled via the Meridian "comms" system.
Although the 251 has only one pair of line-level analogue output sockets, the output is capable of driving the inputs of more than one power amplifier in parallel - providing the amplifiers have conventional high-impedance inputs. For example, all eight channels on the Meridian 258 multi-channel amplifier can be fed from one 251 to provide sound for four pairs of speakers.
Once the relevant account has been created with the streaming service provider, the account details must be added to the System Settings within Sooloos. This can be done via the Sooloos webclient - accessed by browsing to the IP address of the Sooloos “Core”. Or, it can be done using either of the Control Mac, Control PC or TouchPC programs. It can also be done from any Sooloos Touchscreen product connected to the system. Once the account is added, streamed music can be selected using the Sooloos "Explore" function. If desired, streamed tracks and albums can be added to your collection so they are accessible for playback in the same way as music which is stored locally.
One possible explanation is that the 218 needs to have its IR reception enabled. This can be done via the 218 configuration web-page. Set “IR mode” to “Controller” and store the settings to the product. Note: if “IR mode” is set to “Auto”, infra-red reception will be enabled only after the unit has received a “Clear” command from the remote control via the IR receiver.
Driver modules exist that enable the product to be used with various control systems.
Modules for the following systems have been created by a third-party developer/partner. To make a request for these modules, click on the relevant link:
Modules for the following control systems are available directly from the suppliers below:
Meridian Product Range Insight