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Designing an audio-video system for a large multipurpose hall requires careful consideration of various factors to ensure optimal performance and user experience, in line with AVIXA (Audiovisual and Integrated Experience Association) standards. Here is a comprehensive guide covering audio acoustics, video brightness preferences, equipment selection, and other related points:
1-Audio Acoustics Considerations:
1.1 Room Acoustics Assessment:
-Evaluate the hall's dimensions, shape, and materials to understand its acoustic properties.
-Consider factors such as reverberation time, room modes, and potential sound reflections.
1.2 Sound Reinforcement System:
-Choose speakers with appropriate coverage patterns and power handling to accommodate the hall's size and layout.
-Position speakers strategically to ensure even coverage throughout the audience area.
-Consider line arrays for long-throw applications and distributed speaker systems for uniform coverage.
1.3 Acoustic Treatment:
-Install acoustic treatments such as absorptive panels, diffusers, and bass traps to control reverberation and improve speech intelligibility.
-Use acoustic modeling software to optimize treatment placement and ensure balanced sound distribution.
1.4 Feedback Control:
-Implement feedback suppression techniques such as notch filtering and automatic gain control to prevent audio feedback during live events.
-Utilize digital signal processing (DSP) tools to adjust EQ settings and optimize system performance.
2-Video Brightness Preferences:
2.1 Projection vs. LED Display:
Assess the hall's ambient light conditions and viewing distances to determine the most suitable display technology.
Choose high-brightness projectors for large-screen projections in well-lit environments, ensuring sufficient luminance and contrast.
Consider LED displays for venues with high ambient light levels or when seamless scalability and flexibility are required.
2.2 Screen Material and Reflectivity:
Select projection screens with appropriate gain characteristics to enhance brightness and contrast while maintaining wide viewing angles.
Consider ambient light rejection (ALR) screens to mitigate the impact of ambient light and improve image visibility.
Install motorized curtains or blinds to control ambient light levels and minimize glare during presentations.
3-Equipment Selection:
3.1 Speaker Placement:
Determine whether ceiling-mounted or wall-mounted speakers are more suitable based on the hall's architecture and aesthetic requirements.
Choose speakers with wide dispersion angles to ensure uniform coverage and minimize dead zones.
3.2 Acoustic Treatment:
Incorporate acoustic treatments such as sound-absorbing panels and diffusers to reduce reflections and improve sound clarity.
Ensure that treatments are strategically placed to address specific acoustic issues and enhance the overall listening experience.
3.3 Standards Compliance:
Adhere to relevant AVIXA standards and guidelines for audio-video system design, including ANSI/INFOCOMM standards for audio coverage and clarity.
Consider industry best practices and recommendations when selecting equipment and implementing system configurations.
4-Control Room Location:
Select an optimal location for the control room that allows for efficient operation and maintenance of the AV system.
Consider proximity to the main hall for easy access and communication with event organizers and technicians.
Ensure sufficient space for equipment racks, consoles, and seating for operators.
Evaluate environmental factors such as temperature, humidity, and noise levels to create a comfortable and functional workspace.
Plan for adequate ventilation and access to power and network infrastructure to support AV equipment and control systems.
5-Broadcast Cables and OBVAN Connection:
5.1 Cable Types and Quantities:
Determine the types and quantities of broadcast cables required to support audio and video signals throughout the multipurpose hall.
Select high-quality cables with appropriate shielding and connectors to minimize signal loss and interference.
Consider the specific requirements of each signal type, such as HDMI, SDI, analog audio, and Ethernet.
5.2 Cable Routing and Conduits:
Install cable conduits and pathways to facilitate organized and efficient cable routing throughout the hall.
Separate audio, video, and data cables to minimize interference and ensure signal integrity.
Consider future expansion and flexibility by incorporating spare conduits or cable runs for additional equipment or upgrades.
5.3 OBVAN Connection:
Establish a connection between the multipurpose hall and the outside broadcast van (OBVAN) for live broadcasting and recording purposes.
