Gymnasium Public Address System Design Plan

I. System Architecture Design

Partition Coverage Scheme

• Large Areas (Competition Zones, Audience Seating): Deploy 60W-120W high-power column speakers to ensure a sound pressure level of ≥105dB (125Hz-4000Hz), meeting the amplification needs of stadiums accommodating 12,000 people.

• Small Areas (Corridors, Lounges): Use 20W ceiling speakers to balance aesthetics and sound quality.

• Zone Control: Implement an IP network broadcasting system for independent zone control, supporting scheduled playback of background music, closure notices, and emergency broadcasts.

Equipment Selection Requirements

• Speakers: Prioritize brands like JBL and MeyerSound for line array speakers, with individual output power ≥500W and coverage radius up to 120 meters.

• Amplifiers: Use QSC or Crown digital amplifiers with power ≥1000W to ensure stable operation under high loads.

• Audio Processing: Equip with digital audio matrix processors (e.g., DBX DriveRack PA+) supporting automatic equalization, feedback suppression, and delay adjustment.

II. Core Function Implementation

Multi-scenario Applications

• Background Music: Use TUMS integrated machines or NBS network broadcasting servers to set up scheduled tasks for playing different music in various areas at different times.

• Event Commentary: Pair wireless microphones with preamplifiers to support mixing outputs and multi-source priority control.

• Fire Linkage: Integrate with fire alarm hosts to automatically trigger broadcast alerts and initiate evacuation instructions in case of fire.

Intelligent Control System

• Network Paging Microphones: Deploy for whole-area/zone announcements and voice broadcasts.

• Remote Control via Luna Cloud Platform: Supports remote control, compatible with AirPlay wireless transmission, and adapts to Android/iOS devices.

III. Acoustic Optimization Measures

Acoustic Field Design

• Competition Hall Reverberation Time: Control according to JGJ/T131-2000 standards: ≤1.69 seconds at 125Hz, ≤1.3 seconds at 2000Hz, ensuring speech intelligibility (STI>0.5).

• Echo and Sound Concentration Reduction: Use sound-absorbing materials (e.g., perforated sound-absorbing panels) and diffusers.

Noise Control

• System Noise: Maintain ≤NR30, prioritize low-noise amplifiers and speakers during equipment selection.

• Feedback Suppression: Equip key areas (e.g., podium) with foldback speakers to avoid acoustic feedback interference.

IV. Implementation and Maintenance

Installation Standards

• Use CAT6 network cables mixed with fiber optics to ensure stable signal transmission.

• Match amplifier and speaker power, recommending a preamplifier + pure power amplifier mode.

Maintenance Strategy

• Monthly Checks: Inspect equipment status monthly and conduct regular sound pressure level tests and audio tuning.

• Fault Response Mechanism: Suppliers must provide 2-hour technical support and 24-hour repair services.

V. Cost Reference

• Initial Investment: Approximately 500,000 yuan (including speakers, amplifiers, control equipment).

• Annual Maintenance Cost: Includes equipment inspection, consumable replacement, etc. Recommend reserving a 10%-15% budget.

This solution achieves flexible expansion through an IP network architecture, is compatible with analog speakers for legacy use, and meets national first-class acoustic standards. It provides stadiums with a highly reliable, multi-scenario coverage broadcasting solution.