To achieve 360-degree coverage and very high SPLs, Farasout Negar designed a system based on 16 Community RSH-462 exponential FocusedArray horn systems. Each voice-range RSH-462 utilises four Community M200 ferrofluid-cooled compression drivers mounted to a hand laminated, reinforced composite fibreglass horn-array with a 60 degree horizontal and 20 degree vertical coverage pattern. With a sensitivity of 117dB for 1W at 1 metre and a 750W program power handling capacity the RSH-462 provided the considerable SPL required.
Coverage was achieved by mounting four RSH-462 in each of the shrine's four minarets, at a height of 33m from the ground. Four Lab.gruppen C28:4 four-channel power amplifiers are used to drive the Community loudspeakers and system management is handled by an XTA DP446.
Although the loudspeakers are mounted in the minarets, they are open to the full environmental conditions of Kazmein, so their all-weather capability was another important consideration for Farasout Negar. The one-piece, non-metallic diaphragm of the RSH-462 faces forward, isolating the voice coil and magnetic structure of each driver from the environment, providing the exceptional resistance to the effects of humidity and dust needed.
Milad GhorbanNejad, commercial manager of Farasout Negar, commented, "We are very pleased with the sound levels, high intelligibility and coverage we have achieved with the RSH-462 loudspeakers and the combination of Community, Lab.gruppen and XTA has provided a system that ensures quality and long term reliability."
(Jim Evans)
