Professional Line Array Sound Reinforcement Solution for School Playgrounds

■II. LA1428NF / LA1428SF System Diagram for School Playground Application

Signal Processing Workflow:

The audio source signals are mixed through the CM16 mixer, then processed by the D6576 feedback suppressor to eliminate the risk of acoustic feedback. The signals are subsequently sent to two D6696 processors for EQ, delay, crossover, and matrix routing. The processed signals are distributed to PV Series power amplifiers for amplification, which then drive the loudspeakers for sound reinforcement.

Installation Rendering

■Equipment List & Solution Description

Note: This solution is for reference only. Please contact us for specific project requirements.

Application Advantages

●Four-Layer Coverage for Full-Field Sound

The main line arrays cover the middle and rear sections of the grandstand, while auxiliary speakers reinforce the front area, long-throw horn speakers cover the field, and stage monitors provide on-stage sound. This four-layer architecture minimizes acoustic blind spots and ensures comprehensive coverage.

●Long-Throw Line Source with Uniform Coverage

Eight full-range speakers are vertically coupled to form a cylindrical wavefront, achieving approximately 3 dB SPL attenuation per doubling of distance, significantly lower than the 6 dB attenuation of point sources. This enables uniform long-distance sound projection while minimizing SPL differences between near and far fields.

●All-Weather Protection for Outdoor Applications

The LA1428NF/SF and D6565F are professional weather-resistant models, while the D6079B features a fiberglass enclosure with UV resistance. The system is designed to withstand rain, direct sunlight, dust, and temperature fluctuations in outdoor environments.

●Versatile Applications for Multiple Scenarios

The system supports daily announcements, sports events, flag-raising ceremonies, and cultural performances, delivering high speech intelligibility and powerful musical dynamics. One integrated system meets the diverse audio needs of campus activities.

●DSPPA Quality for Stable, Reliable Performance

The entire system utilizes professional audio equipment from DSPPA—a National High-Tech Enterprise. Its products are widely used in venues such as stadiums, schools, and public squares, with quality proven through numerous projects.

■Plan Sketch

Centered on the DSPPA LA1428NF and LA1428SF professional line array speaker systems, this solution combines optimized acoustic design with precise power matching to deliver stable, clear, and uniform sound coverage for the school’s standard 400-meter track and field. Designed for all-weather outdoor operation, it meets the high-quality audio requirements of various campus events.

■III. Main Line Array System Configuration

MAIN LINE ARRAY SYSTEM · LA1428NF + LA1428SF

Max. SPL（Full Range Speaker）124 dB

Max. SPL（Subwoofer）131 dB

System Configuration

Per Array: 8 full-range speakers + 1 subwoofer

Number of Arrays: 2 arrays in total

Installation: Suspended above the canopy

Coverage: Middle and rear sections of the grandstand

Coupling: Vertical cylindrical wavefront

Line Array Acoustic Advantages

Eight full-range drivers are vertically arranged and work together to produce coherent sound wave superposition, forming a focused directional beam. With superior attenuation characteristics compared with point sources, the line array significantly reduces SPL loss over long distances, ensuring consistent sound coverage and uniform near-to-far field performance.

Single Array Configuration Diagram

18" Subwoofer：800W / 8Ω 、8"×2 + 1.75"×1：400W / 16Ω

Total Power per Array: 400 W × 8 + 800 W × 1 = 4000 W

■IV. Product Introduction_D6565F

D6565F · 350W PROFESSIONAL WATERPROOF CONFERENCE SPEAKER

●D6565F professional speakers are high-quality audio output devices specifically designed for large venues, ensuring clear, uniform, and high-fidelity audio effects through optimized acoustic design and advanced technology to meet various music and speech requirements.

■LA1428N / LA1428S Technical Parameters

Note: NF/SF are weather-resistant variants with the same core electro-acoustic specifications as the standard LA1428N / LA1428S models. Their enclosure protection is enhanced for outdoor applications. For final specifications, please refer to the official DSPPA datasheet.

■V. Product Introduction_D6079B

D6079B · 400W REMOTE HORN SPEAKER · LONG-THROW

●D6079B all-weather two-way horn speaker system features a fiberglass enclosure that is waterproof and UV-resistant, delivering clear sound quality, with its low-frequency unitutilizing a compression horn transducer for enhanced sound pressure level and extended transmission distance.

■V. Application Scenarios