Electro-Voice loudspeakers fill Karbala Olympic Stadium in Iraq with superb sound
November 29, 2016
- APCO Electronics selected Electro-Voice loudspeakers and digital networking for new 30,000-seat Karbala Olympic Stadium
- Installation exceeds international football audio standards for coverage and intelligibility while providing musical fidelity in the multi-purpose facility
- Electro-Voice N8000 controllers are used to optimize the performance via IRIS-Net software
The primary system requirement was that the sound system would meet FIFA football standards, which require 92 percent direct coverage and high intelligibility, with a Speech Transmission Index (STI) of 0.50 or higher. The installed system exceeds those standards, delivering 95 percent coverage with an outstanding STI (Speech Transmission Index) rating of 0.80, indicating excellent speech clarity. Next to public address announcements, the system should also be used for voice alarm and evacuation purposes.
“Installation exceeds international football audio standards for coverage and intelligibility”
Using EASE simulation software, the APCO team developed a design based on the Electro-Voice EVH-1152 loudspeaker system, a two-way 15-inch horn-loaded design available in six dispersion patterns. For the specific grandstand angles at Karbala Olympic Stadium, APCO used 24-each of 60x40-degree and 90x90-degree coverage patterns. Paired together, this combination provides direct, full-range coverage to all seating locations, including the difficult corner areas. In addition, two EVH-1152 loudspeaker systems with 90x90-degree dispersion are deployed individually at either end of the field to deliver audio onto the playing surface as needed.
The entire sound system is networked together using Electro-Voice N8000 Dante-enabled DSP matrix controllers and powered by Electro-Voice CPS series amplifiers with RCM-810 remote control modules. The N8000 from Electro-Voice provides complete system routing and control via graphical user interface in IRIS-Net software. The main loudspeaker system is divided into four zones, each with its own N8000 from Electro-Voice and either three or four amplifiers, with the east side zones requiring and extra amplifier to feed the field speakers. All amplifiers are connected to their associated N8000 via a gigabit Ethernet switch to handle signal routing, with redundant connectivity to ensure a reliable digital network. A fifth N8000 is stationed in the stadium’s main control room, and acts as the master unit for the entire system, routing the audio to each of the four individual zones. APCO programmed the signal processing core to handle all required audio sources, including microphones, PC-based streaming audio, emergency notifications and scoreboard audio.
Karbala Olympic Stadium represents the largest Dante system that APCO Electronics has designed and installed. Thus, the feeling of accomplishment was strong when the APCO team finally heard the Iraq national anthem being played through the Electro-Voice system at the opening ceremonies. That feeling was reinforced shortly after the event when APCO received calls from the Minister of Youth and Sport, and from local broadcaster Ishtar Media, thanking them for the outstanding audio quality.
APCO Electronics: http://www.ap-iq.com/
24x EVH-1152D loudspeaker, 60x40-degree dispersion
26x EVH-1152D loudspeaker, 90x90-degree dispersion
5x N8000 digital signal processing matrix controller
14x CPS4.10 amplifier, Class D, 4-channel
14x RCM-810 IRIS-Net remote control module
6x ZX3-90W loudspeaker
3x CPS2.6-II installation amplifier
3x CPS2.4-II installation amplifier
4x RE2-N2/A handheld wireless microphone system
3x BPU2/A bodypack wireless system
3x RE92TX lavalier microphone, cardioid
2x PolarChoice Satellite 18 gooseneck podium mic
2x RE-2 wireless beltpacks for podium mics
1x APD4+AB active antenna splitter with power distribution