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Home ApplicationsEducation & Training LA1428NF / LA1428SF Professional Line Array Sound Reinforcement Solution for School Playgrounds
Overview Key Highlights Related Product List More Commercial Solutions


Professional Line Array Sound Reinforcement Solution for School Playgrounds


 I. Solution Overview



The school's sports ground includes a standard 400-meter running track, a natural grass football pitch, and a covered spectator stand on its eastern side. The venue measures roughly 170 meters in length and 90 meters in width, and can hold thousands of people for large assemblies. It also needs to support a wide range of sound reinforcement applications at the same time, including routine announcements, athletic competitions, flag-raising ceremonies, and cultural performances.



Sound Reinforcement Challenges

● Extensive Coverage Zone: With an open area measuring 170 m × 90 m, a distributed sound system is needed to ensure even coverage across the entire field.

● SPL Disparity Between Front and Back: The venue's substantial depth results in notable differences in sound pressure levels, so supplementary speakers are required to boost sound in the rear section.

● Outdoor Use in All Weather Conditions: The equipment must have a high ingress protection rating to endure rain, prolonged sun exposure, dust, and temperature swings.

● Varied Usage Scenarios: Routine announcements, sports competitions, flag-raising ceremonies, and cultural performances each place different demands on the sound reinforcement system.

● Superior Speech Clarity: Announcements and national anthem playback call for excellent speech intelligibility, with reverberation kept under control.


 II. LA1428NF / LA1428SF System Diagram for School Playground Application



Signal Processing Workflow:


Audio source signals are combined via the CM16 mixer and then routed through the D6576 feedback suppressor to prevent any risk of acoustic feedback. From there, the signals go to two D6696 processors, where equalization, delay, crossover, and matrix routing are applied. The processed outputs are then fed to PV Series power amplifiers for amplification before driving the loudspeakers to deliver the sound reinforcement.



Installation Rendering


 Equipment List & Solution Description


No.

Model

Product Name

Quantity

SOUND System

1

LA1428NF

400W Passive Waterproof Array Full Range Speaker (1 PCS)

16PCS

2

PV2150

2x1400W  Professional Stereo Class-D Amplifier

4PCS

3

LA1428SF

Passive Waterproof Line Array Subwoofer

2PCS

4

PV2150

2x1400W  Professional Stereo Class-D Amplifier

1PC

5

D6565F

12" Outdoor Two-way Full Range Speaker

14PCS

6

PV2065

2x650W Professional Stereo Class-D Amplifier

7PCS

7

D6079B

15" Remote Horn Speaker

8PCS

8

PV2065

2x650W Professional Stereo Class-D Amplifier

4PCS

9

LA1428D

Installation Bracket for LA1428 & LA1428S

2PCS

10

LA142N

2M Nylon Webbing Sling for Bearing 2 Tons

4PCS

11

LA142K

22 Shackle for Bearing 2 Tons

8PCS

12

LA142H

6M Chain Hoist for Bearing 3 Tons

2PCS

13

D6576

Automatic Feedback Suppressor

1PC

14

D6696

16x16 Professional Audio Processor

2PCS

15

CM16

16 Channels Digital Mixing Console

1PC

16

D6558

Desktop Condenser Microphone

1PC

17

D5841

True Diversity UHF Wireless Microphone System (4 hand-held mic)

2PCS

18

D5828

8 Channels Outdoor Antenna Signal Amplification

1PC

19

D6721S

Sequence Controller

2PCS


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


Application Advantages

● Four-Tier Coverage for Complete Field Sound
The primary line arrays handle the middle and rear portions of the grandstand, while auxiliary speakers bolster the front section, long-throw horn speakers cover the playing field, and stage monitors supply sound on stage. This four-tier layout reduces acoustic dead zones and delivers thorough coverage.

● Long-Throw Line Source with Even Coverage
Eight full-range speakers are stacked vertically to create a cylindrical wavefront, producing roughly 3 dB SPL loss per doubling of distance—far less than the 6 dB loss typical of point sources. This allows consistent long-distance projection while reducing SPL differences between near and far areas.

● Weatherproof Design for Outdoor Use
The LA1428NF/SF and D6565F are professional weather-resistant models, and the D6079B uses a fiberglass enclosure with UV protection. The system is built to endure rain, prolonged sun exposure, dust, and temperature swings in outdoor settings.

● Flexible Support for Various Events
The system handles routine announcements, sports competitions, flag-raising ceremonies, and cultural performances, offering strong speech intelligibility and dynamic music reproduction. A single integrated system satisfies the wide-ranging audio requirements of campus activities.

● DSPPA Quality for Dependable, Consistent Performance
The whole system is built with professional audio equipment from DSPPA—a National High-Tech Enterprise. Its products are extensively deployed in stadiums, schools, public squares, and similar venues, with reliability demonstrated across countless projects.

 Plan Sketch



Built around the DSPPA LA1428NF and LA1428SF professional line array speaker systems, this solution integrates optimized acoustic design with precise power matching to provide stable, clear, and even sound coverage across the school's standard 400-meter track and field. Engineered for all-weather outdoor use, it satisfies the high-quality audio demands of a wide range of campus events.


 III. Main Line Array System Configuration

MAIN LINE ARRAY SYSTEM · LA1428NF + LA1428SF



 IV. Product Introduction_D6565F

D6565F · 350W PROFESSIONAL WATERPROOF CONFERENCE SPEAKER



 LA1428N / LA1428S Technical Parameters



Model

LA1428N

Drive Unit

8" Bass×2, 1.75” Treble×1

Frequency Response

70Hz-20kHz

Speaker Sensitivity (1m, 1W)

98±2dB

Max.SPL

124+2dB

Rated Power

400W (AES)

Rated Impedance

16Ω

Directivity (HxV)

120°x20°

Color

Black

Dimension

643mm×385mm×232mm

Net Weight

16kg



Model

LA1428N

Drive Unit

18" Bassx1

Frequency Response

35Hz-250Hz

Speaker Sensitivity (1m, 1W)

102±2dB

Max.SPL

131±2dB

Rated Power

800W

Rated Impedance

8Ω

Color

Black

Dimension

642mm×620mm×489mm

Net Weight

46kg


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



The D6079B is an all-weather two-way horn speaker system housed in a waterproof, UV-resistant fiberglass enclosure that delivers clear sound quality. Its low-frequency unit employs a compression horn transducer, which enhances sound pressure level and extends transmission distance.

 Application Scenarios

List of Products Related to the Above Solution

75Hz-20KHz (±3dB), 30Hz-200Hz (±3dB)

Professional Active Line Array Loudspeaker System

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35Hz-20KHz(±3dB)

Professional Waterproof Active Line Array Loudspeaker-System

DSP1280F

35Hz-20KHz(±3dB)

Professional Active Line Array Loudspeaker System

DSP1280

Latest Commercial Solutions

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