Already experienced in the use of the scalable DXT 7000, contracts manager Simon McClelland and senior engineer, Gareth Lennon, were confident that an enhanced version of the Ravenhill solution would meet all evacuation protocols, and at the same time be sufficiently adaptable to work only in selected stands (or on a reduced volume basis) as required for lower attendance games such as Linfield home matches.
A Master control rack is stationed in the South stand, with further 42U satellite racks located in other three, linked via optical fibre for the entertainment PA system, and copper for the emergency mic to conform to EN54 norms. Each rack plays its own emergency announcement independently, at an SPL of 89dB(A). There is a Fireman’s mic in each of the stands on a local buss, and the entire signal path from fireman's microphone to loudspeaker lines is completely and automatically monitored against faults within the DXT 7000’s 8 x 80W matrix. Included in the coverage are the pre-existing speakers in the administrative offices in the main stand.
A commentary system for the hearing impaired is also provided via a line output from the RCF PA/VA and there are various XLR inputs for mixer plug-ins. Finally, the multi-zone paging mic is located in the master control room overlooking the pitch.
Explaining the design, Gerry McKeown, design Director, said, “We decided on a decentralised approach, and because of the requirement for a dynamic high end entertainment solution as part of the voice alarm system, we decided to put in a separate horn overlay system.” The main entertainment PA comprises 45 P6215 15in coaxial weatherproof 60° x 60° speakers which are IP55-rated, driven low impedance by RCF IPS 3700 amplifiers.
These are spaced in clusters of two along the lip of the stand roof. Positioned alongside, are pairs of the EN54-24 compliant overlay system comprising IP66-rated HD 21EN 30W ABS horns, co-located with each cluster. The exception to this pairing is the East stand where only single enclosures of each were required The horns immediately come into play in the event of a failure of the main system, providing seamless UPS.