Use appropriate broadcast cables, such as fiber optic or high-quality coaxial cables, to transmit audio, video, and data signals between the MPH and OBVAN.
Ensure that the cables are properly terminated with suitable connectors at both ends for reliable and high-quality transmission.
5.4 Labeling and Documentation:
Clearly label all cables and connections to simplify troubleshooting and maintenance tasks.
Create a comprehensive documentation system that includes cable types, lengths, routing paths, and connection diagrams.
This documentation will be helpful for future reference, system upgrades, and troubleshooting.
5.5 OBVAN Connectivity and Control:
Determine the necessary connectivity between the OBVAN and the control room in the multipurpose hall.
Install appropriate interfaces, such as fiber optic or Ethernet connections, to allow seamless transmission of audio, video, and control signals (SDI, SMPTE, Fiber, Triax, Coaxial, Analog Audio Cables).
Set up control protocols, such as RS-232 or IP-based control, to enable remote control of OBVAN equipment from the MPH control room (Optional )
5.6 OBVAN Interface and Patching:
Establish a patching system that allows easy and flexible routing of signals between the OBVAN and the multipurpose hall.
Use patch panels or patch bays to simplify signal routing and facilitate quick changes during live events.
Label patch points clearly to ensure efficient and error-free signal routing.
6-Interpretation Booth Location:
Identify a strategic location within the hall that provides clear sightlines to the stage or presenter area.
Ensure accessibility for interpreters and technicians while minimizing distractions and disruptions during events.
Consider proximity to audiovisual equipment, such as microphones and monitors, to facilitate seamless communication and monitoring.
Evaluate acoustics and ambient noise levels to create a conducive environment for interpreters to work effectively.
Install soundproofing materials or enclosures to minimize sound leakage and maintain privacy within the interpretation booth.
7-Antenna Placement for Best Coverage:
Conduct a site survey to determine optimal locations for antennas based on signal propagation and coverage requirements.
Position antennas at elevated points to maximize line-of-sight coverage and minimize interference from obstacles.
Consider the hall's layout and architecture when placing antennas to ensure uniform signal distribution throughout the venue.
Install multiple antennas strategically to create overlapping coverage areas and mitigate signal dead zones.
Use directional antennas for long-range coverage and omnidirectional antennas for broader coverage in multi-directional environments.
8-IR Antenna Placement for Interpretation Systems:
Install IR transmitter and receiver antennas in locations that provide unobstructed line-of-sight communication between transmitters and receivers.
Position transmitter antennas near the stage or presenter area to ensure clear transmission of audio signals to interpretation receivers.
Place receiver antennas in close proximity to interpretation booths and audience seating areas for optimal reception and signal quality.
Consider installing additional IR antennas to cover large or irregularly shaped venues, ensuring consistent signal coverage and reliability.
Avoid placing IR antennas near sources of interference such as lighting fixtures or electronic equipment to minimize signal degradation and dropout.
By considering these factors and following industry best practices, you can design an effective audio-video system for a large multipurpose hall that provides an immersive and engaging experience for users, while meeting AVIXA standards.
With over 20 years of experience in the AV and ELV industries, I specialize in AV system design, installation, management, and integration across diverse sectors, including corporate, education, sports, healthcare, hospitality, and government. My career began in 2003 with the AV team at a 5-star hotel in Lebanon, where I developed a passion for AV systems.
I hold certifications as a Project Management Professional (PMP) from PMI, as well as CTS-D and CTS-I from AVIXA, blending technical expertise with strong project leadership. I have extensive experience deploying technologies from leading manufacturers such as Crestron, Extron, Biamp, and many others, while managing vendors and ensuring seamless integration.
Currently, I am part of BLINQ, a division of IMAR Trading and Contracting in Qatar, where I serve as the ELV Projects Manager, focusing on ELV systems and immersive AV solutions. I am committed to continuous learning, staying ahead of industry trends, and mentoring emerging professionals to elevate the AV field
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