Mission Pro DML panel loudspeakers were used by Provoice with their proprietary Loop Drive technique secure network. There are four VA racks on the system - a Master and three slave units. These are connected via a secure network loop, which carries three audio paths and a data path. In the unlikely event of a network failure, each of the four racks is capable of working stand alone for emergency pre-recorded messages and live broadcasts. The Speaker Loop Drive system is highly secure and uses isolators every 10 loudspeakers on the loop. In the event of a single open circuit, no loss of coverage will be experienced as the amplifier signal is applied to both ends of the loop. In the event of a short circuit, the faulty section of the loop is isolated whilst still allowing speakers on either side to function. The isolation is cancelled automatically if the fault is removed. The system also employs 'hot standby automatic switching' to protect against amplifier failure. If an amplifier fault is detected, the output circuit is automatically routed to a standby amplifier.
Mission Pro developed both flush and surface mount versions of their DML (distributed mode loudspeaker) panels, to the specification set by Provoice, to meet the acoustic and aesthetic needs of the installation. The result was three units, which gave very favourable performance properties in this difficult acoustic environment. A total of 130 FS-C6 ceiling-mount and 37 FS2 Pro loudspeakers reinforced by 17 FS-4P bass units completed the installation. The performance of the DML units allowed the system design to provide high intelligibility with an even sound coverage further than is possible with traditional piston type loudspeakers. This reduced the quantity of loudspeakers required in the Mall area, which additionally pleased the Architect.
Commenting on the installation, Mission Pro's director of sales and marketing, Steve Jordan said: "It has been a real pleasure working with the professionalism of Provoice. The system meets the aesthetic and acoustic demands of this prestigious installation and provides a solution with Mission Pro's advanced technology which could not be matched with conventional cone loudspeakers."
(Lee Baldock)
